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Adjust carburetor won't start, or if it does won't idle.

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Before adjusting anything, check the condition of factors that pertain to the proper running as: fresh fuel mix, plugged fuel filter, air cleaner, and muffler. Poor fuel lines, and loose carburetor fasteners. Remove the spark plug, and place it on engine metal (wire attached). Pull the engine through smartly--the spark should be blue and snappy. Plug gap should be ~0.020" and the insulator should be light to medium tan in color. Try a new plug if in doubt. When these things appear to be correct, turn both jet screws CW to stops (lightly), and then CCW each back out 1-1/2 turns. It should start and run fairly well at this point. Allow the engine to warm up, pull the throttle full on. The engine should be 4-stroking--turn H needle CW until the engine starts to speed up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Allow to idle and adjust L CW until the engine runs fairly smoothly, yet allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain doesn't turn, but the engine doesn't stall out. If you can't get the above to work, you may need to clean and re-kit the carburetor first. Hope this helps!

Posted on Apr 29, 2010

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