[alltractoredup]

I have a cub 3205 with kawasaki fd620d.

I have not been able to get it to run right...wont rev all the way up

Today I took my Tiny Tach to see what the RPMs are and then I became confused....

When I hooked one wire to the spark plug and one to ground, the engine ran perfect!!!!

I unhooked the wire from spark plug and back to running poorly

What is going on???