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Dirt Bike Brands - Other
I'm confused
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[QUOTE="adam728, post: 1410145, member: 55463"] 50 jet is stock in a 01 YZ250, and most people agree it's too rich. I can't imagine running a 55 or even a 52. I run a 45 90% of the time in my 05, occasionally stepping up to a 48 for really cold weather (last ride was mid 20's). You really need to: [list][*]Go through the carb and make sure every bit of it is spotless. [*]Set the float height. [*]Make sure all the breather lines are clean and not clogged up. Do these first three before messing with the jetting. [*]Does your bike use any transmission oil? Disapearing tranny oil can get sucked through the right side crank seal, burn with a ton of smoke, foul plugs, etc, mimicing rich jetting. [*]Make sure the bike is up to temp before messing with the air screw and throttle response, meaning you've ridden it around some. Idling a few minutes and then reving it while sitting on the stand will get you no where when trying to work out jetting. [*]A bog is typically lean. Blubbering is too rich. A hesitation, then "cleaning out" is too rich as well. [/list] As was said earlier, all bikes are different. There's a big thread on another forum about what jetting YZ riders are using. I don't know your altitude or temps, but in most "normal" conditions (say 0-3000 ft, 50-80F) guys are finding generally 45-50 pilot Stock needle on 2nd or 3rd clip from top 168-178 main I typically run 45 pilot, stock needle 2nd clip from top, and 172 main, and I'm far from being too lean. Then again someone else with the same bike as mine might find they need to be 2 sizes richer. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
I'm confused
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