One of our Chilean hobby stores is having a good deal on OS engines. I want to get a new 91 4-stroke for a 60" pattern plane.
I have had experience with a 26Surpass and a Saito.72, and this time I'll go with OS because it is on sale much cheaper than the Saito91. (I know the Saito is lighter!)

Questions:

I see the 91Surpass is offered in a pumped and non-pumped versions. Now, IS the pump really-really worth the BIG price difference? (almost 1.5 times!!!) Are there any other differences besides the pump&carb???

Anyone with experience on both engines?

Thanks a lot for your help!!!