Engine cutting while cruising, fine while gettimg on it. - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 19 (permalink) Old 04-05-2013, 08:32 AM Thread Starter
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Engine cutting while cruising, fine while gettimg on it.

Greetings.

I have a a 2007 VN900C with about 21.5k miles. It has Cobra speedster longs as only mod. When cruising or slowing down, the engine misfire's. However, when I speed up, it sounds fine. Both plugs and air filter were replaced last month. Old plugs were normal brown color. Bike never feels like it's losing power. Any ideas?
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post #2 of 19 (permalink) Old 04-05-2013, 08:40 AM
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Maybe needs more fuel.

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post #3 of 19 (permalink) Old 04-05-2013, 09:21 AM Thread Starter
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Yeah, that's what I was thinking. The pipes are really black inside. Is there a way to increase fuel w/o getting a manager?
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post #4 of 19 (permalink) Old 04-05-2013, 09:48 AM
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Are you saying mis-fire or backfire (popping)?
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post #5 of 19 (permalink) Old 04-05-2013, 09:56 AM Thread Starter
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It has decel pop. But it sounds like it cuts out while cruising at partial throttle. It is more apparent at highway speeds. Doesn't seem to effect overall performance.
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post #6 of 19 (permalink) Old 04-05-2013, 10:24 AM
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Part throttle cruise...what indications are you having that the engine is missing?
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post #7 of 19 (permalink) Old 04-05-2013, 10:31 AM Thread Starter
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Originally Posted by sfair View Post
Part throttle cruise...what indications are you having that the engine is missing?
The sound of the motor. Other than that, I get no hesitation, no surging. Just sounds like the motor has a misfire while on partial throttle for cruise. I've had it well over 100 MPH before and it handled it like a champ. So, I don't know if what I am hearing is an actual mis-fire, or just normal noise due to aftermarket pipes. Considering the pipes are black inside, I image the bike is running a bit too lean.
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post #8 of 19 (permalink) Old 04-05-2013, 11:16 AM
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Black is rich. Can you describe what you hear...is it out the pipes, at the motor, etc?
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post #9 of 19 (permalink) Old 04-05-2013, 11:21 AM Thread Starter
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Black is rich. Can you describe what you hear...is it out the pipes, at the motor, etc?
I mainly hear it from the pipes. It sounds like an engine misfire, just w/o the associated lack or power / surging.
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post #10 of 19 (permalink) Old 04-05-2013, 11:28 AM
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Quote:
Originally Posted by thewiesercracker View Post
Greetings.

I have a a 2007 VN900C with about 21.5k miles. It has Cobra speedster longs as only mod. When cruising or slowing down, the engine misfire's. However, when I speed up, it sounds fine. Both plugs and air filter were replaced last month. Old plugs were normal brown color. Bike never feels like it's losing power. Any ideas?
You might try plugging the fresh air going to the PAIR system, also called "marbling" on this board. Do a search of this board and then temporarily plug the system to see if there's any change. It's all free.
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