The clutch gave me a lot of trouble too, but it has to be tighter than you think it should be, take all the slack out of the cable, on vs off should only a matter of a half an inch...
Also the cable that comes with the kit is pretty crappy/frays at the ends. Steal a standard brake cable from another bike if you can.
Good for you . I remember when I first got mine running. What a thrill to go speeding along... Great!!! How's the clutch working? I hope its doing ok. Well report back on your adventures and keep on rollin......Tom in WV