Where the throttle cable enters the carbie there are a couple of wires that short out (stop the mower) when the throttle
is pulled right back.When these touch the full spark is not achieved. The insulation/seperators break down so pull out one
(black wire into rubber boot in my case) and insulate it so it can never touch anything again .To stop the mower simply
turn off the fuel and wait for it to be used up (about 40 secs).
After several years of battling to start it , it now starts first time!
Pete Mowerman, October 2007