JJ71

Hi, dose anyone have an exploded view of the early OS 40 fourstroke? I'm looking for a part number for the carb needle valve.

706jim

I have the instructions for the FS40 Marine. The needle valve will be the same. Or look up the 40 Surpass should also be the same. Info not handy at the moment though.

JJ71

Sorry I'm new to this lol. Do you a picture of the parts diagram? The surpass needle is different. I can find that parts diagram easily on the net but the old fs40 I just can't.

1200SportsterRider

OS FS-40

Would this be it? Thanks

JJ71

Yer that's the engine. Just need the exploded parts diagram with the numbers on.

Jesse Open

Sorry, no pictures, only names and numbers.

The needle valve is O.S. part number 45281970
Does that tell you whst you need to know?

JJ71

Excellent mate that's perfect.

Jesse Open

Great!

Enjoy

Maxam

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The OS FS-40 is one of the best engines ever made. The carb has instantaneous throttle response, the vibration levels are low and a 10x6 is the ideal prop.

jaka54

Hi!
Ran one of those OS FS .40 engines 25-30 years ago (still have one new in box) . Fuel was 5% nitro and 20% castor oil and rest methanol.
Ran best with a 11x6 prop! This is at sea level. Plane was a low wing plane, a Carl Goldberg Skylark 56.