Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    Bronze Member
    Join Date
    Mar 2012
    Posts
    95
    Location
    Sioux City IA
    Tractor
    TYM T603 52' Ford 8N

    Default 20 hp B/S opposed twin surging

    I have a opposed twin cylinder 20 hp engine that will run great for about 15 mins and then start to surge. The surge will go away if I pull the choke a little.

  2. #2
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,629
    Location
    Nova Scotia, Canada

    Default Re: 20 hp B/S opposed twin surging

    Sometimes adjusting the tension on the governor spring will help??

    If the carburator has adjustment screws try making slight adjustment.
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  3. #3
    Super Member
    Join Date
    Apr 2000
    Posts
    6,209
    Location
    central New York
    Tractor
    all makes and models

    Default Re: 20 hp B/S opposed twin surging

    Quote Originally Posted by AroniaFarmer View Post
    I have a opposed twin cylinder 20 hp engine that will run great for about 15 mins and then start to surge. The surge will go away if I pull the choke a little.
    With the good gas that we recieve thanks to our government we are cleaning the carbs as quick as people bring them in. I don't know for sure at this point but I might agree with it being the governor spring which is a typical briggs issue.

  4. #4
    Veteran Member Jerry/MT's Avatar
    Join Date
    Feb 2008
    Posts
    2,003
    Location
    Western Montana
    Tractor
    New Holland TD95D, Ford 4610 & Ferguson TO-30

    Default Re: 20 hp B/S opposed twin surging

    Quote Originally Posted by AroniaFarmer View Post
    I have a opposed twin cylinder 20 hp engine that will run great for about 15 mins and then start to surge. The surge will go away if I pull the choke a little.
    Surging is usually caused by too lean a mixture. Try some enrichment on the main jet.

  5. #5
    Platinum Member
    Join Date
    Dec 2003
    Posts
    953
    Location
    GA, TN
    Tractor
    Kubota L4330HST

    Default Re: 20 hp B/S opposed twin surging

    Quote Originally Posted by Jerry/MT View Post
    Surging is usually caused by too lean a mixture. Try some enrichment on the main jet.
    True, but OP says it runs ok for a while before it starts to surge. I'd suspect some trash in the carb that is getting sucked up in/next to the main jet after it runs for a while. Does the carb have a removable bowl? If so, remove, rinse it out, and replace.

    A good dose of Sea-Foam also couldn't hurt.

  6. #6
    Veteran Member Carl_NH's Avatar
    Join Date
    Apr 2002
    Posts
    2,009
    Location
    Coastal NH
    Tractor
    01 Kubota B21TLB, 2010 Ferris 52" ZTR, Cub Cadet 1811, Gravely Super8

    Default Re: 20 hp B/S opposed twin surging

    If it runs OK for 15 minutes check the fuel tank cap - if the vent is plugged this is a symptom I have seen - runs fine for a while then starts to stutter. Clean the vent. Then clean and adjust carb as next step..

    Carl
    Kubota B21TLB, Ferris IS2000, Cub Cadet 1811

  7. #7
    Silver Member
    Join Date
    Apr 2009
    Posts
    144

    Default Re: 20 hp B/S opposed twin surging

    Clean the carb really really good and it wouldnt hurt to flush the fuel tank and lines. If it still does it after that you should look at the fuel pump, its probably on the way out.

  8. #8
    Gold Member
    Join Date
    Nov 2006
    Posts
    258
    Location
    Elk River, mn
    Tractor
    Yanmar YM1110D, John Deere 955

    Default Re: 20 hp B/S opposed twin surging

    Same thing with my briggs 14.5 twin. Worked on it today with carb cleaning.
    Didnt help.
    What i did discover though is that if the tank was full, the fuel is above the pump and gravity fed. 15minutes later, the fuel is now at pump level and the surging starts.
    Replace your fuel pump.

  9. #9
    Super Member crazyal's Avatar
    Join Date
    Dec 2003
    Posts
    5,877
    Location
    Northern Vermont

    Default Re: 20 hp B/S opposed twin surging

    I would look for a vacuum leak.
    Kubota L4240,Case 580K backhoe, Case 450 Dozer

  10. #10
    New Member
    Join Date
    Apr 2012
    Posts
    11
    Location
    Greenfield ny
    Tractor
    Ford 2810

    Default Re: 20 hp B/S opposed twin surging

    Same symptoms as my B&S twin . I bought the B&S carb rebuild kit and did the rebuild. Runs smooth as silk. I used a can of carb spray with the little straw to blow out all the jets and passageways. Whole job took less than an hour.

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 12
    Last Post: 11-21-2011, 09:20 PM
  2. Idle Surging
    By EddieWalker in forum Parts/Repairs
    Replies: 7
    Last Post: 07-22-2011, 07:21 PM
  3. TC-30 surging
    By Ken_W in forum New Holland Owning/Operating
    Replies: 2
    Last Post: 05-10-2006, 10:37 AM
  4. Briggs Opposed Twin 16hp - Not runnning smooth
    By jgbanshee in forum General Lawn & Garden
    Replies: 22
    Last Post: 05-21-2005, 12:40 PM
  5. Briggs 16Hp Opposed Twin L-Head
    By jgbanshee in forum General Lawn & Garden
    Replies: 6
    Last Post: 03-13-2005, 08:25 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.