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Discussion Starter #1 (Edited)
This forum is amazing, i just have a small question. I just finished my rebuild, ive been riding it a bit, only has about 5 hours on the engine, ive read up that they are a little noisy, especially with the valvetrain, i try to send a video of it idling, my father is saying it sounds fine but i just need to be sure, i put so much work into it and I don’t want it to blow, the sound is a loud metallic kind of “slap” its not piston slap or anything like that, it’s definitely on the stator side, and where the chain is. Im just wondering if i just need a new timing chain or something else is at blame here. Also there is like a metal gliter in my oil. I thought it was just the new gears wearing but now it seems like it would be from the chain hitting the head, its aluminum glitter. Thanks all!
 

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that sounds a bit noisy. Is that warmed up or cold? when did you adjust and what did you adjust your valves to? did you adjust them cold or with engine warm. you say just finished rebuild but u state u may need new timing chain? what parts were replaced? is it stock or is there aftermarket parts in that engine? cam, piston, valve springs? just need more information
 

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Discussion Starter #4
that sounds a bit noisy. Is that warmed up or cold? when did you adjust and what did you adjust your valves to? did you adjust them cold or with engine warm. you say just finished rebuild but u state u may need new timing chain? what parts were replaced? is it stock or is there aftermarket parts in that engine? cam, piston, valve springs? just need more information
my bad about that, all stock, it had aftermarket things on it, “cosmetics” engine itself was stock besides an alba racing exhaust, 2nd gear blew so i had to split the cases, nothing has been done to piston, valves cam, all that, besides new rings, I haven’t checked the valve clearance but like you said this is very noisy, now i do have an after market timing chain tensioner. I just read up and heard bad experiences about the automatic ones, so i like to play it safe with manually adjusted tensioner. (The engine is also at running temp) about 213-220)
 

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Master of the Electron
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1) The 660 engine is noisier (more clattery) than my other quads.

2) I have NEVER heard of any issues with the stock, properly installed, auto-tensioner.

3) You can measure chain stretch by properly examining the auto-tensioner... don't know if yours can help you there. I'd go back to stock.

4) normal operating temp is below 208F
 

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Discussion Starter #6
1) The 660 engine is noisier (more clattery) than my other quads.

2) I have NEVER heard of any issues with the stock, properly installed, auto-tensioner.

3) You can measure chain stretch by properly examining the auto-tensioner... don't know if yours can help you there. I'd go back to stock.

4) normal operating temp is below 208F
i went to check the chain tensioner about a week ago, the stock one, I don’t know for sure if i did it right, but it was all the way out, like it could not extend anymore, i left it like that and installed it, it had a decent amount of tension on it, this sound is almost at the bottom end, around the stator. I was reading alot of forums on the clatter i just want to make sure this isn’t “too much” clatter. It does sound metallic like. But i trust you on the stock tensioner. Ill go back to it and see if anything changes, thank you for the responses too
 

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Master of the Electron
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NOOOOO! You must take the center bolt and spring out, then release the pawl on the tensioner so it compresses to minimum length, THEN install it and finally put in the spring and center bolt. It will now auto tension. What you did (installing fully extended) is sure to cause noise and damage. Fix it NOW! This has been known to actually break the cam in half!

Then run it a bit. Remove the center bolt and spring, then remove the tensioner and see how far out it is... if not near the end of travel chain is ok. If end, chain needs replacement.

Then, follow the top paragraph instructions to re-install the tensioner (after everything else has been installed.)
 

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Discussion Starter #8
NOOOOO! You must take the center bolt and spring out, then release the pawl on the tensioner so it compresses to minimum length, THEN install it and finally put in the spring and center bolt. It will now auto tension. What you did (installing fully extended) is sure to cause noise and damage. Fix it NOW! This has been known to actually break the cam in half!

Then run it a bit. Remove the center bolt and spring, then remove the tensioner and see how far out it is... if not near the end of travel chain is ok. If end, chain needs replacement.

Then, follow the top paragraph instructions to re-install the tensioner (after everything else has been installed.)
WILL DO sorry about that, rebuilt the whole thing I can’t afford to snap the cam, thanks for the advice ill let you know how it goes, and if it’s stretched would it be making that kind of knocking sound? Im also going to adjust the valves while i am in there
 

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I just changed my timing chain and cam sprocket, with the gasket it cost 100 Canadian for the Original Yamaha one, I’d replace it , it sounds like mine did, my chain was stiff and actually wouldn’t bend on quarter of the links, I’d replace it
 

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Discussion Starter #10
I just changed my timing chain and cam sprocket, with the gasket it cost 100 Canadian for the Original Yamaha one, I’d replace it , it sounds like mine did, my chain was stiff and actually wouldn’t bend on quarter of the links, I’d replace it
im planning on doing it, its way over due, what was the easiest way to do it? Do you have to remove the whole head or can you feed it through?
 

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Discussion Starter #11
UPDATE: i got the flywheel off and i checked the chain. It has more than enough tension i have a video, but it has zero slack, i think its a bit over tensioned. Im still going to replace it but could this issue lie deeper inside? For example piston? Wrist pin? Im also finding metal glitter and a kind of sheen on the oil, a sliverish color could this be from the piston slapping?
 

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Master of the Electron
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Dir you remove and properly replace the tensioner? If not it is way over tensioned.
 

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Discussion Starter #14
Dir you remove and properly replace the tensioner? If not it is way over tensioned.
the manual tensioner is still on after i get this new chain im removing it, its been finicky and I don’t trust it, i have the stock one and i am installing it with the new chain, i also know how to reset the tensioner too, but would an over tensioned chain be making that sound or would out of spec valves be the issue? Im still finishing up the exhaust valves, they are a pain to get too but I don’t really know what else could make such a loud metallic noise
 
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