Oh yeah.... but who is running two strokes any more? When was the last time you saw a two stroke bike? I haven't seen one on the streets in years.. I don't think they will ever meet current smog requirements.Originally posted by SS930
Works great, but the system has a couple of flaws. Yamaha engineers have had a hard time keeping the powervalve retaining pins locked in, when they fail they fall down into the cylinder taking the engine with it. Also, the powervalves build up carbon and if they aren't cleaned at least every so often they can jam up and again pop the engine. Even though they have problems, the system still makes impressive power.