View Full Version : ys .91 sr
Jeff Palmer
05-02-2007, 06:57 PM
Has anybody been testing this motor???
what mufflers????
what gear ratios???
performance????
DavidH
05-03-2007, 09:36 AM
Yes there has been a few pilots using the 91SR for nearly a year now. Wayne Mann, Dwight Shilling and Todd Bennett have been using it.
It is long stroke engine as the ST version is a short stroke engine.
Wayne and Dwight are using Hatori mufflers last time I looked. Todd is probably using the same.
David
sookainian
05-14-2007, 01:57 AM
Power compare to OS, which is better ?
G MAN
05-14-2007, 06:37 AM
Since it has a larger carb and bigger ports,it should have more power than the 91ST.What they need is a good muffler for it,my guess is you would choke it with an SB16 . I have an SB 18 i'm putting on mine, it might not be the ultimate muffler but it's the only thing available except for the SB16 and muscle pipe.DOUG