Knocking - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 07-15-2019, 04:00 PM Thread Starter
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Knocking

Picked up a 1987 vn750 off of a trade, it needed a clutch has everything torn down on it when i picked it up(a gamble i know) got the new clutch put it and went to fire it up and it wouldn't start very easy but i got it going for like 10 second and it was knocking pretty good, seems to be coming from the middle or upper of the front cylinder, what do you guys think?
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post #2 of 14 (permalink) Old 07-15-2019, 04:27 PM
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Knock knock, who's there?

Wasted crank bearing, broken ring, worn wrist pin, broken balancer, or damaged rod.
Either way, you likely need to tear down the motor to find out. I'd suggest not trying to run it until you find out what's wrong.

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post #3 of 14 (permalink) Old 07-15-2019, 04:27 PM
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Could be Cam Chain Tensioners. Look around the forum for ACCT, MCCT conversion, and the grambo trick for some info on figuring out how these work, how to diagnose and how to possibly fix.

Could still be rod knock, but if it's high in the engine I would guess not
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post #4 of 14 (permalink) Old 07-15-2019, 04:52 PM
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Al those things Knifemaker mentioned can cause a knock. Could also be piston slap. A loose cam chain usually causes a rattle. If it actually is a knock, that is not good. It is usually reciprocating parts that cause a knock.

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post #5 of 14 (permalink) Old 07-16-2019, 11:02 AM Thread Starter
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It already has the manual cct installed on it, i have a video just have to figure out how to upload it
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post #6 of 14 (permalink) Old 07-16-2019, 11:03 AM Thread Starter
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Its hard for me to tell if its a knock vs a tick, im not entirely sure ive never heard a true rod knock on a motorcycle before just cars
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post #7 of 14 (permalink) Old 07-16-2019, 11:06 AM Thread Starter
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Uploaded the video to youtube

https://youtu.be/MUCviP29iSw
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post #8 of 14 (permalink) Old 07-16-2019, 11:25 AM
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Quote:
Originally Posted by Cory View Post
Uploaded the video to youtube

https://youtu.be/MUCviP29iSw
Oh that definitely sounds like a rod knock.

One way to verify ... Remove the plug wires from the cylinder you think is knocking, then start it. If it's a rod, the knock should be reduced or stop completely with the spark removed. You'll have to hold the idle up with one cylinder running, idle speed will be cut in half.

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post #9 of 14 (permalink) Old 07-17-2019, 09:52 AM
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What would cause a ticking sound? Mine has one at idle while cold but it's not terribly pronounced
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post #10 of 14 (permalink) Old 07-17-2019, 10:31 AM
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A ticking sound. A hydraulic lifter loosing a bit of oil overnight and pumping back up or upper cam chains go slightly slack when cold.

Post a video of it when cold. Senior members may be able to tell what it is.

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