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I have a 452 echo. lost the manual in a move. the boys 8-9 decided to tune up the saw and now I can't get it running...can you help me with the begining setings..Thanks John

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Likely, they have adjusted the H and L jet needles and maybe the idle speed screw. Turn both jet screws CW to stops (lightly), then back out each CCW 1-1/2 turns. This is a basic setting and should let the engine start and run. Start the engine and let warm up, then pull the throttle full on. Adjust H jet needle CW until the engine starts to speed up, but 4-stroking. Proper adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW for better idle, but allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but allows the engine to continue to run. Hope this helps!

Posted on Sep 09, 2010


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