High Engine Speed - Air Vane Governor Question - Page 2 - Snowblower Forum : Snow Blower Forums
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post #11 of 11 Old 09-06-2019, 03:50 AM
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Most of those little two stroke engines were not designed to idle, they usually had a fixed throttle set to high idle working speed. The carbs were not designed to idle too well either, they were designed for maximum governed engine speed. They would not carburate well at idle speed, meaning they wont mix fuel with air properly.
I did see a problem already with the little screw that attaches the butterfly valve/throttle plate to the throttle shaft falling out and getting sucked into the engine while it was running. When that happens you won't be able to get the engine to slow down enough to an idle speed, even when you take your hand and physically turn the throttle shaft down to an idle, the engine will keep racing because of the air leak through the hole where the throttle plate screw was. Another thing that can happen is when the throttle plate moves out of position in the shaft and becomes jammed causing the throttle to stick in the open position.
Also make sure your carb is tight to the mounting surface and the gasket is not leaking, and a worn throttle shaft or bushing can also cause an air leak and a high idle speed. That is common on those older two stroke engines.
Another thing that can cause two strokes to not idle well is worn crankshaft seals and crankcase vacuum leaks, either from any seals or gaskets, to porosity in the aluminum cases, which was very common in those little motors when they got older.
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