Normal wear on cam gears? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 03-03-2012, 07:46 PM Thread Starter
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Normal wear on cam gears?

Ok, my bike started make allot of noise on the rear cylinder, tore down to find out what was going on, found that the rear acct had failed and cam chain stretched and jumped time damaging both cam gears. I was lucky and it does not look like the piston hit the valves. I found some used cams on ebay and messaged the guy about them, they have some wear marks on the teeth is this normal, would it be ok to use these with a new chain? you can see the pics on ebay, search for vn750 cam. it wont let me post a link here. any help would be appreciated.
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post #2 of 3 (permalink) Old 03-03-2012, 09:22 PM
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I found several VN750 cams on eBay. As an auto mechanic, I would never put an engine back together with used internal parts other than in a serious emergency. Even if they look good, you have no way of knowing what kind of stresses used parts have been subjected too. I always start with a block and heads, and if they pass my visual inspection and all the measurements check out, I have them hot tanked and magnafluxed to check for cracks. Then I have all the machine work done before installing new parts.

The cams you are talking about may very well work, but for how long? Consider the amount of labor it takes to install them, and the consequences if they fail. I guess it comes down to a lot of things, the overall condition of the bike, how long you intend to keep it, and how you intend to ride it (long highway trips or mostly locally), how much your time and labor is worth, and what the bike means to you. If the bike has high mileage or shows more than a tiny bit of wear, I'd go ahead and use them. And also look for any other signs of damage that a loose chain might have caused.

One of the problems I have always had with the Vulcan engine is it's overly complex design, and the price of new parts. To me, this makes it a disposable engine. If you are just trying to get some more miles out of it, then decent used parts make sense. When you install them, make sure you check the clearance between the cam journals and the head. If it is too loose, the cams are unusable. Also check the cam lobes themselves for wear.

Oh, and I suggest some genuine TOC manual tensioners. I noticed someone is trying to sell converted ACCTs on eBay as manual tensioners. If you want to go that route, convert your own. It's a whole lot cheaper.

I am a motorcyclist, NOT a biker.

1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #3 of 3 (permalink) Old 03-03-2012, 09:49 PM Thread Starter
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Thank you for the help. I too am an automotive mechanic and was on the fence about using used parts, especially as hard as it is to change these out. guess i will just have to spend the extra and order new cams. I already ordered the toc manual adjusters that i will put on when i put it back together. Also got to do the stator, r/r, and battery since they are all shot as well. thank you again for the help.
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