help:

I have an older B&S 6hp with a 1" threaded shaft. Are drive clutches made specifically for threaded shafts, or do I need to have it ground smooth? Can I just cut a keyway and drill and tap the end of the shaft? Oh, and could I turn the shaft down to 3/4" or should I leave it at 1"? I'm thinking...

I just bought the engine not too long ago and took it out of the box and put it on a mini bike and i tried to start it but it wouldnt spark. It sparked for a little bit but quit . i replaced the spark plug and its still not getting fire. Has anyone had this problem? Can anyone please give me...