Tune Up Kit for McCulloch Pro Mac 10-10 555 700 Chainsaw 55

Tune up kit for McCulloch Pro Mac 10-10, 10-10S, 55, 555, 700 and 7-10 chainsaws, containing three pieces: the air filter, the fuel filter and the spark plug. The air filter replaces McCulloch part numbers 216685, 69922 and 92420, which are successive numbers for the same later style filter. Early Mac 10-10 saws used a different filter, catalogued as 91456, 86397 or 89458 and often made in flocked or felt material, and this kit will not fit those. Compare the old filter before ordering. The original AC spark plug specified for these saws is long out of production, so the kit supplies the modern equivalent, gapped at .025 inch. Fuel mix is 40 to 1 with modern two stroke oil. Check the fuel line where it passes through the tank grommet at the same time, since cracked line of this age leans the mixture and produces symptoms that look like a carburetor fault.

• FITS McCULLOCH PRO MAC 10-10, 10-10S, 55, 555, 700 AND 7-10 chainsaws. The air filter in this kit replaces McCulloch 216685, 69922 and 92420, which are three numbers for the same filter across its production run. A saw that bogs under load, loads up at idle or will not hold a tune usually needs all three of these before it needs a carburetor.
• LATER STYLE AIR FILTER. The early Mac 10-10 used a different filter, McCulloch 91456, 86397 or 89458, often in flocked or felt material rather than the later design. If your saw is an early one, this filter will not seat correctly. Pull the cover and compare before ordering.
• SPARK PLUG GAP IS .025 INCH. The original AC plug specified for these saws has been out of production for decades, so the kit ships the modern equivalent. Gap it at .025 and torque it by feel, snug plus a quarter turn on a warm engine, rather than leaning on it.
• THREE PIECES, AND DO ALL THREE AT ONCE. Air filter, fuel filter and spark plug. A tune up on a saw this age is only worth doing whole: a new plug behind a clogged filter fouls again within a tank, and old fuel line feeding a clean carburetor still draws air. Fuel mix on these is 40 to 1 with modern two stroke oil.
• WHILE THE COVER IS OFF. Check the fuel line where it enters the tank, since line of this age cracks at the grommet and leans the mixture in a way that looks exactly like a carburetor fault. Look at the impulse line too, and clean the packed sawdust out of the flywheel fins and the cylinder cooling fins while you have access.