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A motorcycle jerk or backfire can come from the choke not shutting off completely, the fuel jets might be clogged, a gasket or seal may be broken. Valves that are out of adjustment could also be the problem.

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11y ago

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Why does 92 caprice backfire after running for a while or heavy exceleration?

A backfire is caused by a misfire... a cylinder fails to ignite the fuel which may cause a stutter, it may also cause a back fire due to it pushing that un-ignited fuel into your manifold where it then ignites from the heat of the other cylinders and boom you have a backfire...


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