popping sound - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 12-05-2008, 07:24 PM Thread Starter
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Location: Katy, Tx (Houston)
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popping sound

i have a 99 VN 750, my bike seems to pop or misfire when i rev the engine and when i down shift ( usually first and second gear). what should i do and how do i fix it? i think its due to a lean fuel mixture but i do not know how to adjust it. thanks, tim
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post #2 of 4 (permalink) Old 12-05-2008, 08:55 PM
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Welcome to the forum fiendclub, I think? lol Your location of "katy" is a bit vague, but I assume you have a US bike with all the anti-pollution hardware and hoses installed. It sounds like you are getting the popping on deceleration, where you have more unburned fuel dumped into the exhaust. The reed valves open to admit air to complete the combustion in the exhaust manifold,coming right off the cylinder head, and into the pre-muffler chamber, (often refered to here as the goats belly), which causes the popping sounds you are experiencing. Many here have greatly reduced the problem by plugging 2 vent hoses with an ordinary marble. If you check the Vulcan Verses under the exhaust section, read the thread on reducing popping, there is a more complete description of the process.

By the way there is a Newbie checkin forum where you can tell us a little about your self and your scoot, mods, etc. If you indicate where you live, you may be close to another member of the forum who can help out or be a riding buddy. Good luck in quieting the Vulcan down, and come back soon.


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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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Last edited by OlHossCanada; 12-05-2008 at 09:14 PM. Reason: More direct line to verses.
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post #3 of 4 (permalink) Old 12-05-2008, 10:02 PM
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Welcome aboard friend, are you from Katy Tx. It is a normal sound, but Hoss has it all right on how to get rid of it.

02 honda sabre 1100

Last edited by niterider; 12-05-2008 at 10:43 PM.
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post #4 of 4 (permalink) Old 12-05-2008, 10:40 PM
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welcome to the forum...is that "fiend club" as in the misfits...if so, nice to meet another fiend on a VN!

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