Pro circuit jetting yz125 I What’s everyone doing for jetting on 2022/2023 yz125? I’m around 500ft above sea level. The pro circuit jetting chart is a great baseline to use. What makes the Boyesen Rad Valve design superior to stock or other aftermarket intake tract reed valve systems? Each Pro Circuit had produced this stamped and welded pipe and silencer combination for the Yamaha YZ250 from 2003 to 2015. If you hover the mouse pointer over a cell with a red corner then a message will pop up telling you about that cell. The slightly longer body offers reduced noise output when compared to the R-304. Thanks for any info. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Jul 9, 2025 · Whether you're racing motocross or enduro riding, this list covers the best YZ125 mods to make your dirt bike faster, safer, and more comfortable. Pro Circuit 2 Stroke Platinum Pipe for Yamaha YZ125X & YZ125 2 Strokes The Platinum Pipe offers the same performance gains as the popular Works Pipe, but utilizes a platinum plating on the body to protect it from everyday elements. . Mar 14, 2022 · MXA’S RECOMMENDED JETTING SPECS Main Jet: 410 Pilot Jet: 40 Needle: 6BFY42-74 Clip: Third from top Air screw: 2-1/4 turns out Note: Yamaha delivers every YZ125 with an optional 6BFY43-79 needle. I bought it from craigslist and then added a free flow air filter which i think made it leaner and now im going to put on a pro circuit pipe and silencer. Shop Pro Circuit Exhaust Systems for Yamaha YZ125 with eBay Guaranteed Fit. Aug 9, 2023 · On our built-out YZ125 race bike, Schnikey used a 62 pilot, 165 main jet and a Yamaha Y3 needle, which can be bought through Pro Circuit, in the third clip position. Yamaha Engine Mods Every engine we build or rebuild will be tested on the dyno. Is the y4 needle the same as the y3 just updated part #? Been waiting for pro circuit to get them back in but they haven’t yet. 62 pilot 165 main Y4 needle in the 2nd clip pos. I am installing a boyesen rad valve and moose torque spacer kit. May 8, 2002 · on my 2000 yz125 i run a pro-circuit pipe and my jetting is stock since the day i bought it 2 years ago and i been using BR9EG plugsin my yz since i bought it it seems tro run fine, although i had a couple of bad plugs that i bought thats NGK's fault Nov 18, 2021 · The fine-tuning is still up to you, but YZ250 jetting has stayed the same for years, so it isn’t hard to get dialed in. Taken off a running 2001 Yamaha YZ 125 Dirtbike. Thanks in advance. Aug 2, 2024 · The changes to Pro Taper bars (2007), stiffer forks springs (2008), lighter brake hose clamp (2009), longer silencer (2011), richer jetting (2011) and a white rear fender (2013) are not a ton of Feb 3, 2006 · FMF fatty vs. Dec 3, 2018 · Hello fellas. It claims an increase in horsepower and torque throughout the RPM range. im concerned about running it too lean for the break in. The stock jetting is a little rich (nothing horrible) as we got a little bog off faces of jumps so we decided to try Pro Circuit’s jetting spec an just altered it a little for sea level to 4000 feet. Get found on searches and enhance your vehicle with the best Aug 3, 2014 · I am looking to buy a new or like new FMF or Pro Circuit pipe and silencer combo for my 2005 Yamaha YZ-125. If i switched to fmf with a spark arrestor and/or fmf shorty would i need to re jet again? Or if i switched to fmf shorty and fmf fatty pipe would i need to re jet if im already jetted for the pro circuit shorty? Thanks! For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. Put a new wiseco piston in it just to get the stock one out and everything was perfect in the top end. May 14, 2023 · This jetting from pro circuit is at 1500 ft elevation, with c12 race fuel and 32:1 maxima 927. I changed the jetting to a 2 weeks ago and it ran great. Jan 5, 2010 · If You call Pro Circuit they will tell you their jetting is for race gas and pump gas will require richer jetting as race gas tends to help with detonation. Pro circuit website recomends Apr 22, 2022 · And, given that Yamaha had purchased two Pro Circuit-built Ryan Villopoto Replica YZ125 engines, we assumed that having the 38. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Oct 21, 2023 · This Pro Circuit-built 2023 Yamaha YZ125 is the new version of Pro Circuit’s “Race Spec” engine and suspension for this bike, and we were the lucky ones who were able to test it. I’m pretty sure they use California and sea level as their base but you could start there and lean it out for your elevation. May 26, 2016 · Recently bought 2016 yz 125 model, brand new, right out of the crate. i have a jetting question for a 2013 yz 125. 5 years of suffering bad jetting (stock bike from Suzuki factory) I finally got the jetting spot on thru the whole throttle range, something few bikes have. Oct 13, 2017 · Hey need some help on what jetting kit or what jets are needed to get this bike running good, 04 Yz 125 clean bike, good compression, runs alright with a new plug, and after a day at the track go to start it the next day won't start, happens every time. Precision in design and engineering makes even the smallest details into a work of art. With the stock pipe and reeds, stock jetting was very good (410 main Manufactured by N-Style, the Yamaha Graphic Kit from Pro Circuit offers riders a cool, fresh new look for the 2013 racing year. On our built-out YZ125 race bike, Schnikey used a 62 pilot, 165 main jet and a Yamaha Y3 needle, which can be bought through Pro Circuit, in the third clip position. Please remember that sometimes the stock OEM jetting will work just fine, other times you may have to make an adjustment, so use our suggestions below as a guide to help with your jetting problem. The R-304 silencer was developed as a full race two-stroke silencer. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Jun 5, 2013 · Hello I have a 2001 yz 125 and I think it is running to lean and I would like to jet it. These are recommendations only, based upon our testing at sea-level atmospheric pressure, a 65-80F degree ambient air temperature, a 32:1 fuel to oil mixing ratio 304 Silencers/Yamaha,The 304 silencer is recommended for most two-stroke applications. Yamaha Platinum Pipe,The Platinum Pipe has the same shaped cone sections as the popular Works Pipe, but utilizes plating on the body to protect it from everyday elements. Those motors were the same for a long time so Jul 18, 2022 · The best solution for this bike, at least with the stock #7 slide, is to buy the GYTR jetting kit with the Y4 needle and use Pro Circuit's new spec. Don't settle for subpar exhaust components - choose Pro Circuit for the ultimate upgrade. Pro Circuit Product, Inc. Apr 1, 2008 · I have an 06 YZ125 also. These are recommendations only, based upon our testing at sea-level atmospheric pressure, a 65-80F degree ambient air temperature, a 32:1 fuel to oil mixing ratio Yamaha Platinum Pipe,The Platinum Pipe has the same shaped cone sections as the popular Works Pipe, but utilizes plating on the body to protect it from everyday elements. We would like to show you a description here but the site won’t allow us. I would appreciate any info, feedback, and reviews on these products. This sleek three-piece kit is CNC-machined from tough, aircraft-grade aluminum, anodized in a striking blue, and hand-polished for a premium For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. The setting is 165 main, 62 Pilot, and Y3 needle in the 3rd clip. The Ti-2 Shorty Carbon Kevlar/Titanium Silencer is the latest piece of racing technology offered by Pro Circuit. 32 horsepower engines in house would give them a worthy target to May 4, 2021 · I bought a 17’ yz125 with a fmf gold series fatty and powercore 2, I’ve never touched any of the jetting but would like to know if it could possibly run better if I had the proper jetting. Aug 9, 2010 · HGS with Pro Circuit 304 muffler, best combo I've tried. May 27, 2006 · 01 yz125 jetting and oil ??? i have a pro circuit pipe with silencer,no-toil filter. six93motocycles · Original audio Jul 2, 2025 · Platinum Pipe - 2-Stroke for 01-02 Yamaha YZ125. Pro Circuit. Feb 18, 2021 · Notes: On our full-race Pro Circuit-built Ryan Villopoto replica YZ125, we ran a 470 main with MRX02 fuel. With a new top end, plug, and full carb service and stock jetting, I'm hoping that I'll be in the right area then. Making another Loretta's push this year and trying to decide between the two companies. Jan 30, 2020 · Pro Circuit Works Pipe/R-304 Silencer (Kris’s Breakdown): The Pro Circuit Works Pipe and R-304 silencer has a deeper sound than the FMF/stock system and gives the YZ125 more bottom end than the FMF. Stock needle in the 2-3rd clip position. Rich condition. com Dec 22, 2023 · After GYTR jetting and the APEX SX dome the bike will have lots of bottom end and responsiveness, you may be able to drop a tooth on the rear. The color, quantity, size, etc. 70 power jet The GYTR kit comes with the 70 power jet. Mar 29, 2020 · The Pro Circuit Works Pipe and R-304 silencer has a deeper sound than the FMF/stock system and gives the YZ125 more bottom end than the FMF. While still at Yamaha, I got the chance to ride that engine spec myself, even throwing a leg over a cylinder hand-ported by Yamaha Works Pipe,The original Pro Circuit Works Pipe offers unparalled performance and power for every two-stroke application. Material : Steel. It’s a ‘21 I bought brand new this summer so the jetting is stock on it now. Dec 25, 2007 · I have a 98 YZ 250 w/ Pro circuit platinum pipe and scilencer and need to know if someone has the proper jetting specs for this setup? Thank you if you have For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. 125s need to be up in the revs to make power. Jul 26, 2015 · If you go on the pro circuit website they have jetting recommendations for almost all two strokes. The top end signs Two stroke dirt bike jetting experts, Mitch Payton and Schnike from Pro Circuit Racing, jetted the 1999 KX250 Splitfire Build. Oct 29, 2025 · MPN: PY01125P YAMAHA YZ125 2001-2002 Looking for high-quality Pro Circuit Platinum Exhaust Pipe Parts? Look no further than the 792-5003P! Designed for maximum performance and durability, these parts are sure to take your ride to the next level. Granted, kind of the crux of the video is that the new YZ felt slower as Yamaha's stock jetting on the new Keihin seems a little dicey. Jun 24, 2022 · 2015 yz125 jetted for pro circuit r304 shorty with stock pipe. Massive selection from top brands on eBay. She is definitely running rich, and would like to get her more crispy like the 2014 she replaced. Mxa magazine says that if you put aftermarket Pipe, you need to go up on a main jet from 430 to 440. I was thinking either a Pro Circuit/R304 silencer or an FMF Factory Fatty/Shorty silencer. Free Shipping on orders over $50. I was provided the bike to test after Kris had done some jetting modifications to the carburetor (raised needle to 2nd position). After 1. But keep in mind we have almost zero humidity. But he said he couldn't really tell a difference between the YZ's? Oct 4, 2024 · Hi all, does anyone have experience with the JD jet kit and/or the GYTR jet kit in a '23/'24 YZ125X? As we know, the jetting is horrible on these bikes stock. We are an authorized dealer for Pro Circuit. Check it out! Apr 2, 2008 · Hey guys, can someone please help me with the jetting specs for a 2006 yz125 which has the PC platinum pipe and a r304 shorty. Proudly made in USA. I just did a top end on it. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. I ride in AZ usually from 2500-5000 feet. None other than Ryan Villopoto—the greatest retired rider of all time—lined up aboard a Pro Circuit–built YZ125 and put in some impressive performances. Enter all the data in the light blue data boxes for the program to automatically display the jetting results in a graph. Edited May 1, 2015 by mlatour Sep 12, 2025 · Part Number PY01125P. Does anyone run this exhaust? Whats your thoughts? I think our jetting maybe slightly rich which is making the noise a little worse? What jetting specs a Jan 15, 2013 · Trying to decide which direction to go with my sons 24' YZ125 race bike. 1:11 YZ125 Pro Circuit Pipe, 0. The PC pipe/silencer has increased pulling power out of corners (mid-range) and just feels like it’s more torquey. Apr 1, 2008 · Hey guys, I've installed a Athena 144 kit on my 2014 YZ125 and am struggling with jetting. Thank you Works Pipe,The original Pro Circuit Works Pipe offers unparalleled performance and power for every two-stroke application. I've ordered a full carb service kit that has the stock 178 main and 50 pilot in it. There are no two better people in the entire planet to do so. When rolling the throttle on you’re able just to feel more meat as you’re able to shift the YZ125 a little sooner. May 4, 2020 · Race Shop Build: 2020 Pro Circuit Yamaha YZ125 1 A Yamaha YZ125 is a great bike to have in general but when you add Ryan Villopoto's exact cylinder and head from his 125 All-Star race bike, it gives an entirely new meaning to "project bike". For four-stroke bikes, our jetting specs are for premium pump gas at 0-1500 ft altitude at 70-85 degrees temperature. The Platinum Pipe is a unique fusion of power, elegance and utility that pushes the boundaries of the sport’s riding pleasure For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. Please Note: The stock OEM jetting for your specific model is listed first, followed by our recommended jetting underneath that model. Pro circuit By Fox_Racing February 3, 2006 in Jetting & Exhaust Forum Jul 29, 2023 · I just stumbled across the AJ / Moto Academy video of him riding a '22 125 SX, '20 YZ 125 and a '22 new generation YZ 125. I am curious if anyone knows the proper jetting a should run with this set up to get the best power out of this set up. The Platinum Pipe is a unique fusion of power, elegance and utility that pushes the boundaries of the sport's riding pleasure. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Pro Circuit Product, Inc. com Description James Dean purpose-built this jetting kit for riders looking to improve running performance and throttle response throughout the RPM range. Sale is for the exact pipe pictured. You need to properly jet your bike. Yamaha YZ125 Jetting + 30 Pro Setup Tips & Discount Codes to Save Money & Go Fast! Ryder Sigety 4. Mar 9, 2022 · But, since the standard-issue Pro Circuit YZ125 pipe does not fit on the 2022 Yamaha YZ125, Pro Circuit had to design a new YZ125 pipe. Bare Bones Bones Answers Sought-After Suspension questions 2017 KTM and Husqvarna Two-Stroke Pipe Mounting 2017 KTM and Husqvarna Two-Stroke Mounting Tab Instructions (PDF) Jetting Specifications Yamaha Platinum Pipe,The Platinum Pipe has the same shaped cone sections as the popular Works Pipe, but utilizes plating on the body to protect it from everyday elements. 24 Yamaha manuals still call for 72-75 pilot with 160-165 main, just leaner and richer straight portions on the needle for winter and summer. I was wondering if a PC shorty would give Pro circuit has jetting recommendations on their website, iirc they include jetting for mods Sep 9, 2013 · i run the pro circuit jetting, and it runs spot on for me, i only live about 20 miles from you buddy (crewe cheshire) so sea level and temps are about the same, im a fair weather rider now a days due to age, but when i bought my bike new, its a 2003 yz 125 i started with motul 800 at the recommended manual amount, and it drooled like yours but Jul 9, 2025 · If you want to stick with FMF or Pro Circuit, do some research on which pipe works well for your dirt bike, because not every pipe and bike combination will give you the same result. Q: WHAT IS THE COMMONSENSE APPROACH TO BUYING A YZ125? Mar 29, 2020 · The Pro Circuit Works Pipe and R-304 silencer has a deeper sound than the FMF/stock system and gives the YZ125 more bottom end than the FMF. 23K subscribers 372 If you recall, we were fortunate enough to ride a trick Pro Circuit Kawasaki KX450, last year, that was assembled for Ken Roczen. it seems like a big jump. I must say the bike was pretty spot on with jetting when I got it. Sep 4, 2025 · Precision in design and engineering makes even the smallest details into a work of art. I haven't taken off the carb yet but I will Pro Circuit Product, Inc. Jan 15, 2004 · I have an '01 yz125 that has a ProCircuit pipe on it with the stock silencer. I’m still waiting on pro circuit for the y4 needle, but May 6, 2025 · A few years ago, the Pro Motocross Series featured 125 All-Star races as a halftime show during select Nationals. 032" Squish Band Head, Spark Plug Test & Review @ Croom, Jetting good UpAllNight91 12. Currently a 175 main, 50 pilot, 2nd clip and full pro circuit pipe. The kit comes with instructions and charts that carefully walk through the installation process and offer guidance to help get peak performance at all elevations and in all conditions. For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. Pro circuit platinum system & some minor jetting changes to get this yz125 running crisp 👌 #yamaha #yz125 #dyno #mainline. My jetting skills suck but I'm willing to learn. 2021 YAMAHA YZ250 JETTING Main Jet: 178 Pilot Jet: 50 Needle: N3EW Oct 20, 2020 · Hi guys Just bought a full pro circuit exhaust system for my yz250 2020, just wanted to getting people thought on jetting with new exhaust I have heard you should go to a 180 main ? Cheers Feb 13, 2014 · So this will be the first time I’ve ever re-jetted my bike. Does the fmf Fatty and pro circuit require richer jetting as a rule or does the stock normally work well? Jun 23, 2025 · Please view all the images for condition and further detail. Here's how to use it. At the bottom of this page Mar 29, 2020 · The Pro Circuit Works Pipe and R-304 silencer has a deeper sound than the FMF/stock system and gives the YZ125 more bottom end than the FMF. i am in Australia, NSW. it’s got a pro circuit pipe and silencer. What is the best jetting setup? Also, does going leaner on the pilot make it hit better the bot Jun 28, 2016 · I have a 2000 kx125 stock with full pro circuit exhaust. Sep 7, 2005 · i have a yz125 and i got boyesen reeds and pro circuit pipe, and i need to know what carb jet changes i need. Yamaha Works Pipe,The original Pro Circuit Works Pipe offers unparalled performance and power for every two-stroke application. Hey Guys, My Brother and I are going up to Kennedy Meadows in a few weeks and I was wonder what the jetting spec are for 7,500 feet He has an 02 YZ125 with the Pro Circuit pipe and silencer Manufactured by N-Style, the Yamaha Graphic Kit from Pro Circuit offers riders a cool, fresh new look for the 2013 racing year. Well, thanks to our friend Todd Ford at Custom Upfits, we recently Jetting Mikuni TMS/TMX carburetors Below is a screenshot of my spreadsheet page for Mikuni TMS and TMX carbs. MAXIMUM POWER ACHIEVED THROUGH AIR INTAKE, ACCELERATION AND DISTRIBUTION. James Dean purpose-built this jetting kit for riders looking to improve running performance and throttle response throughout the RPM range. Pro Circuit’s R&D technician, Mike “Schnikey” Tomlin, spent hours dialing in the jetting and came up with Pro Circuit’s new OEM-spec YZ125 jet kit. the pro circuit The Ti-2 Shorty Carbon Kevlar/Titanium Silencer is the latest piece of racing technology offered by Pro Circuit. I am running stock engine, Boyesen Pro reeds, FMF factory fatty, FMF power core silencer (not the shorty). Jan 31, 2023 · i’ve got a 2020 yz125 it runs very bad it’s got a 460 main jet and 45 pilot. on the oil issue,, if you use gear oil Jun 18, 2024 · In stock form the 2024 YZ125 is a solid handling and performing bike. Navigation: Home » Motor Department » GYTR Jetting Kit Pro Circuit Product, Inc. More specifically I was wondering for myself with my yz125 with a full pro circuit system, what the power (HP) difference is. Piston looked new still, so no problems with detonation or lean spots. my bike is a yz250 2014 I want to get a new exhaust I’m looking at the pro circuit 304 with the pro circuit works pipe what type of jetting would I need I live in Michigan and ride bigger Apr 3, 2006 · Just wondering what you guys are running out there and what pipe(s) I should get for my new 125. May 31, 2013 · With MXA proclaiming the GYTR kit is the absolute best, Ping on the rooftops screaming about the PC engine he has (RV's 125 ride in 2019), how does one choose what direction to go in? Built with a Pro Circuit motor and Factory Connection suspension, this YZ125 can hang with 250 four-strokes! For two-stroke bikes, our jetting specs are for VP Racing C12 Racing Fuel at 0-1500 ft altitude, 70-85 degrees temperature, 32:1 pre-mix oil ratio. Pro Circuit makes this stamped and welded pipe and silencer combination for the Yamaha YZ125 from 2005 to the present. Aug 25, 2023 · That jetting was the ProCircuit setting referenced in MXA on their 2023 YZ125 ProCircuit race bike. anyone got any recommendations on what jets i should run? Nature Friendly Spark Arrestor/Yamaha,,Nature Friendly Spark Arrestors,procircuit. Great deals. Which is better? Pros and cons of both? Other mods on my bike are a pro circuit pipe and a shorty silencer. May 14, 2023 · I haven’t messed with the jetting since I’ve posted before I think I’m at 58-62 on the pilot and 165 on the main. I have tried just about everything with the jetting and have found combos that work really well for me. elevation is sea level. It was this way when I bought it. The Boyesen Rad Valve features a sophisticated array of performance attributes designed to provide peak horsepower gains, durability, and model-specific performance for each make/model/year machine. You’re a little big for it but nothing it can’t handle with proper throttle and clutch control. 35) today when you shop RevZilla for your Pro Circuit Platinum Pipe Yamaha YZ125 2001-2002! Free Shipping, Lowest Price Guaranteed & Top of the Line Expert Service. Add Vforces and a tidy up of the jetting and it's a good combo May 24, 2006 · All Activity Home Forums Dirt Bikes Make / Model Specific Yamaha Motorcycles Yamaha 2 Stroke need some help with 01 yz 125 Facebook Twitter Youtube Instagram Pinterest Newsletter Jul 7, 2023 · I’m curious to know what the power difference is from a stock exhaust system to a full aftermarket exhaust system on two stroke dirtbikes. Made from stamped AKDQ high-quality carbon steel with hand welded and pounded seams, it has reinforced mounting brackets and braced stinger. Help? 1,200 feet Pro circui Hi guys, I've just brought a full pro circuit works/shorty system and wondering if I need to change my jetting for it, I have stock jetting currently. may not be accurate. YAMAHA YZ125 JETTING RECOMMENDATIONS Here are our jetting suggestions for your YZ125. Save 5% ($15. I’m wanting to ride this weekend and it will be about 40-45 degrees. I’m in the Midwest so elevation won’t be an issue. Said they are still testing on the y4. R-304 Silencers/Yamaha,The R-304 silencer's compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing only. We recommend Maxima Castor 927 High Performance 2-Cycle Oil. Jul 18, 2022 · Years ago I had an unsolvable jetting problem and so I made a jetting calculator to help me get it jetted right. Pipe Description: The Platinum Pipe offers the same performance gains as the popular Works Pipe, but utilizes a platinum plating on the body to protect it from everyday elements. so i have no clue what i should pre-set my jetting to for the break-in. The Pro Circuit Support page is designed to give you on-line information on the various products we sell. We have developed a list of jetting specifications that we believe will help your bike run its very best. The bike is all stock and if the bike is missing one thing, that's throttle response, because the bike revvs Apr 30, 2015 · -use the stock jetting and carburator settings as per the service manual -premix at the recommended 32:1 -then fine tune the jetting for your riding conditions* *which would most likely be a leaner pilot jet for slow trails, and a richer main jet for your aftermarket Pro-Circuit pipe. The compact design of the short aluminum canister offers optimum performance gains and is recommended for closed-course racing. With the stock pipe and reeds, stock jetting was very good (410 main Shop official FMF Racing dirt bike & ATV mufflers and exhaust parts, exclusive apparel, t-shirts, hats, goggles, and sunglasses here. Oct 14, 2019 · Cheers for the replies. The compatibility section is not always 100% accurate. I rode on a tight, technical motocross track where corner speed and clutch abuse are everything, but I never had to touch the clutch on the 22. I'm at sea level. You have to get a 62 pilot separately. Since the purchase, I've recently replaced the stock with PC pipe, Ti-2 carbon silencer, Boyesen rad valve and power wing. 4K subscribers Subscribe Dec 18, 2014 · Going to be replacing the stock reed cage on my 21' yz125. The cost is about the same with both, with Lynk's being just slightly less. Mar 11, 2024 · We also got a jetting spec that we liked. Holeshot Heaven! Pro Circuit Works Pipe (RV Spec) for YZ125 (2005-2022) - PY05125-RV Tired of getting roosted by every Johnny-come-lately on a 125? This Pro Circuit Works Pipe, developed with multi-time champ Ryan Villopoto himself, is your ticket to holeshot glory! Bolt this bad boy onto your YZ125 and watch the competition disappear in a cloud of blue smoke (and maybe a little panic). Looking to improve the low to mid power. Thanks for any info! Apr 27, 2021 · So I have a 2007 yz125 with a full pro circuit exhaust system and jd jetting says I should run a 430 main jet for riding near sea level but pro circuit says I should use a 410 main jet but I’m scared Sep 4, 2022 · Hey guys, my son rides a 21 YZ 125, we have fitted a PC shorty silencer on it, I know they are designed to be louder but I dont like the sound. Feb 22, 2022 · I will also say I am perfectionist about jetting, my bikes always start with a few kicks cold or hot and have excellent throttle response no matter what the RPM. Can't quite clean up the midrange bog I get with stock jetting options so I ordered both a GYTR jet kit and a JD jet kit. I got to ride a 22 yz 125 yesterday and it is definitely an improvement over my 2009 yz 125. Apr 12, 2011 · Hi, I have a 2000 YZ 125 I was wandering what are some inexpensive mods I could do to get more bottom end? I already have the Pro Circuit muffler and fatty pipe. If you can somehow get your hands on a manual or ThumperTalk forum has a lot of jetting recommendations in the yz section. If the engine case is dirty, it will… Aug 10, 2020 · My 2005 YZ250 feels flat in the mid range since last week. i looked at pro circuit website and its says to go from a 460 main to 410. 1 month later Apr 22, 2009 · Hi, Can anyone share their jetting specs for a stock '07 YZ125 I'm switching to a Pro Circuit pipe & silencer with a Boyesen Rad Valve, at sea level, 60-75 deg F ? Thanks !! Aug 9, 2023 · On our built-out YZ125 race bike, Schnikey used a 62 pilot, 165 main jet and a Yamaha Y3 needle, which can be bought through Pro Circuit, in the third clip position. We’ve spent countless hours of testing to determine which settings work best when bolting on one of our pipes and silencers to a stock machine. can some put more light on this for me. the jetting right now is spot on, but what should i do if i went to new reeds and pipe i got a yz 125 and completely rebuilt everything before riding it because it tested really bad on the compression tester and antifreeze was in the oil. Jul 9, 2015 · Hello I’m new to two strokes and have some questions. Yamaha Engine Plug Kits in Stock CORONA, CA - May 7, 2025 - Looking to give your Yamaha that factory race-team style? Pro Circuit's Yamaha Engine Plug Kit is the perfect upgrade for your YZ250F (2014-2020) or YZ450F (2010-2020). Here are our jetting suggestions for your YZ125. © Copyright 2025 Pro Circuit Product, Inc. In doing this, the engine is properly broken in, and we make sure you are getting the performance you pay for.