Yz125x jetting chart Dec 28, 2021 · The Mikuni jetting chart below suggest that going from about sea level (250ft included) up to 3200ft requires approximately a 0. I’d like to run atleast a 50/50 mix of avgas or race gas mixed with pump. It runs very well with the stock Kawasaki jetting the only thing I have changed is the clip position. Any tips or suggestions would be great, thanks! current jetting: 170m. Then read it was maybe the jetting so got a jd jetting kit which was recommended by lots of people who have the new 22s. One is by taper starting position, or what most refer to as clip position. The jetting was very finicky for us. Dec 20, 2024 · As a comparative here's the 2010 YZ125 factory service manual jetting chart. *A note from the 2008 manual: changing from 6BFY42-74 to 6BFY43-74 has the same effect as a rising of 0. But we found the bike is jetted a little rich most specifically on the pilot and needle. This is a new top end with about 10 hours time on it. We're still fine tuning this new carb on the 2023 YZ125X (2022/2023 YZ125). 5 out that plug was white so I threw in a 430 and only change the screw half a turn in and it seems to runs fine went for about a 30 min ride mostly about 5-7k rp May 30, 2022 · the stock settings are: #40 pilot jet , 42-74 needle / 3rd clip, #410 main jet Your 43-74 needle suggest you may have a later model bike (2011-2021) with the long stock silencer. I just got a jd jetting kit and rebuilt the topend. As an example my YZ125 is 99% MX track ridden and responds best with richer settings that what any chart recommends. Also, I know it's a rich condition (checked plug and bogs in first gear). This version of the YZ125 is known to be lean on Jun 12, 2022 · put the jetting back to stock (Canada also) and raced the bike this weekend The bike does seem rich when sitting on the line and when warming it up but have no complaints when racing on the track. Also read that people have been moving more towards yz250 jetting standards to get this thing right. Jun 24, 2017 · I was wondering how to jet my 2014 yz125 for a altitude of 0-1000ft and a temp. The jd jetting was a step backwards by a lot. -If you will be racing or running in open desert conditions, richen each jet by one size and the need Mar 11, 2024 · The YZ125 is unchanged for 2024 but since we didn’t give you YZ125 owners any love in 2023 we are here for some suspension and jetting specs. Sep 24, 2021 · There is nothing magical with jetting 'kits', you'd get the same results experimenting with OEM/genuine jets. May 21, 2017 · Does anyone have some solid jetting specs for an 05+ YZ125 for Socal that they would share before I start throwing brass at it? It's decent off the factory floor but doesn't sound super crisp. of 80-100f. The 144 is much stronger than the 125. Mine did. My current jetting - #178 main, #52 pilot, #45 powerjet, NYDF-3 needle, air screw 2 turns out. I'm at 172M, 62P, NYCF-3, AS 1 3/4 out, 93 octane, 32:1 Amsoil Dominator, riding around sea level. The low and top end power seems good, but the midrange reall Feb 15, 2018 · So I was given a 94 yz125 that was locked up. Apr 1, 2008 · Jetting seems to be really good right off of the showroom floor. and, also benefit from running the float 1-2mm lower when slower paced trail/off-road riding. No matter what any chart suggest, specific conditions will always require fine tuning (daily if needed) 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 OEM cylinder head leaves a lot to be desired (see our FAQ), and it’s large squish clearance can lead to jetting woes, detonation, poor fuel economy and throttle response, and less power. Then we put jetting back to 2006-2010 jetting and I took bike out for a rip jetting was crisp and clean. I have been surprised how lean i have had to go on the pilot. I’ve read everywhere that it’s jetted rich from factory. The same goes for reeds that don't seal properly, and a silencer that needs re-packing. The suspension is still a little soft in stock trim, so if Feb 13, 2014 · So this will be the first time I’ve ever re-jetted my bike. Sep 30, 2023 · As far as jetting, I have a '23 and am riding around sea-level and up to your elevation. 5 pilot jet, # 43-74 needle / 3rd clip position, #420 main jet. Bike runs really, really good. I fouled plugs before the new top end and now Address 1930 Carpenter RD SE Lacey, WA 98503-2915 United States of America Phone: 360-350-0557 Email: tech@jdjetting. Aside from a few dollars worth of new jets, what you're paying for is for them to have done most of the experimenting for you. Mar 5, 2023 · I decided to get my yz125 out for the weekend for some funtimes. I struggled a bit at first with Jetting due to the whole144 change but it is a great experience when you dial it in and full power comes out. I ended up wit Jan 11, 2025 · Welcome to Apple Valley MX! 2023-2024 Yamaha YZ125X JD Jetting Jet Kit New JD Jetting Jet Kit for the 2023-2024 Yamaha YZ125X. Same thing when someone writes Motocross Action or whatever and asks the jetting question. JD Jetting kit vs DIY Nov 22, 2021 · 2022 YZ 125 Introduction By Matt Mattoon and Jimmy Lewis Photos By Trevor Hunter Yamaha has been making a YZ125 since— well, likely before you were born. Try it as-is but for your ambient temps and intended enduro usage, I would guess you will end up needing closer to #37. Instead of these setting being jumbled in general 2022 yz125 posts, I wanted to rea Mar 11, 2024 · The YZ125 is unchanged for 2024 but since we didn’t give you YZ125 owners any love in 2023 we are here for some suspension and jetting specs. Enjoy the video! Apr 23, 2018 · 2008 Jetting (USA model) Air Screw: 2-1/4 Turns (out from closed position) Slow Jet: #40 Needle: 6BFY42-74 (3rd clip position, from top) Main Jet: #430 My notes say the 2011+ needle is the 6BFY43-74. I am currently running the stock jets which are a 460 main and 32. Oct 26, 2020 · My jetting; My jetting closely approximates that of the 2018 KTM 150xcw. Although my JD jet chart only calls for a 175 at 6k+ feet. Since every plug I pulled out of the bike was black/wet I decided to go down a size. Same with the slide. Mar 20, 2002 · My brother-in-law has a 2001 yz 125 and his jetting is 25 pilot,460 main. Best running 125 I have ever tried. Fast Free Shipping!. Not to happy. I have easy access to Sunoco 112, 100LL AvGas or premium pump which in my area is kind of suspect. mxa retro test: we ride trey canard’s 2010 geico honda crf250 important gasgas news! all 2022-2025 gasgas off-road bike’s braktec brake systems recalled Feb 4, 2024 · Interesting that your kit didn't come with a 175. Added a FMF factory fatty and powercore silencer and it still runs great. Y4 needle in the 2nd clip pos. YZ125 Tuning / Jetting question - Tech Help/Race Shop - Motocross Forums / Message Boards - Vital MX Apr 23, 2020 · Main Jet – European Models: 380 – All Other Models: 350: Jet Needle – European Models: 6DHY56-75 – All Other Models: 6DHY53-75: Jet Needle Clip Position: Third (3rd) From The Top: Throttle Valve Cutout: 6. Oct 2, 2007 · I don't understand how those charts have any meaning at all when altitude and temperature aren't included. Right now I am at the second clip position on the needle. I bought the bike used and im assuming all the jets are stock. Jan 30, 2025 · Exceeds the performance of standard 2-stroke and 4-stroke jetting, and other factory needle options. May 31, 2019 · I can confidently say that no jetting setup will work well at both sea level, and 8000 feet. Stock settings may be too rich for your specific usage. I've read on other forums that the SST pipe makes the bike run hotter compared to other pipes and people recommended 100+ octane. Cleaned it, carb kit, float setting, JD jetting kit, very many jet changes, needle clip positions, - each thing that I did got it a bit better. 5 pilot because that is what it says to run. Jun 10, 2020 · As Dan mentions, the YZ125 and YZ125X stock jetting charts and suggestions are usually quite accurate and, great starting point to fine tune from. You can order this through ProCircuit but you will have to call, it’s not listed on their website. 2-1/4 turns out on the air screw The ignition mapping is different and the jetting is a touch leaner in most zones. I have noticed as the humidity has dropped the bike seems a little bit lean up top still. Manufacturer Part Numbers. The main jet is actually close for pump gas - but has room to go leaner for more power with race fuels. It is stock bore and i keep my air filters clean religiously. Oct 7, 2015 · winter: under 50°F : #42. Sep 22, 2023 · Plug type and heat range is really the very last thing you do once the other variables and the jetting has been fine-tuned. The motor ran very clean and crisp with improved throttle response, but only after a jetting change. 70 power jet The GYTR kit comes with the 70 power jet. Sep 16, 2017 · Hey guys I purchased my first ever 2 smoke yesterday and it will not start, guy I bought it from says it would never run right but has new top and bottom end so I believe it's a jetting/carb problem. 5 out Main Jet 340-350 Jun 15, 2019 · The 36mm pwk came off of a late 90’s I’d 125. I am going to try the following jetting out, maybe this weekend as I have a race next weekend. It shows the each progressive step on enriching the needle circuit by either needle clip position or different needle #'s. 75 out Main Jet 340-350 1997 Pilot Jet 45-50 Needle STOCK Clip Position 3RD Air Screw 1. ) Pilot Air Screw Stock Setting – European Models: 1-3/4 Turns James Dean designed this jetting kit for Yamaha riders looking to push their motorcycles to the next level. In your history, 2005 was the last major revision with an … Continued May 31, 2024 · Jetting spec for 2022 to ? YZ125The bike is super responsive at any throttle position. The bike starts and works perfectly, but it is running a little bit rich, and I worry that in the summer it will get even richer, so I decided to take a look at the jetting. 50p. I also don't know too much about jetting so any help would be appreciated. I actually called JD jetting earlier this week and explained to him exactly what I wrote and what I was experiencing and in short he recommended that I switch to their blue needle in clip 3 SINCE I'm running 32:1. Likely the case with Pro-Circuit as they suggest going to a one step leaner pilot jet and needle clip position Apr 24, 2023 · Most do not change the power jet, if you look at OEM jetting charts over the years they typically want the consumer to change the needle more than anything else. The target weight we used for this suspension setting was a range from 150-170 pounds. Details from JD Jetting Below 2023-2024 Yamaha YZ125X JD Jetting Jet Kit. com Aug 16, 2005 · My YZ125 has a Pro-Circuit works pipe, a SA silencer, and a Vforce reed valve system. com/Some answered questions in this video, JD jetting kit install. It’s a ‘21 I bought brand new this summer so the jetting is stock on it now. Assuming 70 degrees 50% humidity 1000 mb pressure 5000 feet elevation Mar 2, 2022 · Yes the jd jet kit comes with a jetting chart. The spread is just too far. Think I'm seeing the chart, but it might be helpful to post a pic if you can. So now I’m at #420 main, #37. Hope this helps!#howto #jettingspecs #yz125x Jul 6, 2015 · Rode a 2015 yz125 on Friday that I was helping jet. 5 out Main Jet 340-350 Jul 18, 2008 · I used stock jetting of 410 main, 4th clip position from the top and a 40 pilot jet with the 6CHY5-80 needle for 70 degrees and 0’ elevation. While it probably helps to avoid fouling, you are sacrificing a lot of 'roll-on torque*' by running such a small #35 pilot jet. After installing the RAD Valve and Power Wing we felt the need to lean the YZ out with a 420 main jet opposed to the 430 that comes stock, then dropping the needle one leaner, raising the clip to the 2nd position. The jetting is weird on this bike. YZ250(X) 1999+ YZ125 2005-21 & YZ125X 2020-22; YZ125 2022+ & YZ125X 2023+ If you are looking to learn the ins and outs of jetting we have attached detailed instructions on how to jet a two stroke using the YZ250 as an May 24, 2016 · An FMF Fatty shouldn't require much different jetting than the stock pipe, in some cases it can actually work better with leaner settings as the pipe's characteristics (resonance) allows for more efficient cylinder filling. The stock #35 is the smallest size available so if you want to go leaner you’d have to block it off. Air screw and idle were very close right off the bat. Don’t be surprised if you have to re-jet your 2022 YZ125 on day one. The first thing that should be done before you even attempt to mess with the jetting is setting the float to the correct height and inspecting the jet block seal. I’ll take the marginal power gains and a completely new and modern platform. Dec 28, 2015 · I'm currently running a 32:1 mix with 93 octane fuel. Apr 22, 2022 · (2) Jetting. The Apex Technical Innovations head solves all of these issues while giving you an increase in performance where you need it most. 25 out Main Jet 350 1999 Pilot Jet 50 Needle STOCK Clip Position 3RD Air Screw 1. We made it feel better by going from 160 to 162 on the main jet and down from 75 to 72 on the pilot jet. 8 mm (0. Apr 17, 2023 · Anyone have any luck finding correct jetting for their '23 YZ125X? It is jetted very rich from the factory and not a ton of info out there given this is the first year they are running the keihin on the X version. Besides the jetting and shift arm spring (2021 spring works), it’s a much improved YZ125 in the end. Here is the chart from the 250 manual showing the power jet. The kit comes with four main jets, 1 pilot and 2 needles. You can easily gain torque, horsepower and throttle response in minutes, even if your bike seems to be running well. I settled on 62P, 162M, NYCF-2 air screw 1. 5-clip position Dec 29, 2021 · Now, Let's move on to some dyno charts. In your case, say for winter low speed trail riding, you would try the 'summer' settings on the pilot jet and needle, but still install a richer main jet as it's at high rpm the engine would likely seize from being too lean in winter. 98 and it will get you in the ballpark, The homies gear company! http://montramx. Apr 20, 2009 · Hi everyone. The kit comes with instructions and charts that carefully walk through the installation process and offer guidance to help get peak performance at Mar 10, 2025 · Below is the service manual's jetting chart for a 2010 YZ125 (which was known to have pretty much spot-on jetting) While the pilot jet and main jet look to be of similar to yours, the jet needle is perhaps different on the 2006. Don’t forget to get the stationary Jun 5, 2022 · the jetting on the new Yamaha YZ125 was ratty—on the track and on the dyno. Jun 12, 2022 · stock is good enough and I’m picky just not picky enough to keep jetting over riding. Apr 18, 2017 · That jetting was the ProCircuit setting referenced in MXA on their 2023 YZ125 ProCircuit race bike. We took it trail riding and he fouled 6 plugs. This JDJetting kit is purpose-built to improve throttle response throughout the RPM range. com FREE DELIVERY possible on eligible purchases Mar 9, 2022 · Your jetting is dependent on your local elevation, temperature, humidity and track-load factors, but we went a little richer on the main jet (from 160 to 162), leaner on the pilot (from 75 to 72 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. Mar 6, 2021 · I'm starting this thread to serve as a place to ask questions about Apex Technical Innovations cylinder heads (yz250, yz250x, yz125, yz125x). The 2023 Yamaha YZ125X has a MRRP of $7099. Keep in mind it's just a starting point to begin fine-tuning from as each engine will respond a bit differently. There’s even a tip on how to route the overflow drain tube to improve mileage. The kit comes with instructions and charts that carefully walk through the installation process and offer guidance to help get peak performance at Apr 1, 2008 · I have on 06 YZ125 running a #430 main jet, C12 mixed 32:1, +2 on sprocket and it was spot on 2 months ago. The 2022 with stock jetting and air screw tuning is an upgrade over my 2019 . main jets, pilot jet. 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. red Mar 30, 2020 · The only way to know for sure is to experiment, in 2011 when the longer/quieter stock silencer was introduced to the north american models, the stock main jet when up 2 sizes from the previous model years from a #410 to a #430 Mar 21, 2022 · Rich and lean jetting should only be assessed when the bike is in good mechanical condition (no air leaks, fresher top end, newer needle and seat) and up to operating temperature. MXA recommended to go up to the 440 main jet from the 430 that comes stock. 02 leaner correction so multiply your current jet sizes by 0. I’m wanting to ride this weekend and it will be about 40-45 degrees. Bottom end running is killing the bike. Jan 12, 2018 · Buy JD Jetting Jet Kit (No CA) for Yamaha YZ125 2001-2018: Jets & Jet Kits - Amazon. Feb 10, 2025 · JD Jetting JDY021. Oct 7, 2017 · Remember to properly jet the motor, reeds, and pipe&silencer need to be in good shape. I split the cases to find a main bearing grenaded and fixed that and now I am in the process of reassembling the motor. Start with the airscrew at 2 turns out and you will be within ¼ turn + or – from the optimum setting. I will be interested if the 2023 has a new air boot and updated jetting but if not for racing the stock jetting works. I am running the stock main jet, and pilot jet of the 125XC (470/32. Here are our jetting suggestions for your YZ125. Since it came off another 125 I thought the jetting would be pretty close. The bike does have an fmf fatty and power May 23, 2008 · Here's a quick reference jetting chart for '01-'08 YZ250's It was made by taking Yamaha's manual recommendations and using the density altitude calculator to correct for altitude and temperature. How should we jet this bike? Nov 4, 2023 · A quick video of the YZ125 JD Jetting Kit - JDY020 going into my 2024 Yamaha YZ125 50th Anniversary Edition. as of right now what are you guys running on your bike (22-24 yz125)? im at around sea level and temps are in the 80s rn for southern Ontario. Could I run that mixture on the jetting from the showroom floor? Feb 21, 2023 · As for the chart your referencing, I suspect it is somewhat misleading. Picking the right dome or domes for you is an important part of making sure your bike is perfect for you and I'm happy to serve as a resource here or in direct messages. Jun 10, 2024 · Note: if using the nych needle in summer / hot temps, use the 2nd needle clip position Ryder Sigety is a very dedicated racer, and in this video we share his Apr 22, 2020 · The stock jetting was a #430 main, 3rd position on clip, #40 pilot. maybe this will help. 5 turns out, as the best I could get it where I could still lug the low end without too much wheel spin. 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 !! Jan 19, 2021 · that pilot jet is quite small, the needle is leaner at initial throttle opening, and, the main jet quite large. Oct 4, 2024 · On my 2024 YZ125X I’m running the JD trail spec but using a 60 Pilot to get rid of the lean bog (recommended pilot is a 50). 15 in. I got it for $100. First make sure your float height is adjusted to specs. The setting is 165 main, 62 Pilot, and Y3 needle in the 3rd clip. Mine runs it's best one step richer on all metering circuits than what is suggested. Parts List. Nov 26, 2013 · I have a 1999 yz125 with fmf fatty. James Dean purpose-built this jetting kit for riders looking to improve running performance and throttle response throughout the RPM range. Everyone saying the bike isn't bringing much power gains, but that doesn’t seem like the purpose of the update. Main Jet 410 2002 Pilot Jet 30 Needle STOCK Clip Position 3RD Air Screw 1. FMF fatty pipe and shorty silencer. You have to get a 62 pilot separately. 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. We made changes for our SoCal elevations, temperature and humidity. What would be the optimal jetting settings for here in michigan?(0-1500ft) for the summer 70-80 degrees and right now in winter 10-35 degrees Jul 28, 2022 · Hello guys! I've recently bought a 1994 YZ125 in pretty good condition as my first dirt bike. 165 main. it's an old 00' yz125 I don't believe it's the stock carb becuase when I search for jetting specs main jet is listed in 400s instead of the 170 Jun 10, 2010 · Im running 32:1 Yamalube R. also explaining which circuit affects what part of the throttle range etc. Faster riders, dunes, atmospheric conditions, or other aftermarket parts can require richer jetting than our recommendations . It’s a better bike overall. 185 main, 60 pilot, Red needle in 4th clip. Is it assumed that all jetting specs are for sea level at 80 degrees or something? Weird. Sep 21, 2023 · Hi all, Recently installed an APEX cylinder head with XC dome on my '23 YZ125X to correct the squish. The suspension is very similar to the motocross version’s right down to the spring rates (which are stiffer than those of last year’s X). 00 off eBay. im not buying the Yamaha screwed up with the jetting anymore. Jul 3, 2020 · Here are the 38mm Mikuni TMX jetting specs: Main jet: 430 Pilot: 40 Needle: 6BFY43-3 Clip: 3rd from top Air screw: 2-1/4 turns out Notes: Yamaha includes one richer (440) and one leaner main jet Jul 18, 2022 · Me and my brother both got new 22 yz125 and ride on the trails/enduro but the plugs keep on fouling every half hour. My next investment is going to be the vforce reed cage setup. Keep in mind these settings are for MX track riding, if low speed trail riding the pilot may be a tad rich and, Jul 13, 2022 · In this video I run through the process of how I personally fine tune the jetting on my 2018 Yamaha YZ125. JD Jetting Jet Kit Yamaha YZ125 YZ 125 2001 - 2021 High Performance JDY005 NEW | eBay Even better, technical support is provided. Don’t need a pile of parts I don’t use. We did a huge amount of testing - most of which isn't shown in the video. We also moved the clip on the needle from the second to the first line on the top to lean it out. Owner put a pro-circuit shorty on as per my suggestion that he get a 05-10 stock silencer or a aftermarket. Mar 14, 2025 · Don't know much about jetting issue like to run my bike a teed bit rich recent the carb setting were 410 main 50 piolet 3rd clip and 2. Before you start the jet testing, Install a fresh plug. Mar 19, 2022 · Great to hear. 2-1/4 turns out on the air screw for 50°F 'winter' jetting, recommendations are: #42. Feb 22, 2022 · I have 15 hours on the bike and 5 or so with the current jetting. 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 needles in the chart differ in 1 of 2 ways, or a combination of both. Feb 9, 2000 · trending. He has a rad valveand stock pipe. New JD Jetting Jet Kit for the 2023-2024 Yamaha YZ125X. May 9, 2011 · I plan on riding it the day I buy it so I won’t have much time to mess with jetting before I ride. That did not fix the issue but made it better. This 2 stroke jetting guide will show you how to start getting results in minutes, even if you're new to jetting. 5 pilot, 2nd clip position. Jul 18, 2022 · I heard the rave about the pro circuit jetting and the y4/y3 needle but they are sold out everywhere. 5), but changed my needle jet from an s-7 to an s-4, and the jet needle from a 43-75 to a 43-74. 5 pilot jet #42-73 needle / 3rd clip (that's the optional '1/2 clip richer' needle) #420 main jet. Click to expand Stock jetting, yamalube 32:1 with 50/50 mix of pump premium and race gas. Bike has a Pro Circuit pipe and silencer, Vforce 3 and I currently have a 420 main, 38 Pilot, stock needle 3 from top, and airscrew at 1 and 3/4 turns out. The Y3 needle is the key to making this jetting work. Feb 12, 2023 · The stock / factory service manual jetting chart settings are usually a good starting point (70°F) but most will find the pilot jet circuit is a tad too rich and tends to load up. I’m in the Midwest so elevation won’t be an issue. This is what we found out so far. Trying to jet a worn out engine is a waste of time. 5: Pilot Jet: 35: Starter Jet: 80: Valve Seat Size: 3. 5 or # 40 pilot jet and a # 430 or #440 main jet. JD Jetting kits are designed so that you don’t have to be an expert to get professional high performance results!! Each two stroke kit typically includes: – two, dyno developed and tested, multi-taper needles – four main jets – comprehensive detailed instructions with color photos – a needle clip Feb 18, 2021 · Here are our 38mm Mikuni TMX jetting specs: Main jet: 430 Pilot: 40 Needle: 6BFY43-3 Clip: 3rd from top Air screw: 2-1/4 turns out Notes: On our full-race Pro Circuit-built Ryan Villopoto replica 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. (3) Wheels. Details from JD Jetting Below: James Dean purpose-built this jetting kit for riders looking to improve . 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. 62 pilot. This would make sense to go up a size in the main jet correct? Oct 12, 2017 · Agree - I spent (gained experience lol) for a few months on my project bike with the carb that came with it (38 mm Milkuni on an 01 YZ125). I highly encourage you to read that jetting thread as many time as you need to understand it. I have a '06 YZ 125 and use it for a mix of track and trail. The bike hauls. I run pump gas but I'd be ok with 50/50 pump/C12 if Dec 11, 2023 · The single best mod for most 2 strokes, including the YZ125, is getting the jetting right. Before making a purchase, please carefully review all pictures, read the condition report, and consult the fitment chart to ensure compatibility. Feb 22, 2022 · Hey everyone, Picking up my YZ125 from the dealer soon. 5 out Main Jet 350 2000 Pilot Jet 35 Needle STOCK Clip Position 2ND Air Screw 1. James Dean designed this jetting kit for Yamaha riders looking to push their motorcycles to the next level. Worn reeds will mimic rich jetting, and worn rings will mimic lean jetting. Some tips and tricks, and another video to be mor Jun 5, 2013 · If your engine has a worn top-end, fix it first. Been struggling with the jetting but I feel like I managed to get it better . While waiting on parts, I started to clean the carb and saw that the main jet was a 360. Mar 1, 2016 · According to the service manual, stock / 70°F baseline jetting is: #40 pilot jet #42-74 needle / 3rd clip #410 main jet.
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