My 1980 C70 Passport has been a headache, I have put new fuel lines from the tank to the carb. Put a new carb and air cleaner on him, but the little bike still has a flat spot. I tried adjusting the idle screw and pilot screw, but nothing works, he idles fine, first gear runs good until under strain, he pops and cracks when you try to give him the fuel quickly, reduce throttle and he comes back and increase throttle slowly and he's OK. Once you get pass that mid range and you're at full throttle, the bike runs great. Can anybody help? Thanks.
Hey, guy with the flat spot problem. I do believe is is a spark issue. I have had this happen, and it only took a cleaning of the contacts in the magneto and some wd40 in the spark plug hole, and it fixed it. Maybe even a spark plug. If the wire is touching or cracked, it could jump under lots of acceleration.
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