With the throttle at minimum i.e. the stop position (when the coil shorts out on the carby base) the throttle is in the fully open position-just like the picture above. Doesn't sound right does it? Moving the throttle cable makes no difference to the butterfly but changes tension on the springs, I guess so the governor vane can take over.

And yes, If I start the engine and manually move the vane it will control the engine speed. Grumpy, thanks for your help. I am going to sleep on it and have a go tomorrow. If you think of anything let me know.

Last edited by sparker; 20/07/11 11:39 AM.