Sputtering and Idling - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 04-18-2015, 05:53 PM Thread Starter
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Sputtering and Idling

Please forgive the immediate barrage of questions to the board pertaining to my "new" bike, but I'm getting a little frustrated with a problem that it has.

When it gets good and hot, it sputters on acceleration. Higher RPMs tend to smooth it out, but a fresh gear really shows it unless I gun it.

I have a gas leak in a hose that I've shown here, before. I've fixed the leak to an extent, but I need to do a little better with it.

Anyway, the sputtering happens when it's colder, too, but it isn't as "distinguished". It's REALLY there when the bike heats up.

There are no mods done to this bike, so it's pretty stock, that I can tell. I have changed the spark plugs in it, but that hasn't really seemed to help.

Also, at times, when it's idling, it goes from high revving to low revving and back again, sometimes, on its own. If I rev it up while I'm in neutral at a stoplight or something, sometimes it takes it a while to come back down.

Any ideas here?

Mike's Moving
Orlando, Florida

2002 VN750

Need to know the part number to a confirmed 18mm Deep Well socket bit to change your VN750's spark plugs?

Craftsman Part Number 50728
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post #2 of 8 (permalink) Old 04-18-2015, 06:32 PM
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sounds like a vacuum leak some place.

around the boots is common. they have been known to crack and dry out

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post #3 of 8 (permalink) Old 04-18-2015, 06:59 PM
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Get out some starting fluid and spray the boots while the bike is running .if she revs than bingo

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post #4 of 8 (permalink) Old 04-18-2015, 08:54 PM
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You can use WD 40 too...

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post #5 of 8 (permalink) Old 04-18-2015, 10:07 PM
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I don't think WD40 burns anymore, but it should make it stumble.

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post #6 of 8 (permalink) Old 04-18-2015, 10:24 PM
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Yup it'll stumble

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Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #7 of 8 (permalink) Old 04-18-2015, 11:32 PM Thread Starter
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I thought my boots looked pretty good. Not really cracked or anything, at least not where they attach to the carbs. Could it be further up?

I might be lacking the lingo here, though. I assume the boots are the big black hose that attaches to the carb? Whatever that big black hose is, it seems to be pretty fine.

Mike's Moving
Orlando, Florida

2002 VN750

Need to know the part number to a confirmed 18mm Deep Well socket bit to change your VN750's spark plugs?

Craftsman Part Number 50728

Last edited by OrlandoVulcan; 04-18-2015 at 11:48 PM.
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post #8 of 8 (permalink) Old 04-18-2015, 11:57 PM
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Between carb and motor

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Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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