OS 91FX

[ronlock at comcast.net]

Ive dealt with a couple of OS 91s that ran well,
except for intermitent flame outs for no apparent
reason.   A head gasket fixed them.

Ron Lockhart
> 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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