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View Full Version : 300ex head noises?


NikNacs67
08-04-2006, 04:32 PM
My brother brought his 300ex over to rethread a few holes on the cylinder. But the day he brought it over we started it up and notice a really loud clattering inside the head/cylinder area. The clattering went away at 1/2+ throttle in neutral. I tore it down suspecting that maybe it jumped out of time and the valves were hitting the piston but that wasn't the case. So does anyone else have any ideas? Visually, everything looks great and it was just rebuilt 8 months ago.
DieselBoy
08-04-2006, 05:05 PM
are the valves adjusted right? those will make a ticky clatter if they're out of adjustment. it could be piston smack or nothin..but if it hasn't had much use i can't see it being that...
NikNacs67
08-04-2006, 05:16 PM
Valves are right in adjustment.
DieselBoy
08-04-2006, 05:17 PM
How's the cam chain?
EX lvr
08-04-2006, 05:55 PM
spark knock? try sum higher octane gas
2muchquad
08-04-2006, 10:21 PM
I bet your cam chain is stretched.;)
Mx_523
08-05-2006, 12:20 AM
Originally posted by 2muchquad
I bet your cam chain is stretched.;)


I'm going with him. Pull the top cover off and see how much the cam chain can go over the sprocket. It should barely go over the teeth.
NikNacs67
08-05-2006, 06:06 AM
If thats the case im gonna be pissed. The cam chain is 30 minutes old. I replaced it last month. I'll check it out tho.
DieselBoy
08-06-2006, 12:14 AM
It's probably not the chain, probably your guides/tensioner if it it were coming from there.
400ex is money$
08-06-2006, 10:57 PM
same thing happened to my friend it is with the valves