OS 91 FS 4 stroke instruction manual - RC Groups
Shop our Airplanes Products Drone Products Sales
Thread Tools
Apr 04, 2006, 09:04 AM
In love with my Rappy
Help!

OS 91 FS 4 stroke instruction manual


I'm currently looking for a manual for the OS 91 FS four stroke engine that tells all about tuning, parts list, what bits do what.
I bought a model with this engine in it and had a bugger of a job getting it to run. finally sorted out the problem (had the wrong plug and was detonating at higher revs) but I would like to read a little on the motor and suggested tuning methods.
If any one has a copy to spare or can scan it and put it up here or email it, I would be very appreciative.
I never owned a four stroke before. Having just taken the hobby up again after a looooong break, I am suprised at how far the technoligy has come in both gas/glow and electric engines. Its waaay cheaper to fly now with the good gear than it was when I was a kid.
I was king of the block with a frog 15 diesel and a sanwa four chnl back then.
Cheers, Wiz
Sign up now
to remove ads between posts
Apr 04, 2006, 10:28 AM
In love with my Rappy
Thanks Kim Yong. you are a gentleman and a scholar.
that is as close to perfect as one can wish for.
Last edited by wiz310; Apr 04, 2006 at 10:34 AM.
Nov 17, 2014, 01:29 AM
Registered User
Hey guys, Im also looking for specs or a manual for a very old OS 91 four stroke, This is a non Surpass engine.
Nov 17, 2014, 03:51 PM
Engine man
dmrcflyr2's Avatar
Is this the one you are looking for?
Nov 17, 2014, 06:02 PM
Registered User
You bet dmrcflyr2! Thank you so much.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
os 61 fs 4 stroke questions DeaninMilwaukee Engines 5 May 31, 2009 05:14 PM
Help! OS 52 FS 4 Stroke londonboy Engines 2 Nov 26, 2006 01:47 PM
Sold OS 91 Surpass 4 Stroke Engine Vanguard Aircraft - Fuel - Engines and Accessories (FS/W) 0 Jul 23, 2006 06:31 PM
Sold os 52 fs 4 stroke philfun Aircraft - Fuel - Airplanes (FS/W) 4 Sep 27, 2005 04:25 AM
OS .91 surpass 4 stroke with mount, fuel filter, tank, prop, spinner Steve H. Aircraft - Fuel - Airplanes (FS/W) 2 Jul 01, 2004 10:01 PM