For sake of arguement, which do you think is a better motor..... OS .61sf or FX61?

Both new in box? At the same price? I'll take the SF every time. Its a workhorse that will last a LONG time. If you don't abuse it, you'll probably never wear an SF out.

If you want top speed... the FX can handle a higher top rpm. But that gets the engine hotter, and wears it out faster.

I agree w/ FHHuber and if everything (price, age of motor, etc) was equal the OS .61SF would be my choice. In reality everything is not equal though and for sport flying I’d go w/ the FX due to its lower price.

There’s no doubt that the SF is the better motor but in my opinion the difference is not really significant for most Sunday flyers.

Any "SF" is a winner.

Seems like the OS 2C's keep getting more expensive, heavier, and less powerful than their predecessors.

The old FSR's were wildly powerful engines....the SF's were a step down in the opinion of some, and now the FX is a de-balled version of something engineered for the masses. Idiot proofed if you will.

Well...when you idiot proof something....they build better idiots to compensate!

Go with the SF....it's a fine motor.

'Nite