Knocking in the engine - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 07-24-2017, 01:37 PM Thread Starter
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Knocking in the engine

My wife rides a 94 750 When it is running there is a knocking in the kick stand side front cylinder. It used to come and go but is more there now then not.It sounds like an older car lifter knock. Any ideas.
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post #2 of 10 (permalink) Old 07-24-2017, 02:11 PM
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very common problem is the automatic cam tensioners failing.. conversion to manual is the way to go. there is one tensioner per cylinder
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post #3 of 10 (permalink) Old 07-24-2017, 02:43 PM
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is the noise in the bottom of the motor or up by the top?and does it have any abnormal vibrations? look up the Grambo Trick to check the tensioners

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post #4 of 10 (permalink) Old 07-24-2017, 02:48 PM Thread Starter
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The noise is not from bottom for sure seems to be in the middle of front cylinder. I was told to play with the adjuster to see if noise goes away. Noise seems to be in that area
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post #5 of 10 (permalink) Old 07-24-2017, 04:30 PM
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then it's most likely the ACCT

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post #6 of 10 (permalink) Old 07-24-2017, 04:33 PM
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https://www.vn750.com/forum/37-engine...rick-acct.html Grambo trick,pulled hot outta the Vulcan Verses

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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
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post #7 of 10 (permalink) Old 07-24-2017, 07:13 PM
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post #8 of 10 (permalink) Old 07-25-2017, 06:52 PM
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I would check the Balancer Dampers....I had similar issue and could not pinpoint the location.
I changed out the dampers and it fixed the issue.

See my link

Check my last post for details on how to check the balancer damper rotational play....worn dampers will make a noise that sounds like a knock or intermittent "tapping".
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post #9 of 10 (permalink) Old 07-26-2017, 06:07 PM Thread Starter
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Thanks everyone. I found a post by Warren that said try the GRAMBO TRICK.
GRAMBO TRICK:

You just take the little bolt off the top of the tensioner housing.
Then turn the little slotted bolt inside. You can feel one way
(clockwise) retracts it against the spring. Let go and it will spin
back in. The idea is that they sometimes get "stuck", so after it
spins back down, try to turn it a bit more in the CCW direction.
Dunno if it's the plunger itself that sticks, or the chain guide
inside that needs a bit more pressure than the spring allows
to "unstick". Anyway, this is a no-risk process and some members
have said they've gone thousands of noise-free miles after doing
this.
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post #10 of 10 (permalink) Old 07-26-2017, 08:49 PM
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Quote:
Originally Posted by OleDirtyDoc View Post
is the noise in the bottom of the motor or up by the top?and does it have any abnormal vibrations? look up the Grambo Trick to check the tensioners

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Quote:
Originally Posted by OleDirtyDoc View Post
https://www.vn750.com/forum/37-engine...rick-acct.html Grambo trick,pulled hot outta the Vulcan Verses

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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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