OS 120 FS help

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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