MAX-91HZ (improved version of MAX-91SZ-H RING) has been improved greatly corresponding to users requests in the field of F3C.

The slim heatsink head fits into fan shroud without having to cut it. So the fresh air reaches the heatsink head and the carburetor without any loss. The improved areas are the scavenging port, exhaust port, crankcase heatsink, and the new heatsink head. The combination of these modifications contributes to cool performance and stable power output.

Engine noise is reduced by improving the overall balance of the engine for smoother higher engine performance. MAX-91HZ has succeeded in acquiring champion quality to win FAI F3C keeping it "easy to tune" and "consistent R.P.M." nature achieved by the fine tunings through O.S. Engine unrelenting effort.

SPECIFICATIONS:
Displacement: 14.95cc(0.912cu.in)
Bore: 27.7mm(1.091in)
Stroke: 24.8mm(0.976in)
Weight: 618g(21.8oz)
Output: 3.4ps/15,000r.pm.
Practical RPM: 2,000-16,000r.p.m.