A really important test of two stroke engines is the crankcase vacuum and pressure test, as air leaks through crankshaft seals, intake boot, cylinder gasket, decompression valve, impulse tubes etc can cause them to run lean leading to premature failure of the engine.
To perform a vacuum and pressure test of the Husqvarna 372 XP X-TORQ chainsaw engine, the intake needs to be blocked off, and the exhaust blocked off, and the test can be performed using the impulse hose.
The intake boot in the Husqvarna 372 XP X-TORQ has a rubber tongue that projects into slots in the carburettor throat, part of the strato engine.
Above, Husqvarna 578-09-56-01 intake block off adapter for the Husqvarna 372 XP X-TORQ. The open end of the ‘tube’ mates with the rubber intake boot, and the recess accommodates the tongue mentioned. Continue reading An improvised intake block off adapter for the Husqvarna 372 XP X-TORQ etc