Backfiring but not what you think. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 2 (permalink) Old 07-09-2008, 02:51 PM Thread Starter
Join Date: Jun 2008
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Backfiring but not what you think.

I bought this bike not long ago and though, according to my posts, it must seem like i got a bad bike but it has run strong so far and the only thing that has happened to it is the rubber on one turn signal dried out and cracked.
the rest has been my lack of knowledge.

Now onto this next predicament.

The bike has been backfiring on throttle down (still can be avoided when careful with the throttle) and was told it was the reed valves and they could be modified with a marble in the air tubes. The seller also told me about this but then I look and see there already is a marble in at least one of the tubes, so he obviously already modified it but the bike still backfires.

What is the most common cause of this? Too much air getting into the carbs? and if so what do I do about it?

Thanks for the help in advance.
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post #2 of 2 (permalink) Old 07-09-2008, 03:03 PM
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Running to lean. Theres A LOT of threads on this within this site about adjusting your air mix screws. just do a quick search and theres one with pics too.


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