Do-it-yourselfers can benefit from having a leak down tester like this unit now available from Florida-based Pit Posse Motorsports. Designed to check cylinder leakage in 4-stroke engines, the Pit Posse Motorsports Leak Down Tester is simple to use. Simply remove the spark plug(s), position the piston at top dead center, hook up the supplied line, connect it to the pressure gauge and connect a minimum 70psi air source to help locate a source of trouble such as a burned valve, leaking head gasket or worn piston rings. $89.95.
