Helo

I have os 46 AX in my pitts and the power isnt very good. I have made 5 flights with it and thats it.
I was wondering if up greading to os 55AX will make big difference. It would be simple becouse the 55 has identical dimensions as 46.

Or should i go with .61 size 2 stroke?

YS.63 or Sato .72/82 will give you ripping torgue. A .55AX will provide a noticible increase in UUUMPH.

yeah baby how is that bird treating u all?

I was thinking about 2 stroke engine becouse its hard to get good 4 stroke engine in Poland.
YS 63 costs about 350$(Polish dealer price) so i would have to be insane to buy it
the same situation with Saito

only 4 strokes in normal prices are O.S and Magnum

an OS FL 70 4 stroke is pretty cheap ... and it will fit in the same size hole as a .46. The bolt holes will be a little farther apart though. The .55 will give you a little more power, but it may still lose altitude in a hard turn.

what prop are you using?...before switchibg out engines i would recommend a 12x4 APC and a 12.25x3.75 APC first if you havent done so already.