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Michaelh1001 Started a new thread 22’ YZ250F backfires on cold start
3/7/2024 5:41pm 22’ YZ250F and it commonly backfires (loud bang) when doing a cold start. It only has about 20 hours and has always had a clean air filter each ride. Once I start riding it, it runs great, it sometimes gets minor deceleration pops sometimes which isn’t bad. I’m not sure, is it unburnt fuel, spark plug, etc? Also, sometimes there...
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Michaelh1001 Added a reply to YZ125 bogging.
9/2/2022 9:23am Ok I’ll take a look at that soon
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Michaelh1001 Started a new thread YZ125 bogging.
9/2/2022 8:26am I got a 17’ YZ125 and recently on the last 2 rides it seems that right when I start it and ride it the powervalve doesn’t want to open up and just keeps bogging, this happened after putting a lightly used spark plug in, so I gone ahead messed with the idle/air screw and put a new spark plug in...
This forum thread has 6 replies.
Michaelh1001 Added a reply to Do I have to rejet 2017 yz125 with fmf fatty and Powercore 2.
8/11/2022 12:35pm Honestly it runs great, it pretty much never bogs and sounds like it’s alive at all times. I’ll just leave it as it is
Michaelh1001 Started a new thread Do I have to rejet 2017 yz125 with fmf fatty and Powercore 2.
8/10/2022 10:52pm 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. I’m aware of the JD jetting kits but I’d like to know what kind of jets+needles I would need. Thanks
This forum thread has 2 replies.
Michaelh1001 Started a new thread Can I run a Wiesco piston in a “C” size cylinder on a 2017 yz12
6/22/2022 11:20am The bike has around 35-40 hours and mainly trail ridden, and it’s only showing about 120 compression so I ordered a Wiesco piston (https://www.royaldistributing.com/wiseco-piston-kit-yamaha-063102.html) I’m not totally sure if it will fit or if I have to get the matching letter. 
This forum thread has 9 replies.
rjg Liked a reply to forum topic should i run an "A" size Pro X piston in my "C" size cylinder on my 2017 yz125
6/20/2022 6:05pm
Straight from ProX You are going to have to measure or just take the risk. 7. Before installation, the size of each individual piston should always be checked. In general pistons should be measured on a 90 degrees angle to the wrist pin and at 25% of the piston length from the bottom of the skirt. The piston and cylinder size should result in correct piston to cylinder wall clearance for the specific model. The chart below gives a general indication of clearance by capacity but original model specifications should always supersede the table below. Recommended maximum hours use. (competition)...
This forum topic has 10 replies.
Michaelh1001 Added a reply to Can I run a Wiesco piston in a “C” size cylinder on a 2017 yz12
6/20/2022 6:04pm I understand that, but will the piston be good for its first top end, the link https://www.royaldistributing.com/wiseco-piston-kit-yamaha-063102.html.
JohnCharlesC Liked a reply to forum topic Can I run a Wiesco piston in a “C” size cylinder on a 2017 yz12
6/20/2022 6:03pm
If this is the bikes first top end from the factory, you have a "B" size piston in your picture. A = Red Inner Gasket B = Orange Inner Gasket C = Green Inner Gasket D = Purple Inner Gasket
This forum topic has 9 replies.
Rickyisms Liked a reply to forum topic Can I run a Wiesco piston in a “C” size cylinder on a 2017 yz12
6/20/2022 6:03pm
You should check out this thread https://www.vitalmx.com/forums/Tech-Help-Race-Shop,42/should-i-run-an-A…
This forum topic has 9 replies.
Michaelh1001 Added a reply to should i run an "A" size Pro X piston in my "C" size cylinder on my 2017 yz125
6/19/2022 7:13pm What about a wiesco piston, don’t those work as a one size fits all? https://www.royaldistributing.com/wiseco-piston-kit-yamaha-063102.html#…
Michaelh1001 Added a reply to should i run an "A" size Pro X piston in my "C" size cylinder on my 2017 yz125
6/19/2022 6:25pm Would you recommend a Wiesco Top End kit - 845M05400, I’ve seen that people were saying they’re 1 size fits all. Is that true, if so I’ll just return the pro x and buy the wiesco for a extra $20. Link to the piston kit - https://www.royaldistributing.com/wiseco-piston-kit-yamaha-063102.html#….
Michaelh1001 Started a new thread should i run an "A" size Pro X piston in my "C" size cylinder on my 2017 yz125
6/19/2022 5:46pm the bike has around 35 hours and im trying to do a top end and ive called the place that sells it "royal distributing" and they said that ill be fine having it as it's the standard size. Also on the website there was no option of A,B,C, or D and it came in the other day showing it with...
This forum thread has 10 replies.