O.S. Engines Support Ask Bill Baxter your questions about O.S. Engines.

OS 120 Surpass II

Old 10-11-2002, 02:36 PM
Junior Member
Thread Starter
My Feedback: (25)
Join Date: Aug 2002
Location: MS
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default OS 120 Surpass II

I purchased this engine used and it came without instructions. The pump had been by-passed upon receipt, and no matter what I try, I cannot get the engine to run properly. I attempted to D/L your Surpass III instruction manual, but the pages that show the pump hook-up are messed up (according to Adobe).

Any help that you can provide will be GREATLY appreciated.
Old 10-14-2002, 03:34 PM
My Feedback: (11)
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,483
Likes: 0
Received 6 Likes on 5 Posts
Default OS 120 Surpass II


The O.S. Max FS-120 Surpass II w/pump has three nipples on the pump unit. "In" takes fuel from the fuel pickup in the tank. "Out" goes to the carburetor fuel inlet. "R" is the return line to the fuel tank. Your fuel tank will also need a vent line. The vent line should run from inside top forward and exit through the bottom of the fuselage. The "R" line should dump to the forward bottom of hte tank.

Basic setting instructions can be located at:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.