400ex rattle at 1/2 throttle - Honda TRX Forum
 
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post #1 of 6 Old 11-11-2019, 05:44 PM Thread Starter
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400ex rattle at 1/2 throttle

I replaced timing chain, tensioner and clutch a little while ago. After adjusting the valves and starting it up I noticed a weird rattle at around half+ throttle that is in all gears and neutral, even if I hold the clutch in. Although when I tried it out it seemed to run fine, I know the rattle can’t be good, especially since the only thing I changed were parts inside the engine. I tried to diagnose where the sounds was coming from which I think is somewhere in the engine. I just don’t know where...
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post #2 of 6 Old 11-11-2019, 07:09 PM
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Was there a rattle prior to tearing it apart?
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post #3 of 6 Old 11-11-2019, 07:11 PM Thread Starter
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No there was never a rattle before other than the loose timing chain, that’s why I’m assuming it’s something in the engine.
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post #4 of 6 Old 11-11-2019, 08:40 PM
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Did you have the cylinder head off?
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post #5 of 6 Old 11-11-2019, 09:20 PM Thread Starter
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Yes I had the cylinder head off to replace the timing chain. Do you think it could be the cam?
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post #6 of 6 Old 11-12-2019, 06:10 PM
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You don't have to remove the head to replace a timing chain, but doing so opens up the possibility of the cam chain guide not being properly installed or the pivot bolt on the tensioner may have been left loose especially since the noise comes and goes.

Let us know what you find out.
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