I am still experiancing what can only be described as a flat spot type of pinking , when accelerating gently or under a load if in too high a gear.
Sounds realy crap , but when I really gas it up the rev band she just about takes off and doesn't miss a beat. Strange ??
Already changed the air filter, fitted a platinum plug, fitted new O ring and sprockets 13/45
Any ideas , or should I just leave it at leisure trail and let them sort it?

Help , it is doing my head in !!!

If it's a strange pinking / knocking noise - it's normal. Some CRM's do it, others don't. Nobody seems to know the exact cause but it's nothing to worry about (if it is that noise others get as well !)

Sounds familiar, just change down earlier. 8)

Mine does it bigtime, but I just avoid it by changing up later or by accelerating a bit harder?

I read somewhere that by fitting the Mk.3 / AR chain guide that has a sort of fin on the side, this can help? I'll let you know as I've got one coming!!

Others say it could be the powervalve chattering?

Is it the balancer shaft bearing perhaps because I've read elsewhere that this can go, making it noisey but doesn't affect performance??

Anyone?

Beanie

my advice is to rev it out-remember its a 2 stroke and it is designed to be revved HARD. If you were to ride it like a 4 srtoke then you will be more likely to run into all sorts of trouble. These bikes dont have bags of low end tourque to pull you out of trouble, get the engine singing.

worked for me beanie, well chuffed.

Yea mine does it to
i always thought that it was the chain vibrating up
and down. but i could be wrong

those boys at LT have done it again.
as soon as I mentioned my clatter from the old dear at low speeds under load , they took £40 from me in exchange for a later style black rubber chain guide with a sharks fin as fitted to the AR.
I fitted it in quick sticks and now have a bike which is even better to rideand is most of all Clatter Free

many thanks to LT , \"Mi ducks\"

I was gonna try a 2 stage reed to if that helped the over run, but having to pay for bits to replace the broken bits from the theft have put paid to that, got some new sprocket bolts instead as I have to cut 1 off to fit my 44t sprocket, maybe next year...