Quote:

We had the base plates resurface at the machine shop and now the idle is better at 1100 but every now and then it climbs up a little and goes back down the timing is locked at 38 degrees


sounds like a lean idle condition. also make sure the throttle shafts in the end carbs are working freely. i've had them bind up a little after the carb was tightened down. why a locked in advance?