Big bore carb installed, tick over low to begin with, have to keep revs up. rides fine, pulls well, but loses power, backfires and finally cuts out when at full speed which seems to be around 65mph. Any ideas? I'm thinking the cdi, but looking at 45-139 quid I would rather try not to keep throwing money at it. Also has variator and adjustable clutch kit.
SOURCE: carb tune up gilera runner 50
on the carb you will find 2 screw one will be quite far in than the over thats the one you adjust this is the mixture screw which controlles the air and petrol together unscrew it say 1/4 a turns at a time and see if it improves if it gets worse screw it the oposite way and see if that improves good luck buddy
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