Hey guys. Noob to motorized bikes. But have learned a vast amount just to get it to run. I have an 80cc china girl. Stock everything with the exception of NGK B5HS spark plug. Does 24mph solid, but rare moments I top out at 27mph. Which I did with stock EVERYTHING, but at bone rattling rate. It stop running for awhile. I don't know why. But I got it running and she now tops out at 24mph no problem. But now it seems the cam shaft arm is barely pushing the push pin to engage clutch/plate. Unless its pushed so far in that it sits under the carb before clutch engages and still feels weak as if cam arm or bucking bar has wore down. But neither has. It use to start to engage when cam shaft arm aligned parallel with motor. Now it has to be pushed/pulled in so far it sits directly under the carburetor. Correction, clutch doesn't fully engage at all. Only enough that u can pedal on gear 1 to fire up engine. I've notice clutch assembly has no spring between the drive gear and plate that flower key holds in place! Please help...thanks in advance!!