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rrhead(SD) 
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Joined: 11 Sep 2009
Location: Canton, SD
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 Topic: 720 new carburetor
Posted: 14 Apr 2021 at 5:58pm |
I bought this kohler carburetor last fall and just installed it today. Took awhile but got it adjusted right and ran better than ever. I do need to make some modifications. The throttle control arm is about 1 inch to the right of carb. Does not line up to work correctly. Any suggestions on solving this problem would be appreciated. Thanks. rrhead(SD)
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2 WDs,WD45,D-14,D-17,D-19D,180,7020,6080FWA,6080 2wd, 6080 2wd(cab),8050FWA,8550,4W-305,Massey 8250. Gleaner L3, R62 &R65 Agco-Allis 1616H & 1920H, AC 720, Terra-Tiger
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dee_veloper
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Posted: 15 Apr 2021 at 1:08am |
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Almost looks like it's missing a piece in between. Perhaps rig an "L" shaped piece to bridge the gap (?)
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Steve in NJ
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Joined: 12 Sep 2009
Location: Andover, NJ
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Posted: 15 Apr 2021 at 7:57pm |
I would say, bend a dog leg in the threaded rod, pick yourself up a coupler to screw onto the rod and add a little more threaded rod to the heim end to reach the Carb ball. Viola! Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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orangeman
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Posted: 16 Apr 2021 at 7:01am |
RRHead (SD): Would you mind sharing the model number or part number for the Kohler carb?
Orangeman
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rrhead(SD)
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Location: Canton, SD
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Posted: 16 Apr 2021 at 7:19am |
Thank you for the responses. I got it to work yesterday by taking the ball connector off the old carburetor and putting it on the new one. It was about 1/2 inch longer and the throttle rod is still at an angle but worked fine. I bought the new carburetor on E-bay and was under the name Kohler K482 K532. Here is a link to one. Don't know if this is the same seller or not. Thanks again. rrhead(SD)
Edited by rrhead(SD) - 16 Apr 2021 at 7:19am
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2 WDs,WD45,D-14,D-17,D-19D,180,7020,6080FWA,6080 2wd, 6080 2wd(cab),8050FWA,8550,4W-305,Massey 8250. Gleaner L3, R62 &R65 Agco-Allis 1616H & 1920H, AC 720, Terra-Tiger
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Bird76Mojo
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Posted: 16 Apr 2021 at 9:23am |
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Did you perform the modifications to the inlet side of the carb body? I know that others have had to use a dremel tool to open up access to an air passage on the inlet "mouth" of these carbs. Essentially making it match the old carb.
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rrhead(SD)
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Posted: 16 Apr 2021 at 9:53am |
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Yes, I did the modifications. I printed off the instructions for the mod, but I had someone else do it for me. I am sure someone on here knows the procedure. It now runs better than it has for a long time. rrhead(SD)
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2 WDs,WD45,D-14,D-17,D-19D,180,7020,6080FWA,6080 2wd, 6080 2wd(cab),8050FWA,8550,4W-305,Massey 8250. Gleaner L3, R62 &R65 Agco-Allis 1616H & 1920H, AC 720, Terra-Tiger
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JoeO(CMO)
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Posted: 16 Apr 2021 at 6:01pm |
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I looked at my 720 and the link is at that angle. Looks original to me!
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
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Posted: 17 Apr 2021 at 10:47am |
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I had bought an Ebay Kohler carb for my 720 a couple of years ago, and am concenred I didn't get one that is big enough. The venturi diameter was noticeably smaller than the old carb, and it certainly cut down the power output. I like the adjustability of the load jet being on top, but I'm not liking the low power, it's like a 16hp level now, and it won't pull the 60" mower and itself up my hill it used to fly up. Maybe it's a combination of my points getting tired again too, but I noticed it the day I put the new carb on. It really struggles with the mower! Anyone else have this issue? I'm willing to buy a different carb. Thanks!
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Steve in NJ
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Posted: 18 Apr 2021 at 7:20am |
It very well could be that that particular Carburetor is a bit on the lean side if you're not producing the power the engine made with the OEM Carb. Those Onan engines are pretty large in the lung department, so more air/fuel may be needed to make the darn near 20HP is supposed to produce. Ya gotta' figure, a Carb for a 16HP engine is gotta' be smaller than one for a 19.5HP engine. I have a spare Carb off my parts 620. When I git' some time I'll havta' measure the venturi and do a little R&D on a replacement Carb that will work if the original isn't available anymore......
Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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rrhead(SD)
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Posted: 18 Apr 2021 at 8:37am |
I had been fighting the loss of power for a couple years. Mowing, it would lose power going up inclines. Have not mowed with it yet this year but used a drag section on garden and never lost power. InjpumpEd, did you do the modification on the carb before installing? Maybe that's what it corrects. rrhead(SD)
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2 WDs,WD45,D-14,D-17,D-19D,180,7020,6080FWA,6080 2wd, 6080 2wd(cab),8050FWA,8550,4W-305,Massey 8250. Gleaner L3, R62 &R65 Agco-Allis 1616H & 1920H, AC 720, Terra-Tiger
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IBWD MIke
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Posted: 18 Apr 2021 at 8:39am |
Had fuel problems with my 720 when I brought it home. I really think that's why the p/o sold it. Took a long time but I found an 'affordable' kit. Still almost 50 bucks! Runs like a champ now.
I have one of the cheap E-bay carbs on a 1450 cub. Bought it for the 1650, wound up rebuilding it's original. The cheap one seems to work ok but I prefer the originals if you can keep them working.
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injpumpEd
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Posted: 18 Apr 2021 at 2:44pm |
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I have the orig to measure against, and that was how I knew it was smaller. I did a couple of mods to make it work, and it runs fantastic, just low on hp. It seems to be close on A/F ratio, just less of the air. The linked ebay one above is for a 23hp Kohler, so that may be a much better option for me. I really don't remember what the one I got was meant to fit.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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injpumpEd
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Posted: 28 May 2021 at 8:47am |
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Just to update, I went ahead and bought the 23hp Kohler one linked above for less then $30. It is indeed larger than the previous one I'd bought from ebay, from links on here as well. New one is same bore as original carb. I did get it swapped, and it runs better, but I can tell my points still need attention, as it sounds like the timing is late by the exhaust note, and laboring. I wish electronic conversion was a simple deal on these lol!
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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HudCo
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Posted: 02 Jun 2021 at 9:56am |
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has any one thought a zienith carb off of a 1770 v4 wisconsin
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Bird76Mojo
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Posted: 03 Jun 2021 at 12:56am |
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Don't forget, these Onan's were severely under-rated in the HP department. According to bore size these should put out roughly 26HP when new, with the HP limiting being done by overall flow from the intake manifold, carb venturi, and exhaust size.
It would take a 26-30HP modern v-twin engine to match the torque these Onan engines produce.
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Steve in NJ
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Posted: 03 Jun 2021 at 6:52am |
I musta' missed the post about the modifications on the new Carb. What mods need to be done? There's a sheet on what mods to do? Tell me more....... Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Bird76Mojo
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Posted: 03 Jun 2021 at 9:01pm |
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rrhead(SD)
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Posted: 04 Jun 2021 at 6:36am |
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Thank you for posting these links. The first one is the one I copied and had someone else do the mods. I now have them saved on my computer. rrhead(SD)
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2 WDs,WD45,D-14,D-17,D-19D,180,7020,6080FWA,6080 2wd, 6080 2wd(cab),8050FWA,8550,4W-305,Massey 8250. Gleaner L3, R62 &R65 Agco-Allis 1616H & 1920H, AC 720, Terra-Tiger
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Steve in NJ
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Posted: 07 Jun 2021 at 8:40am |
Oh okay. No wonder I missed the info. Its on facebook. I don't do fb. Thanks for the info! Steve@B&B
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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Turbooutlaw
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Posted: 31 May 2023 at 7:52pm |
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Steve, I can send you the info. I wrote the doc. Your pal Jesse. 😜 Small world.
Edited by Turbooutlaw - 31 May 2023 at 7:54pm
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