Anyone ever deal with a wrist pin? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 10-11-2011, 03:42 PM Thread Starter
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Anyone ever deal with a wrist pin?

I recently purchased an 02,750 with a little over 4,600 miles. It has what I call a rapping sound coming from the upper portion of the front cyl. The compression runs about 160-165 in both cyl's. It seems the most popular reason for this problem is attributed to the acct's. The first thing I did was convert them over to manual using the original housings. The change made no difference. To eliminate the valve train, I was able to remove the rocker arms and hla's, then reinstall the cams and cam cap without removing the engine.
I then ran the engine on the rear cyl. Because of the air shooting from the plug holes, it was hard to distinguish the sound, but it did seem to go quiet a couple of times. I'm thinking it is the wrist pin, but before pulling the engine, I thought I would check to see if anyone has had any dealings with them. I'm going to bleed the hla's, reinstall the top end, and if the rapping is still there, I'm going for the wrist pin.
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post #2 of 4 (permalink) Old 10-11-2011, 05:58 PM
Crap, I WAS in 5th gear.
 
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Quote:
Originally Posted by dodger View Post
I recently purchased an 02,750 with a little over 4,600 miles. It has what I call a rapping sound coming from the upper portion of the front cyl. The compression runs about 160-165 in both cyl's. It seems the most popular reason for this problem is attributed to the acct's. The first thing I did was convert them over to manual using the original housings. The change made no difference. To eliminate the valve train, I was able to remove the rocker arms and hla's, then reinstall the cams and cam cap without removing the engine.
I then ran the engine on the rear cyl. Because of the air shooting from the plug holes, it was hard to distinguish the sound, but it did seem to go quiet a couple of times. I'm thinking it is the wrist pin, but before pulling the engine, I thought I would check to see if anyone has had any dealings with them. I'm going to bleed the hla's, reinstall the top end, and if the rapping is still there, I'm going for the wrist pin.
My '01 cam chain stretched at about 5,000 miles. Never has been completely quiet, regardless of how much force I put on the manual tensioners. Just something to keep in mind. Are you sure you put the APPROPRIATE amount of torque on your MCCTs? Also, you could try replacing the upper tensioner springs, or shim them with 2-3 flat washers.
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post #3 of 4 (permalink) Old 10-11-2011, 06:11 PM
If only it had 6th gear..
 
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X2 with Kelly2001. It seems unlikely that it's wrist pin slap. Possible but I just don't think so. You weren't able to run that engine without the front cam chain in there right? So even though you had the rockers out, you still had the chain running. I'd just hate to see you go thru taking the engine out and finding it isn't the wrist pin. I thought it was the same thing on mine believe me. Then I tried the grambo trick and that got me thru until I did the "wib" conversion this year. she still talks a little but I think it's the nature of the beast and I'm fearful of putting too much tension on the chain so I let her talk. More of a wisper now anyway, lol. Good luck

Dave

Mods:
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Added stuff:
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post #4 of 4 (permalink) Old 10-12-2011, 11:05 AM
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VN750s are not known for that problem. I would recommend replacing the tensioners with proper tensioners from TOC. I Had a terrible racket coming from my engine at only 15,000 miles, I checked the ACCTs, did the "Grambo trick" noise went away, so at last I knew what it was. But it came back right away. I ordered a brand new set of Kawasaki ACCTs, they lasted 10,000 miles until the noise came back. I finally went to the TOC manual tensioners, 45,000 miles ago, and have had no problems since. I don't know how a cam chain could stretch (wear actually) that much in 5000 miles, unless it was run for most of that with loose tensioners. I barely had to tighten my MCCTs when I installed them, the noise went away, and never came back. I would suspect piston slap (tapered bore) or even a con rod bearing before a wrist pin, they are one of the most trouble free parts in most engines.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
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