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 YS Engines - YS 91 FZ  The YS 91 FZ is the most powerful 91 four-cycle engine available - more power than most 1.20 size engines. This engine offers many of the exclusive features proven on other YS engines. The supercharged system with air chamber uses crankcase pressure coupled with a double throttle valve which allows a larger fuel/air mixture to enter the combustion chamber for greater power. A special low volume piston design creates more crankcase pressure for consistent fuel flow to the regulator. Fuel regulator and pressure system is unaffected by tank position or aircraft attitude.
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Updated December 28, 2002