O.S. Engine OSMG0981 81FS-a 4-Stroke Upgrade for 60-Size Airframes  [OSMG0981]

O.S. Engine 81FS-a 4-Stroke Engine
Price:
CAD$524.61
Brand:
O.S. Engine
Model:
OSMG0981
Please kindly input your name and email address, we will inform you once we have the restocking.
Or you may find similar product under the
category
Write a review

Boost Thrust in Your 60-Size Airframe with the O.S. Engine 81FS-a

The O.S. Engine 81FS-a, model number OSMG0981, is a strong option for modders and sport pilots upgrading 60-size aircraft. It installs into the same footprint as the FS-70SII without firewall modifications, delivering a clear step up in usable power.

Advanced lubrication and carburetion

One notable element of the 81FS-a is its sealed lubrication approach that removes the need for crankcase ventilation, helping to reduce routine upkeep. The included 60RA carburetor with venturi improves air and fuel metering while limiting the chance of fuel entering the cowl. A rubber O-ring on the muffler manifold also helps prevent oil seepage for a neater installation.

Performance and fitment details

Specifications

  • Displacement: 0.809 cu in (13.26 cc)
  • Bore: 1.091 in (27.7 mm)
  • Stroke: 0.866 in (22.0 mm)
  • Weight w/muffler: 20.11 oz (570 g)
  • Practical rpm range: 2,200-10,000
  • Output: 1.3 hp @ 11,000 rpm
  • Includes: 60RA carburetor, F-5030 muffler

The O.S. Engine 81FS-a balances durability and power, making it well suited for hobbyists who want dependable 4-stroke performance in 60-size models.

Will I need to change the firewall to fit the 81FS-a?

No, the O.S. Engine 81FS-a mounts into the same space as the FS-70SII and does not require firewall modification for proper fitment.

What propeller range should I test first?

Start with prop sizes commonly used on 60-size 4-strokes and fine tune pitch and diameter on the ground to match the practical rpm range before flying.

How does the lubrication system reduce maintenance?

The sealed lubrication layout eliminates the need for crankcase ventilation, which helps keep internal oiling consistent and cuts down on oil carry into the cowl.

Are there measures to prevent oil or fuel leaks?

Yes, the 60RA carburetor with venturi and the muffler manifold O-ring together reduce the risk of fuel or oil reaching the cowl, keeping the installation cleaner.

Copyright © 2008-2026 rcjaz.ca All rights reserved