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shiftracer

Backfiring in acceleration and deceleration on YZ400f?

2 posts in this topic

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

Thanks

Cole

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

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