Backfire

What year is it? I know if you shear the key on the flywheel it will run horrible and back fire. Throws timing off. Have you checked that?
 
What year is it? I know if you shear the key on the flywheel it will run horrible and back fire. Throws timing off. Have you checked that?


Right now I don't have a key switch it broke so I took it off just order a new one it backfires when I don't have it on chock but when I have it on chock it run fine but doesn't stay on when on neutral its a 2000
 
Right now I don't have a key switch it broke so I took it off just order a new one it backfires when I don't have it on chock but when I have it on chock it run fine but doesn't stay on when on neutral its a 2000
Have you checked all connections, ground? Does it still have the TORS unit?
 
It sounds like you either have a massive air leak which is creating and extremely lean mixture, or a blocked pilot jet!