Arnold wrote on 05/15/13 at 06:27:08:Man, I remember as a kid on a dirt bike, throttle cable broke in the sleeve, stuck at full throttle. So here I am stuck on a dirt bike going full speed with no way to turn it off, no battery, no key, no kill switch. Had to pull the spark plug wire, man what a shock you get from there...
When I met my wife she had a Suzuki 50 step through, a 2-cycle single. Her younger brother was racing go-karts on fuel (methanol+ klotz + nitro). One day he borrowed the bike, which had no gas in it so he put fuel in it, and went to the store for something. He did not tell my wife he had done this and she picked me up after work on a real hot day.
She mentioned it was not running right and that she had to keep it reved up or it would stall. Figuring that she was burning out the centrifugal clutch by doing that, I took over the driving, intending to put it out of gear and keeping the revs up. I stopped at a light, put it in neutral, gave it a little gas, and it went up to max RPM, just screaming.
I turned the key off and it kept screaming away. I pulled the plug wire and got a hell of a jolt and burning my fingers, and it kept screaming, starting to make self destructive noises. It then occurred to me that it was deaseling, and I pushed it, still screaming, into a gas station. I asked for a plug wrench, but the stupid mechanic would not lend out his tools. The bike is still screaming away, and has gathered a small crowd of mechanics and passers buy.("Man, I haven't smelled that since I went to the drags!") The mechanic finally pulls the plug and the bike stops.
He puts the plug back in (cross threaded) and I push it the 5 blocks to her place.
Her dad fixed it. (major bore out, new piston, push rod, rings, head, and clutch)
We drove it for 2 years after that.
She got her (unintentional) revenge though. She borrowed his 175 dirt bike, (2 stroke) which had a separate oil tank, for a weekend. She put gas in it but forgot all about the oil. Bore, piston and rings.
I've had some "screaming its guts out" incidents with two strokes over the years.
I think the best thing to do is to suck it up, pull the clutch lever in, mash it into second, and feather the clutch out. The engine should die then.....
However, in your case (centrifugal clutch), kicking it into gear may have triggered the mother of all loop-outs!