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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ250 Jetting Problems
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[QUOTE="SpectraSVT, post: 843920, member: 30250"] To add to your confusion, I have 2003 (same engine as 04) with Factory Fatty. I get smoke from the vent line also but my bike is running lean. Fmf reccommends 178 main needle in 3rd pos. and a 50 pilot. I run 178 main 2nd clip pos. and a 52 pilot. Its running lean. The bike surges in the midrange. But if I put the needle in the 3rd clip pos. to fatten up the midrange the pilot is too fat. And the bike won't stay on during idle with a leaner 50. 48 pilot makes it rev out like its sucking air in massive amounts, won't shut off with kill switch. Only thing I have left to try is a 180 main. and if that don't work I may just dump the stupid FMF and go with the PC Platinum I had before. Never had one issue with the PC pipe. The FMF has been a headache from day 1... [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ250 Jetting Problems
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