It sports an internal gear reduction to a countershaft equipped with a harmonic damper that Yamaha spent two full years developing before bringing the engine to market. The YG4 engine runs at just 2/3 its rated RPM at WOT, power band determined by the cam grind and timing and reduced to accomodate the stock sled clutching. The installed engine with electricals, oil tank, radiator, all the plumbing, starter, and intake silencer plus complete exhaust less muffler weighs just 165 lbs dry - the same as a 100 HP 912 Rotax, and at least 20 lbs lighter than a 110HP 914 which can only be run at WOT for a few minutes.
That YG4 engine is 998cc, liquid-cooled, with both electric and liquid carb heat. In 2012 MAC built and flew the first successful (4-cycle) YG 4-cylinder, a 145HP engine taken out of a 2003 RX1 with 2,000 miles on the sled, and installed on an Air Command gyroplane. By now there are more than 200 Yamahas flying here and abroad. Mohawk Aero Corps (MAC) has been building Yamaha Genesis (YG) 4-stroke (snowmobile engine) conversions longer than anyone in the business. Mohawk Aero Corps has completed and successfully test flown (after extensive ground running of the power plant) 2 hours off of their newest Yamaha conversion engine offering: the 2011 - 2018 model years for the 160HP Apex EXUP snowmobile engine, with titanium headers incorporating an ECU-controlled valve for variable exhaust pressure tuning throughout the power band, resulting in more mid-range as well as top-end power.
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