iv had the carb off mate, cleaned the jets and whatnot.. cleaned it all.
yes, it did rev quite good when it wouldnt move, but more pull of the throttle it started to move slightly then it would start and the cut out as soon as u touch the throttle...
and i havt changed anything since, just had it all off and gave it all a clean.. and i also checked the belt, and its still ok, on there as it should etc...
some one said it might be the bottom end oil seal ?, is that bad, or could that just be a load of pony lol