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Ignition Module was pulled off spark plug, instead of twisted by home owner. No fire and did not make good connection. Piston ring froze to piston, no compression. Replaced carburetor.
Used Metric tool set with Hex and Allen sockets with socket screw driver to remove cover. Screws are set in about 2 inches deep. Had to use vise grip pliers to hold impeller bolt while using a wrench to loosen nut holding the impeller on. Then the engine comes out after you disconnect the ignition wires. Removed carburetor and ignition module. To remove one of the bolts holding the head on the engine I had to cut off 1/4 in off the ring on a allen wrench that comes in a fold up set to have the length to reach the bolt.Used vise grip pliers on allen wrench to loosen and tighten these head bolts. Used a small jewelers screw driver to remove the 545154009 piston ring and to clean out carbon build up. Slid new ring on piston. Squeezed ring on piston with fingers and pushed into head. Re-installed head with new gasket. Poured a little 2 stroke oil on bottom of piston rod to help break in the new ring. Installed new carburetor. When installing ignition module the original screws stripped. Had to buy 1/4 longer screws to catch the threads. Used business card for air gap on ignition module. Connected ignition wires, placed engine back in cover, screwed on impeller, placed top half of cover back on, screwed together. Put gas in...started 2nd pull.