Backfiring in acceleration and deceleration on YZ400f?

1 reply to this topic
  • shiftracer

Posted September 13, 2006 - 03:12 PM


Well, my bike sat for about a month, and when I took it out one day it began backfiring a ton in acceleration and deceleration. Is it time for valve shims or is there something else that can go bad? Let me know

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  • grayracer513

Posted September 13, 2006 - 03:31 PM


The most likely culprit is varnish from evaporated fuel blocking or partly blocking a jet in the carb.

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