new bike some issues-rejet? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 07-11-2017, 04:19 PM Thread Starter
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new bike some issues-rejet?

picked up a 99 vn750 and she fires right up. has vance and hines pipes on it. Noticed at around 1000rpm and less(and at idle) doesn't sound like the rear cylinder fires all the way and is sluggish to get going. After 1000-1200rpm she take off and can hear the rear cylinder/exhaust really kick in and louder. Now at times, not always, when I go to start it seems as though the motors binding like the starter is stuck. Hit the button a few times and it'll crank over and start.
Assuming of course the carbs need cleaned, tried the seafoam and no luck. Will the carbs also need to be rejetted with the v+h exhaust?
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post #2 of 7 (permalink) Old 07-11-2017, 04:35 PM
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well, "1000 rpm and less and at idle" is a problem. idle spec is 1100 rpm.

I would do the simplest (and cheapest) first, that is set the idle at 1100-1200 when fully warmed up. see if that clears up the rear jug.

when you say it seems like the motor is stuck when starting, is the starter motor engaging, but not able to spin engine thru a full cycle? (such as if you had a cylinder filled with gas and it was hydraulic locking). that is a common symptom when using a wet cell battery, or problems with battery cables/connections (there is a ground near the battery box on frame thats notorious for bad connection)

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Last edited by michiganteddybear; 07-11-2017 at 04:39 PM.
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post #3 of 7 (permalink) Old 07-11-2017, 05:15 PM
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You may have to just pull the carbs and clean the jets. Your pilot might be cruddy

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post #4 of 7 (permalink) Old 07-11-2017, 05:28 PM
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Shut off the petcock with the engine running and see if it smooths out. If the float is stuck you can be flooding the rear cylinder and shutting off the gas will allow the float bowl to empty out. Your should be able to run it for a minute or 2 before it runs out of gas.

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post #5 of 7 (permalink) Old 07-11-2017, 06:06 PM
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here's something you can try https://www.vn750.com/forum/22-carbs-...arb-clean.html oh,by the way, you wouldn't happen to be on the cupboards forum under the same name?

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post #6 of 7 (permalink) Old 07-14-2017, 12:03 AM Thread Starter
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thanks for the response. I believe that may be the issue, hydroli locking. At leat a mechanic I was talking to suspects.
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post #7 of 7 (permalink) Old 07-14-2017, 12:30 AM
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Quote:
Originally Posted by OleDirtyDoc View Post
here's something you can try https://www.vn750.com/forum/22-carbs-...arb-clean.html oh,by the way, you wouldn't happen to be on the cupboards forum under the same name?

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edit gunboards forum

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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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