hey guys i just bought a new set of mofoco 041 heads and put them on my 1915 and now it wont start it will crank over and will back fire every once in a while. any help would be great thanks in advance

Check firing order,timing,valve setting and after that start looking for intake leaks for air.sounds like its out of time.is the heads all you changed? Chad

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NOW GAS IT!!!!!

I bought a set of mofoco heads a while back and put them on my 2386. When I tried to start it it would crank but made a popping sound and blew smoke out from the cylinder tins. I took the heads off and noticed that the area where the cylinder seats against the head was cut in to the cooling fins. I put head gaskets in and helped but still leaked bad. I would do a compression test to and maybe a leak down test just to see if you have the same problem I had. When I called them to find out what to do to fix the problem they told me all their head that was cut for 94mm was like that and they never leak, i went with a CB head and fixed the problem after nearly having to get a plane ticket and go to mofocos shop in person to get my money back. They gave me a huge run around about it was builders error. good luck with your motor and maybe your not having the problem I had.

i got it running thanks guys for the help but all it was is my buddy crossed two plug wires thanks again