Question about 2004 Yamaha YZ 450 F
Bought bike used, not ridden much, could not get to idle, suspected problem in carb pilot jet, took apart and cleaned carb, pilot was plugged, cleaned carb with spray cleaner, got flow through every port we could find. bike now idles ok sometimes, then sometimes revs higher, like on a fast idle. bike backfires, acts like running lean. messed with pilot jet adjustment, got to run a little better, but something still aint right. got carb pulled back apart now. ideas?
I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.
Posted on Mar 12, 2009
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