OS 120 FS help

I have the old style O S 120 FS that was new in box. I installed it in a
Funtana 90, broke it in per instructions engine has no power. Starts great
but only turns about 6500 RPM's on the grd. set on the rich side w/ tach.
Prop 16-4 wide
Fuel 15 % with 20 % syn. oil
Plug OS F
Valves Adjusted after break in
Fuel tank No leaks and center of tank at carb level
Fuel line Med
Thanks for any help
David Edwards
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Pat Edwards
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Have you tried different props? a 15 x 4 or 15 x 3.75 or so might help. Good luck. Let us all know what works. Andy
We can make a box of wood.....FLY!!
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