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As the replacement for the high-performance 46FX, it's no wonder that the .46 AX shares many of its features. The raw power. A remote needle valve. Mounting bolt patterns. A balanced "D"-cut crankshaft supported by dual bearings. CNC-machining for the piston and other parts. And the same exclusive ABL cylinder liner that has made FX reliability a byword. But all the same, the 46AX is a different - and better - engine. Why? Because times change and technology advances. And because O.S. uses the best of both to make a good engine a better engine.
Features the 46FX's durable ABL (Advanced Bimetallic Liner) plating, as well as a new design that automatically centres, levels and seats the head during re-replacement. Head snugs down with only four screws - not six.
Subtly tapered low-end needle eliminates surging at transition, ensuring exceptionally smooth, consistent throttle control from idle to top speed.
Redesigned liner ports and a ball-milled inlet port minimize turbulence during fuel/air mixing, making combustion and power output more predictable.
New high-speed needle bracket simplifies horizontal/vertical mounting - and can be replaced in just minutes.
Minimizes vibration-induced "creep" and re-sets with a ratchet spring on the high-speed needle and O-ring seals on both needles.
A simple rotor guide screw replaces the throttle stop screw - and eliminates spring-related movement.
Includes a new low-noise E-3010 muffler
Includes a lock nut and longer crankshaft with more thread length, for better prop nut engagement and greater pilot safety.
ABL (Advanced Bimetallic Liner) uses two O.S.-developed alloys to provide durable barrier between the brass liner and piston
Switching the needle from a horizontal to a vertical orientation requires only a couple of minutes.
A composite needle housing insulates the brass sleeve and prevents heat-related changes to needle settings.
A generously sized chamber and larger sound baffle significantly reduce exhaust noise. Rotating the exhaust port provides easy finish protection.
Displacement: 7.5 cc (0.455 cu in)
Bore: 22.0 mm (0.866 in)
Stroke: 19.6 mm (0.772 in)
Practical rpm: 2,000-17,000
Output: 1.65 hp @ 16,000 rpm
Weight w/muffler: 17.2 oz (489 g)
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