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

FS-91S No Pump, Needle Valve Setting

Old 09-06-2010, 07:08 PM
  #1  
Junior Member
Thread Starter
My Feedback: (5)
 
arobatto's Avatar
 
Join Date: Jan 2004
Location: Ewing, NJ
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default FS-91S No Pump, Needle Valve Setting

Greetings Mr. Baxter,

I have a 2000 FS-91S without a pump that needs to have the needle valve fully closed to run lean enough. In searching this forum I learned that it may be a worn needle valve seat, a worn needle valve or a combination of the two. May I ask what part/s would be needed to correct this problem? Also, may I trouble you for part numbers if available?

Best Regards,

Alex Robatto
Old 09-07-2010, 09:09 AM
  #2  
Bax
My Feedback: (11)
 
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,483
Likes: 0
Received 6 Likes on 5 Posts
Default RE: FS-91S No Pump, Needle Valve Setting

You'll likely need a new needle valve and carburetor body. The symptom indicates a worn needle seat in the carb body. The needle will have a polished ring on the pointy part, which indicates wear.
Old 09-07-2010, 09:25 AM
  #3  
Junior Member
Thread Starter
My Feedback: (5)
 
arobatto's Avatar
 
Join Date: Jan 2004
Location: Ewing, NJ
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default RE: FS-91S No Pump, Needle Valve Setting

Thanks for your quick reply sir. Since I don't have the original manual, may I ask if if the following are the correct catalog numbers?

Needle: OSMG7062
Carb. Body: OSMG3578



Thanks again,

Alex Robatto
Old 09-10-2010, 12:18 PM
  #4  
Junior Member
 
Join Date: Sep 2010
Location: , BC, CANADA
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default RE: FS-91S No Pump, Needle Valve Setting

     Greetings,  I have an O.S.91-fs(nopump) Quest.? can someone tell me(approx.) How many turns out(counter-clockwise) after seating the needle, is recomended for starting ? thanks.
Old 09-13-2010, 09:14 AM
  #5  
Bax
My Feedback: (11)
 
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,483
Likes: 0
Received 6 Likes on 5 Posts
Default RE: FS-91S No Pump, Needle Valve Setting

Arobatto: Those are the correct stock numbers.

Fullflaps: Start out with the needle at 2-1/2 turns out from closed. You'll have to lean the engine from there.
Old 09-13-2010, 11:21 PM
  #6  
Junior Member
 
Join Date: Sep 2010
Location: , BC, CANADA
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default RE: FS-91S No Pump, Needle Valve Setting

<u> Re: Needle setting </u>    Thanks Bax ~ I've just entered into Gas/glo- from <u>electrics</u>,  and needed a Jumping off point.(many Thanks again [8D]

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.