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Author Topic: Can you weld a cam sprocket?  (Read 1728 times)

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Offline shizzomynizzo

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Can you weld a cam sprocket?
« on: March 21, 2012, 08:05:37 AM »
My buddy bought some cams from a junk yard for his bike. One of the cam sprockets is cracked.

The guy refunded his money (well half) and told him he could weld it and run as is.

Does that sound right to you? I am not sure I would want a welded up cam sprocket spinning at 8000+ revs.

What do you guys think?
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Offline MRieck

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Re: Can you weld a cam sprocket?
« Reply #1 on: March 21, 2012, 08:15:22 AM »
It would throw the balance off. Sprockets are plentiful....what bike is it?
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Offline shizzomynizzo

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Re: Can you weld a cam sprocket?
« Reply #2 on: March 21, 2012, 08:16:40 AM »
Quote from: MRieck on March 21, 2012, 08:15:22 AM
It would throw the balance off. Sprockets are plentiful....what bike is it?

It's a kz650
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Offline MRieck

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Re: Can you weld a cam sprocket?
« Reply #3 on: March 21, 2012, 02:10:49 PM »
There are a few on ebay. While the actual balance might not be a big deal the failure of a sprocket certainly will get your attention
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Offline lucky

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Re: Can you weld a cam sprocket?
« Reply #4 on: March 21, 2012, 03:34:57 PM »
Quote from: shizzomynizzo on March 21, 2012, 08:05:37 AM
My buddy bought some cams from a junk yard for his bike. One of the cam sprockets is cracked.

The guy refunded his money (well half) and told him he could weld it and run as is.

Does that sound right to you? I am not sure I would want a welded up cam sprocket spinning at 8000+ revs.

What do you guys think?

I just saw your ad on Ebay for motorcycle parts!
(4shizzlemynizzle)

We would need to see the crack and its location.
It could be TIG welded if done properly.
You CANNOT weld it with a 110V wire feed!!
Also the cam only turns 1/2 the speed of the crankshaft.
It would need to be checked for flatness and checked for non visable cracks.
If it is cracked between teeth all the way to the outside edge I would not weld it.
They are easy to get and it is probably not worth it in the long run.
« Last Edit: March 21, 2012, 03:39:20 PM by lucky »
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Offline shizzomynizzo

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Re: Can you weld a cam sprocket?
« Reply #5 on: March 21, 2012, 05:27:13 PM »
Quote from: lucky on March 21, 2012, 03:34:57 PM
Quote from: shizzomynizzo on March 21, 2012, 08:05:37 AM
My buddy bought some cams from a junk yard for his bike. One of the cam sprockets is cracked.

The guy refunded his money (well half) and told him he could weld it and run as is.

Does that sound right to you? I am not sure I would want a welded up cam sprocket spinning at 8000+ revs.

What do you guys think?

I just saw your ad on Ebay for motorcycle parts!
(4shizzlemynizzle)

We would need to see the crack and its location.
It could be TIG welded if done properly.
You CANNOT weld it with a 110V wire feed!!
Also the cam only turns 1/2 the speed of the crankshaft.
It would need to be checked for flatness and checked for non visable cracks.
If it is cracked between teeth all the way to the outside edge I would not weld it.
They are easy to get and it is probably not worth it in the long run.


I am not selling anything on ebay...so don't think it's me!

The crack is not all the way across...from the center of the sprocket about half way to the edge. It is flat, and not bowing out or anything. I just never heard of welding one up before... thought the guy was crazy.
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Offline MRieck

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Re: Can you weld a cam sprocket?
« Reply #6 on: March 21, 2012, 06:10:57 PM »
I have not seen a cracked sprocket before. I have seen cracked/broken cam mounting flanges BUT they are cast iron and much more brittle.
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