if it is the ignition problem, your needle will bounce around....id seriously check that before you pull the motor, or chain off.
sorry, but i havent read through all the posts, im just posting off your first post.
i was refering to the ballasts resistor, you need to splice the wire on the right.
http://www.google.ca/imgres?q=wire+...tbnw=213&start=67&ndsp=11&ved=1t:429,r:1,s:67