I recently came back from college and went to fire up my SAM-400, started right up but seemed to be running at a much higher rpm than usual, plus it would not come back down from the high idle speed. So we tweaked and tweaked until we took the carb off, and the butterfly valve was stuck open. so we fixed that. Now it will start and run on high idle for a bit then return back to low(lower) idle like it should, its just that the low idle isnt as low of an rpm as it used to run during the summer. And when I go to strike an arc it will idle up correctly but it will not spin fast as it used to.  It's like its stuck in the middle of the rpm range no matter what.

I will also mention that the idler is working correctly, and I've tried to change the position of the pin on the arm on the idler, but no changes occur. I have also adjusted the screw on the goverenor which changes the idle speed. But that only makes both the high idle and low idle lower by the same amount. Does anyone have experience with the adjustment of these machines. Ive looked through my operators manual but they do not provide detailed instructions on such adjustments only detialed drawings of the assemblies. I have a feeling it has to do with the governor being out of whack, even though it seems unlikely that it is out of adjustment because it is purely mechanical, but I suppose there is still a chance.

Any help would be great.. Thanks

Mike