backfire

Have a greyhound 196 motor on a mini bike. It will not start. Has fire and fuel. Cleaned plug, changed gas, cleaned carb bowel. It backfires as if out of time. Won't attempt to run. Any ideas or is out of time? Appreciate any help.

I just bought a 4K generator from Northern about three months ago, and was starting the thing just as a matter of good course. Anyway after pulling WAY too much I got it to run as I fiddled with the choke. From full to half and back again over and over, I got it to run for several...

hey guys im building a 5 hp flat head. ive got it all together, arc billet rod, comp camps billet lifters and stock wide range cam, little port work and a hl 129 tilly (vertually the same carb as a 357a only with a choke) now ive got the upgraded pullstart the cup style. the motor is very tight...

i got this mini bike and never actually started it and today when i tried to start it, it backfired is that a good sign?? what should i do???