SMALL - SMALL - Telemetry SMALL - Radio
Thread Tools
Old Feb 27, 2010, 01:16 AM
AMA 910957
EJWash1's Avatar
United States, WA, Hoodsport
Joined Mar 2008
5,516 Posts
OS FS-91 Surpass -vs- FS-91 Surpass II

Hi All,

Any significant differences between the OS FS-91 Surpass and FS-91 Surpass II?


EJWash1 is offline Find More Posts by EJWash1
Reply With Quote
Sign up now
to remove ads between posts
Old Feb 27, 2010, 07:41 AM
Dieselized User
gkamysz's Avatar
Joined Feb 2000
7,480 Posts

gkamysz is offline Find More Posts by gkamysz
Reply With Quote
Old Feb 27, 2010, 08:41 PM
Registered User Wannabe
rodneygt's Avatar
Southwest Mississippi, USA
Joined Jan 2008
1,529 Posts
In a nutshell:

Both hsn and lsn are on the same side of the carb with the surpass II.
Black valve cover on the surpass II.
Surpass II recirculates the extra oil back into the engine (I think the surpass I just expels it like a saito.
There's no choke on the surpass II.

I have a surpass II 91. I've a friend with a magnum 91 (clone of the surpass I). The two engines are very much equivalent - same weight, power and sound - just the minor differences already mentioned. There's some more technical valve timing changes mentioned in the linked thread but that doesn't seem to make an appreciable difference in power.
rodneygt is offline Find More Posts by rodneygt
Reply With Quote

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold FS-91 Surpass II 4 stroke "one day only"SALE lla Aircraft - Fuel - Engines and Accessories (FS/W) 2 Feb 03, 2010 11:30 PM
Sold New os 91 fs-ii surpass 4/stroke RICH REYBOK Aircraft - Fuel - Engines and Accessories (FS/W) 0 Jan 28, 2010 07:25 PM
Sold OS 91 FS SURPASS I (NEW and never ran)$190 SHIPPED! flyinjrc74 Aircraft - Fuel - Engines and Accessories (FS/W) 0 Jan 19, 2010 05:30 PM
Discussion Interesting: Old OS Surpass 91 / FS-91S Supass II Jasonb3391 Engines 8 Dec 02, 2009 09:11 PM
Discussion dis-assembly OS MAX 91 FS Surpass II danny-bee Engines 4 Oct 11, 2009 09:42 PM