The parts that are causes for air leaks from the exhaust are listed below from most common to least common: 1) o-ring on the inside diameter of the head valve piston 2) o-ring on the outside diameter of the head valve piston 3) cylinder seal 4) head valve piston 5) cylinder cap 6) cylinder sleeve -- check the area where the cylinder seal seats on the cylinder sleeve Note: the o-rings and seals are included in all o-ring/rebuild kits, or the individual parts can be ordered separately. See Service Parts posting on this site.
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