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Old 05-27-2011, 03:40 PM   #1 (permalink)
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Default 2004 ltz 400 valve noise

I just rebuilt a 400z that ate both ex. valves. I just fired it up and there seems to be excessive vave noise. I put the valve shims back in it that was in it before it lunched. My customer only knows how to ride it wide open and nothing else about the bike(ATV) Just for anyones help, the nickel cyl can be sleeved if you can find a machinest that will do it. I had
a little trouble finding one.
Any help will be appreciated Guys
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Old 05-27-2011, 04:09 PM   #2 (permalink)
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Please don't tell me you are his mechanic!

It could come from a stretched cam chain.

I think that the shims that were in before might not be the correct thickness needed if the head got a valve job or the valves were at least lapped. They should be measured and shimmed accordingly.

Did the exhaust valves hit the piston?

I'm no expert so I'm just guessing. But if you are a mechanic you should know this?
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Last edited by chinoduca; 05-28-2011 at 05:33 AM.
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Old 05-27-2011, 06:31 PM   #3 (permalink)
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Quote:
Originally Posted by chinoduca View Post
Please don't tell me you are his mechanic!

It could come from a stretched come chain.

I think that the shims that were in before might not be the correct thickness needed if the head got a valve job or were at least lapped. They should be measured and shimmed accordingly.

Did the exhaust valves hit the piston?

I'm no expert so I'm just guessing. But if you are a mechanic you should know this?
+1 on this.

sounds like you pulled the EX valves out and through some new ones in and expected it to work. how many clicks were left on the tensioner? Chino is right...could be a stretched chain. did you have to do any head work? cut the seats? lap the valves? or like i said, did you just throw them in there? did you put stock valves back in? any cams? always check and make sure you put the CORRECT shims in place.
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Old 05-27-2011, 09:39 PM   #4 (permalink)
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You really need to shim the valves to spec, there's too many variables and the shims that were in it may not be the correct ones. You may have too much clearance, your timing chain may be stretched. Did you reset the tensioner? How many clicks were left on it?

I completely agree with Hughes and Chino on this. It sounds like you just threw parts at it in hopes of a quick fix.
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Old 05-27-2011, 11:40 PM   #5 (permalink)
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OMG.....customer?
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Old 06-01-2011, 09:16 PM   #6 (permalink)
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If you used a new top end gasket kit and it came with 2 donuts to seal the exhaust make sure you use them both
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