Hi xcarlos!
Thank's for your awsome pic!
I like so much OS engines when they are packed!!!
So,i must admit that removing this part will result in a bit loss of power,but this loss is not too much to consider it.
So,xcarlos your engine without this part is working good?
Also can you tell me with an APC 14x6 prop. what rpm idle you have?
zain Date 2/6/2006 5:03:58 PM
A pitts style muffler from bisson or slimline will solve your problem.
this engine requires a good back pressure so i wouldnt mess with the stock muffler.
zain
-->Zain: I must tell you that no other muffler will be better than the one that OS supplies with the engine!
I think all people are with me...
So,yes i know that OS 91 FX needs enough back pressure (which the original muffler provides),but....
Many paople in RCU complain for problems with backpressure and not good fuel feeding
]
BUT....
OS 91 FX NOW comes with new needle valve and cover plate.
And these new things work and minimize ANY problems to minimum.