Good luck on your repairs, Jdehawk!
Two-stroke engines sometimes overheat internally, with the piston expanding to the point of seizure in the cylinder; four-stroke engines seldom seize at all The countermeasure for a seized engine remains, immediate clutch release.
Thus, a syndrome of clutch hand fingers making grasping motions anticipating this emergency manuever developed, known commonly as, "two-stroke twitch."
Again, engine seizures remain fortunately rare for four-strokes, but--good thing to keep in mind what to do, should one ever experience this phenomenon.
(Happened once to me; at about 55 mph, riding straight-and-level (fortunately!) on a two-stroke Tohatsu; asphalt, mild traffic . . . able to pull clutch lever after some yards of rear wheel lock-up and skidding, coming to a safe stop; started up after cool-down. Incident got my attention! Don't reckon I developed two-stroke twitch, but . . . my fingers stayed close to the clutch lever, ever after.)
Last edited by LoneRider; 05-11-2012 at 01:46 AM.