Timing chain issue! - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 8 (permalink) Old 02-01-2011, 03:06 PM Thread Starter
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Timing chain issue!

Hey guys ,
Was wondering if anyone has had there timing chain come off the gears on the cam and crank?I was running like half throttle and rhino just sut down well when i started tearing in to motor found that had a stuck valve which it probably bent and cam was not spinning.Took valve cover off and seen that timing chain was off the gear on the cam and pretty sure its off on the crank also!
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post #2 of 8 (permalink) Old 02-01-2011, 03:52 PM
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I'd be looking into the cam tensioner... You may have developed too much freeplay in the chain and it came off. I'd suspect that before a crank gear issue. I know on the higher output 700 motors, having the gear keyed or welded is a good idea... Age/stretch and poor tension will cause freeplay in the chain, could spin itself off.
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post #3 of 8 (permalink) Old 02-01-2011, 04:01 PM
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When I have my tensioner in, the chain is super tight. Can't see it ever coming off...
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post #4 of 8 (permalink) Old 02-01-2011, 04:03 PM
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That's true Bob, that's what it's there for. But on the other hand, if the tensioner backs off... so too does the pressure on the chain.
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post #5 of 8 (permalink) Old 02-01-2011, 04:06 PM Thread Starter
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I just put this all back together after putting new middle drive gear in.I am thinking it is the tensioner and praying it is lol.Is there a way i can check my tensioner?
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post #6 of 8 (permalink) Old 02-01-2011, 04:16 PM
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Paul, if you have the service manual for your Rhino, it shows you the proper way to check the tensioner. Basically it should slide in and out nicely without catching. If it catches, replace it. But if you're looking at reasons for the chain coming off, and finding no other reasons, I'd pretty much suspect the chain tension as the issue.

Also, what kind of shape are the chain guides in? Are they wore down or did they suffer damage from the chain coming off? Might want to look at that too.
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post #7 of 8 (permalink) Old 02-01-2011, 04:27 PM Thread Starter
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I have been reading alot on here when i did a search about why chain come s off and that seems to be the deal tanks for your input!,I only took valve cover off so far gonna pull the motor now cause i no i need to change valves and just wanna check bottom gear also so i will let you know how everything looks when i feel like pulling the motor out lol.Motor been running awesome to. just hate that something like that to happen!Thanks for you input.
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post #8 of 8 (permalink) Old 02-01-2011, 06:38 PM
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Put a 700 raptor tensioner on it. They don't back off.
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