OS 91FX

[francisco gonzalez]

Ihncheol Park
what kind of pipe do you use in the 91 sx ??? i hev one
91fx and i will install in my new Quest 90 .
thanks
francisco





On Fri, 24 Oct 2003 21:13:53 -0700, "Ihncheol Park"
wrote:

> 
> Dave,
> 
> I ran 91SX-H with muffler, & tuned pipe.
> The engine is nearly identical to 91FX except the
> porting & needle valve
> which added 0.1 hp.  Bought it cheap from a heli guy. 
> 91FX & 91SX-H were
> both troublesome to many people.  Both use same piston
> & very slightly
> different cylinder.
> 
> Only have rpm with tuned pipe. Added 1 extra headshim
> (gasket), Magnum #1,
> APC 15x8 @ alittle above 10K, Not 100% tuned. Perry
> Vp-30.  I bought it to
> use instead of YS 91. 91FX should do very similar.
> 
> Without a tuned pipe, 91FX will not overrun the YS
> 91AC/FZ.
> 
> Ihncheol Park
> 
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of
David
> Gundling
> Sent: Friday, October 24, 2003 9:44 AM
> To: NSRCA discussion list
> Subject: OS 91FX
> 
> 
> What is the story on the 91FX. I have seen guys
> reporting
>  that they are running up to 15 inch props. Reports of
> running
>  a 14-10 are common. Is this with the muffler or is it
> obyained only with a
> tuned pipe? The factory
> recommended prop is something like a 13-8.On RC
> Universe there has
>  been a love/hate situation with the engine. Some
> report no troubles.
> Others can't get it to run well
> despite numerous efforts and parts changes. Is this
> thing as strong as a
> YS91?
> 
> Thanks.
> 
> Dave
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