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Gilera runner 200-misfiring at speed?

The bike starts and runs ok but when I open the throttle more than 30%, the bike misfires and only once I shut the throttle down again does it go ok.

I have replace the HT lead and spark plug-any idea what I should try next?
Peter Anderson, May 2009
try taking off the carb and cleaning the jets using a can of carb and choke cleaner and an air compresspr to blow the debris free but first i would replace the gas line from the tank to the carb i had the same problem on my 4 wheeler

logan, March 2010
link Click here to see other fixes for Gilera Runner 200.