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954 with rattle sound at 4000rpm and up

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954 with rattle sound at 4000rpm and up

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  #1  
Old 06-13-2018, 08:42 AM
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Join Date: Aug 2015
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Default 954 with rattle sound at 4000rpm and up

Hi all, I've just bought a 954 and rode it home with ear plugs in, after riding it the next day without ear plugs I can hear a light knocking noise at 4000rpm and up.
if stationary and revved up there is no noise and the engine sounds perfect.
If it was cam chain rattle surely it would do it when stationary also ?
The drive chain for the rear wheel is lubed and set at the correct tension.
I have checked for loose nuts bolts and checked the spark plugs are tight but these things would make a noise when stationary.
Chain and sprockets are in excellent condition.
I'm thinking it's the cct at fault but why can't I only hear the noise when moving ?
 
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  #2  
Old 08-20-2018, 11:11 PM
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Join Date: Aug 2018
Posts: 1
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The automatic cam chain tensioner assembly used to go bad Honda engines of that era. My 92 F2 and 06 F4i both had that issue. The assembly houses a spring and piston that is supposed to keep pressure on the internal cam chain tensioner and take up any slack in the cam chain. The piston would get stuck and the symptom was a rattle that started at about 4K RPM. I dont know if this plagued the 954s as well or not.

The cam chain tensioner assembly part has been superseded with a newer design. If that is your issue it is an $85 part and about three hours of billable labor.
 
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