it is more than likely that the pilot jet is blocked.This is the black plastic jet that is underneath the idle screw. The easiest way to tell is to start the engine as normal, let it heat up a little then pull the throttle lever. If the jet is blocked the engine will nearly stall.
Cleaning it is really simple and once you have done it once correctly you will be an expert. Remove the black plastic idle screw. With a wide blade screw driver or long nose pliers simply lever the black plastic pilot jet from the body of the carb. there will be some resistance at first but it should pop out after the initial resistance. the only thing to be careful of is the small seal at the bottom of this jet. It should be intact and located in the groove at the bottom of the jet.
Cleaning the jet is as simple as applying a liberal amount of carb cleaner up the bottom of the pilot jet. If you have access to an air line use this also to clear and blockage.
If carb cleaner and air does not clear it use a single wire off a wire brush and poke it up the bottom hole then use carb cleaner and/or air as above. The only caution with this is to use a small diameter wire as forcing too large a wire can enlarge the hole (apparently) and fall foul of the scrutineers!!
reassemble the jet into the carb body - it does take a little pressure to get it seated. then screw in the idle screw and adjust until revs are around 2000 (or when the clutch starts pinking).
Keep me posted how you get on.
Graeme
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