thanks for the reply, I just rode it for 15 min. it"s 90 deg. outside, and it runs perfect, not stalling, go figure. I find it hard to believe that putting in the right plug could make that much difference. that and putting a new clear gas line. it seems to be idling kind of fast, but there is no idle adj. screw just the mixture screw on the carb. is there any other way to adj. idle speed?