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Info on FS120S II

Old 11-01-2003, 04:31 PM
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Default Info on FS120S II

I just got a hold of a used FS120SII. I heard something about the pumps on these engines put out excessive fuel pressure to the carb. Is this correct? Is there a simple fix for this?
Also, are there any other known problems with this engine that I sould be aware of?
What is your take on these engines?

Thanks for your EXPERTISE!

Oh Yeah.

This is my first 4 stroke, and I read a post about 4 stroke fuel, and I am kind of confused. I heard that I should run at least an 18% oil content. In the post, some where saying 20%, and as low as 16%, (you can see why I'm confused). I run Wildcat 15% nitro, w/16% oil content in my 2 strokes, would that be ok to run in the 120, and if not, could you give me some giudlines to follow when selecting fuel for this 4 stroke?

Also, I am at 7000ft Elev. if that makes a difference.

Thanks again!
Old 11-03-2003, 10:27 AM
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Default RE: Info on FS120S II

For setting your engine, please see the O.S. web site FAQ:

An fuel with at least a 16% oil content will be OK. A fuel with a higher oil content won't hurt the engine one bit.

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