QuestionEngine started fine, ran well, but at end of mowing job, engine would not cut back to idle. All linkages seemed OK, governor spring OK also. Nothing sticky. Stopped engine by disconnecting plug. On several restarts, engine went to high speed, no throttle control at all. Was concerned about runaway, so always disconnected plug promptly. Tried adjusting low and high speed jets, had no effect. Did not examine throttle plate. Choke plate operating normally.
I'd bet this isn't a common problem. Is there an easy way to test the governor by moving the arm manually? As I say the spring seems fine. Could there be a huge air leak somewhere? Never seen anything like this before!
Please advise on where to begin. I do not have the engine here now but would like to begin diagnosis as soon as I return to my camp.
Thanks very much for help!
Frank
AnswerIf it isn't running away, then it sounds like it is in the carb,
like the throttle sticking, which can be confirmed bysimply moving the gov arm and watching the top of the carb.
If the throttle control is no longer shutting of the engine, while it did before, then the problem might be with that, unclamp
it and work it while watching it.
If the throttle seems to be sticking, the throttle plate screw may have fallen out and the plate is lodged in there, or it may just be gummed up. Take a look and let me know, and find the engine's
model and spec numbers.
