Carb tuning help 07 yfz 450 - Yamaha Raptor Forum
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post #1 of 2 (permalink) Old 03-20-2015, 08:43 AM Thread Starter
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Carb tuning help 07 yfz 450

Bike has full HMF
No air lid with foam filter
48 pilot
178 main

problem is under throttle sounds like it is hitting rev limiter. just purchased bike and as soon as I went to ride it this occurred. Looks like the starter jet is supplying fuel at all times. Anyone had this problem before?
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post #2 of 2 (permalink) Old 06-09-2015, 11:46 PM
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Your jetting (in my experience) is too rich. It will hit a rev limiter in neutral or when it thinks the parking brake is engaged. Pb rev limiter is an issue on most of Yamaha bikes.

Your jetting assuming stock head should be closer to a 168 main and 45 pilot. I also run the needle out of the yz (ncvq I think) one notch rich of center.

2015 700Rse
Fci, PC5F/I, monster exhaust, +2 Cuervo head, HDD5150, 54mm throttle body, 105.5 14:1, +8 swingarm.
08 yfz450se
Sparks big core, k&n no lid, yz needle, yz timing mod, +4 swingarm.
Cuervo 870, lectron, msd, monster megs, single a-arm lightened chasis, +14 swingarm.
Cuervo 930, lectron, msd, db fab titanium chasis.
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