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Product Details
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O.S. FS91 Surpass II w/F-4020 Sil.
Developed from the popular FS 91 Surpass and honed to perfection in this latest model.
Like its 52, 70 and 120 stablemates, the new FS 91 Surpass II features a new carburettor, longer crankshaft, plated camshaft/crankshaft/ ring and assure it's owner of the best performance in it's class coupled to the O.S. legendary quality and long life.
This is a great engine for scale models that specify a 61 size two stroke as that four-stroke sound is particularly suited to this environment.
Specification
Propeller Range: 11x11-12 12x10-12 13x9 14x7 15x6 16x6
Weight: 640g
Displacement: 14.95cc 0.912cu. In.
Bore: 27.7mm 1.091in.
Stroke: 24.8mm 0.976in
Power Output: 1.6/11000 (BHP/RPM)
Practical RPM: 2000-12000
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