Backfire at shutdown - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 6 (permalink) Old 09-09-2019, 08:41 AM Thread Starter
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Backfire at shutdown

Hey guys. I have a 96 vn800a I picked up really cheap. It runs really good except a bit of really light backfire when accelerating, and then when I shut the bike off, there a muffled pop I can hear and feel from the intake. Could this be spark plugs not burning off the fuel fast enough? Or maybe a timing issue? Thank you!
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post #2 of 6 (permalink) Old 09-09-2019, 09:16 AM
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Possible loose exhaust manifold, loose carb boot, bad gas in the tank (if you haven't run it much yet). Carbs might need cleaning. Look at the color of your spark plugs. Cheap and easy diagnostic to get you started diagnosing the problem.

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post #3 of 6 (permalink) Old 09-09-2019, 09:35 AM Thread Starter
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Thanks, I'll check the exhaust and plugs. I have cleaned the carb, ensured its seated well, and has brand new gas in it with a new inline filter. Wanted someone elses opinion who knows more than myself before I started spending money on unnecessary parts
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post #4 of 6 (permalink) Old 09-09-2019, 10:11 AM
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Make sure the inline filter is designed/able to supply enough fuel under gravity feed.
Some will not.
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post #5 of 6 (permalink) Old 09-09-2019, 10:42 AM Thread Starter
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I made sure to buy a high flow filter, but It did this before the filter was installed.
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post #6 of 6 (permalink) Old 09-10-2019, 04:02 PM
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Sparkplug could be misfiring and the heat from the exhaust is lighting expelled gas
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