hurstie

just purchased the bike a month ago 2008 model ,ran fine first 2 outings of a couple of hours,guy i bought it from had the valve clearances checked just before he sold it not sure if it was done correctly ????.everything else you mention fine.

The poor running does not happen until the engine gets hot,its un ridable as the engine coughs, splutters and backfires up to about 1/3 throttle.starting the engine once its got to this state is a dangerous operation as it violantly kicks back through the kickstart.Once the engine is cold it starts easily and runs fine until hot again ????? ANY IDEAS WOULD BE MUCH APPRETIATED