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https://www.yamahamotorsports.com/motorsports/owners-manuals
page 37 once you select bike/year/model
Picked up an older AF YZ2 to flip that has updated jetting specs, but runs like crap.
Trying to sort it out.
If you put in this jetting (either needle) and run 32:1, the bike should run reasonably well. If it doesn't you have other problems. You'll sometimes see YZ250's with much leaner jetting like 162-165 main and 45 pilot from guys who are either slow woods riders, at elevation, or running lower oil ratios like 50:1.
The Shop
I haven’t had a chance to open up the carb yet, but it is running lean. Hoping to get it done next weekend.
Also, here in the USA the term "slow jet" is a synonym for the pilot jet.
Also, here in the USA, the power jet, or what you are calling the slow jet, is also a size 50 stock. Not sure about Canada.
Post a reply to: 2019 YZ250 oem jetting specs ?