Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

For those in the know


  • Please log in to reply
9 replies to this topic

#1 Phluphy OFFLINE  

Phluphy
  • Senior Member
  • Member No: 70148
  • 308 Thanks
  • 401 posts
  • Location: Central Gulf Coast Florida

Posted July 08, 2015 - 11:41 AM

Loping engine:

First, I only use non-ethanol gas, the loping eased considerably,would someone have made carb adjustments to compensate for something I haven't found yet?

Sprayed carb inside and out loping eased even more.

Checked, cleaned plugs, loping eased more and now the idle is too high i.e. as if it were on 1/4 throttle.

Checked compression...good @ 120-125, doesn't hold it long, few seconds

Tinkering with idle adjustment today.

Any recommendations?

BTW, this is a B&S model 422437 type 1209

 

Loping cured...someone had the idle mixture fiddled with, I suppose, in their opinion, to cure another problem.

Now it purrs, eh, such as a B&S does, definitely not a Onan.


Edited by Phluphy, July 08, 2015 - 03:47 PM.

  • MH81 said thank you

#2 Delmar OFFLINE  

Delmar
  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5039
  • 2,323 Thanks
  • 2,416 posts
  • Location: west central missouri

Posted July 08, 2015 - 11:51 AM

well, I know that on older Kohler engines with a walbro carb, the throttle shaft can cause some wear on the hole where the throttle shaft passes thru the carb.  they make a kit to replace the bushing where the throttle shaft goes thru there, and doing this repair will cut down on the air intake to the carb and stop the loping.  I did the bushing replacement on a carb for a k341 kohler on a john deere 316. once.  ran great, idled perfect after the repair.


  • Phluphy said thank you

#3 glgrumpy ONLINE  

glgrumpy

    Getting Out!

  • Senior Member
  • -GTt Supporter-
  • Member No: 8360
  • 6,663 Thanks
  • 6,480 posts
  • Location: Huntington, IN 46750 North East in State

Posted July 08, 2015 - 12:25 PM

This was that single vertical engine?  Does it have both idle mix and main jets to adjust?  Some may have just the main jet. Have you tried adjusting either one? Main is when wide open, the idle mix, not just the speed, the mix screw when idling. Best done when is warmed up. Governor's can be problem too, is it moving free and have good spring from it to the carb and not all stretched out? Water in gas tank and getting into carb? May need to pump or dump out the older gas, let it dry in the tank and start with good 91 octane fuel.


  • Phluphy said thank you

#4 Phluphy OFFLINE  

Phluphy
  • Senior Member
  • Member No: 70148
  • 308 Thanks
  • 401 posts
  • Location: Central Gulf Coast Florida

Posted July 08, 2015 - 12:46 PM

No glgrumpy, it's a B&S horizontal 18 hp twin.



#5 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted July 08, 2015 - 02:02 PM

Check the carb shaft, any play will cause lopeing. I have some lopeing with RED 18 opposed briggs while not under load, a little choke settles him down. Once I turn the deck on, I push the choke in and go WOT with no issues. 


  • Phluphy said thank you

#6 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted July 08, 2015 - 03:09 PM

Could you have adjusted the idle screw instead of the metering jet?  "loping eased more and now the idle is too high i.e. as if it were on 1/4 throttle."

 

http://www.mytractor...ing-solved.html


  • Phluphy said thank you

#7 Phluphy OFFLINE  

Phluphy
  • Senior Member
  • Member No: 70148
  • 308 Thanks
  • 401 posts
  • Location: Central Gulf Coast Florida

Posted July 08, 2015 - 03:54 PM

Could you have adjusted the idle screw instead of the metering jet?  "loping eased more and now the idle is too high i.e. as if it were on 1/4 throttle."

 

http://www.mytractor...ing-solved.html

That image is exactly what I have, and yes, it was the idle mixture screw I adjusted today.  Not even sure where the metering jet is.



#8 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted July 08, 2015 - 03:56 PM

That image is exactly what I have, and yes, it was the idle mixture screw I adjusted today.  Not even sure where the metering jet is.

I think the metering jet is fixed on the inside. I can check on one of mine when I get home.


  • Phluphy said thank you

#9 larrybl ONLINE  

larrybl

    Texas Member

  • Site Supporter
  • -GTt Supporter-
  • Contributor
  • Member No: 415
  • 4,955 Thanks
  • 3,328 posts
  • Location: Central Texas

Posted July 08, 2015 - 07:13 PM

OK, there are two types of these carbs. The old style has a metering adjustment screw, the new style has a fixed internal metering insert. Best you can do on the internal is to clean / replace it.

Attached Thumbnails

  • P1130481.JPG
  • P1130482.JPG
  • P1130483.JPG
  • P1130484.JPG

  • MH81 and Phluphy have said thanks

#10 Phluphy OFFLINE  

Phluphy
  • Senior Member
  • Member No: 70148
  • 308 Thanks
  • 401 posts
  • Location: Central Gulf Coast Florida

Posted July 09, 2015 - 07:34 AM

I think the metering jet is fixed on the inside. I can check on one of mine when I get home.

Yes it is a fixed jet.  After removing the plug I gave it a good dose of carb cleaner.  I wasn't aware of the name of that particular part until after you mentioned it.


Edited by Phluphy, July 09, 2015 - 11:17 AM.





Top