Backfiring when letting off of throttle - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 06-07-2014, 11:46 AM Thread Starter
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Backfiring when letting off of throttle

Does this mean im running too rich, too lean?
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post #2 of 24 (permalink) Old 06-07-2014, 11:54 AM
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Probably not actual backfiring.

Is it popping when closing the throttle at low rpm or from highway speeds?
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post #3 of 24 (permalink) Old 06-07-2014, 03:18 PM
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Have you done any mods to the bike? I recently did the earshave and V&H exhaust. I had the same issue and just had to adjust the air/fuel screws on the carbs.
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post #4 of 24 (permalink) Old 06-07-2014, 06:24 PM Thread Starter
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Quote:
Originally Posted by wmsonta View Post
Probably not actual backfiring.

Is it popping when closing the throttle at low rpm or from highway speeds?
Yup popping at low rpm everytime i let off the throttle.. Do i fix that with the air/fuel screws on the carb like howard said?
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post #5 of 24 (permalink) Old 06-07-2014, 06:26 PM Thread Starter
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Have you done any mods to the bike? I recently did the earshave and V&H exhaust. I had the same issue and just had to adjust the air/fuel screws on the carbs.
I just bought the bike a few weeks ago and discovered the guy that had it cut out the H pipe between the pipes and welded up the holes from that..thats the only mod that i know of
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post #6 of 24 (permalink) Old 06-07-2014, 07:22 PM
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I don't know the specifics with that exhaust mod, but I would turn the screws CAREFULLY all the way in and the start at two and a half turns out. This is the general guidelines the brains on this sight would suggest. I ended up with 3 turns on the front and 2.5 on the rear cylinder. This is a few threads on this kind of problem already. I would search for them and read them. FYI the screw for the front cylinder is on the left and rear on the right. It took me a while to realize this. Hope this helps.
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post #7 of 24 (permalink) Old 06-07-2014, 07:30 PM Thread Starter
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Thanks a bunch! Much appreciated!
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post #8 of 24 (permalink) Old 06-07-2014, 09:05 PM
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Quote:
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Yup popping at low rpm everytime i let off the throttle.. Do i fix that with the air/fuel screws on the carb like howard said?
Yes, that will help. About the only thing that will. If you try to completely stop the popping, it will idle way to rich for my preference.

Have you coaster-ed or marbled yet?

Any exhaust leaks at the head?
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post #9 of 24 (permalink) Old 06-07-2014, 09:05 PM Thread Starter
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Anyone got a pic of the screw for location.. I found the one on the bottow near the idle screw but i dont see the other one
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post #10 of 24 (permalink) Old 06-07-2014, 09:13 PM Thread Starter
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Quote:
Originally Posted by wmsonta View Post
Yes, that will help. About the only thing that will. If you try to completely stop the popping, it will idle way to rich for my preference.

Have you coaster-ed or marbled yet?

Any exhaust leaks at the head?
I dont know what either of thise things r or know how to do them until explained lol
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