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Engine Construction - O.S. Engine FL-70 Owner's Instruction Manual

Four cycle engine fl-70.
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ENGINE CONSTRUCTION

With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal.
The cylinder bore Is a little
tapered.
The piston and cylinder are
designed to achieve a perfect
running clearance when they
reach their running temperatures.
Cylinder Liner
Crankshaft
A little tapered
When the engine is cold. When the engine is hot
Piston

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  • kim wareham Feb 18, 2019 01:52:
    I make an auful mistake by getting an OS FL 70 engine it is without doubt the most dangerous engine I have in my collection by a long way if you prime it and try to start it will take your fingers off it might run backwards and through the prop off and you have to reprime the pig I have several four strokes and none of others do this I am going to get rid of the pig and I wont have O S againrrr