O.S. FSa-81 w/F-5030 Silencer

O.S. FSa-81 w/F-5030 Silencer

Brand: OS Engines

Part Number: L-OS34810

£295.79 Web Price RRP £339.99

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The new FSa-81 is a direct replacement for the FS-70 Surpass II, offering greater power and throttle precision in a compact and lightweight design. The crankcase mounting dimensions allow the FSa-81 to slot into the same mount that an FS -70S II would for an instant power upgrade.

Like the FSa-56, the crankcase breather system has now been incorporated inside the engine to negate the need for an external vent and the excess oil that eminates from it. A propeller locknut assembly is of course standard.

The new F-5030 silencer is very effective, thanks to it's internal baffle and carefully matched internal volumes and opassages. The design allows a huge range of outlet positions to accomodate almost every model. Even the distance away from the engine can now be adjusted.

The latest 60RA carburettor now features a 'constant velocity' inlet for improved throttle response and reduced spitting.

Propeller Range: 13x7-9, 14x6-7
Silencer: F-5030
Weight: 556g 19.63oz
Displacement: 13.26cc 0.809 cu.in.
Bore: 27.7mm 1.091in.
Stroke: 22.0mm 0.866in.
Power Output: 1.3PS @ 11,000
Practical RPM: 2,200 – 12,000

  • Brand: OS Engines
  • Part No: L-OS34810
  • Format: Nitro 4 Stroke

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