Hi Dar,

How much more is the power of this OS.90FSR versus the power of the current .91FX ?
As well, if you compare with the current line of OS Heli Engines, which have 3.0 to even
the 3.3 bhp, is it all in the intake "magic" or it has to do a lot with the Exhaust too ?

Or the same questions in another way, is it possible to improve the current .91FX
by drilling/polishing the intake to make it as close as possible to the Heli engines,
of course if you have had time to look at and compare them ?

And one more Question (maybe we can copy this into the MVVS page; please
advice how to do that, or just move this to that page if you can): - On the 15cc
MVVS it is stated possible to rotate the sleeve so the Exhaust could take side or
rear position. OK, that is really great and one more reasons for me to "migrate"
from OS to MVVS. Could we compare the Power of the MVVS versus
those .91 (FSR, FX, SZ, etc OS-types) in the different position of the
MVVS's exhaust, i.e. as you guessed I am expecting MVVS to have different
output power at high-end in all of the four(4) different positions of the exhaust,
is that the practically possible and what is the outcome ?

Regards,
Nick