Bultacobob wrote:Hi, Have done compression test it is about 170psi is that OK Mike or to high? The prower vale seems OK and is moving freely. The bike has only done 4000 miles the cylinder and piston look pretty good, no marks, score lines etc.

That sounds fine to me.
Mike

+1

hi mate,
make sure your chain is adjusted correctly, to lose and it will rattle it will take up slack with power on and slowing down so may not rattle then. also make sure your chain and sprockets are in good condition.
may not be that but its an easy thing to check first.
mine will rattle when the chain starts to go lose.
good look.

Even a bad supply of fuel can cause a bad pinking rattle, as can a needle being too low in the carb.

helisupp wrote:Even a bad supply of fuel can cause a bad pinking rattle, as can a needle being too low in the carb.

Good point, check the plug for colour.
Mike

dillondog wrote:hi mate,
make sure your chain is adjusted correctly, to lose and it will rattle it will take up slack with power on and slowing down so may not rattle then. also make sure your chain and sprockets are in good condition.
may not be that but its an easy thing to check first.
mine will rattle when the chain starts to go lose.
good look.

+1 what a sexy sound it is haha