720/Kohlor carb

I have the engine timed on the money, she runs great, just need to know the final step. Horizontal cut of the top right hole? Bottom hole vertical cut? Can’t remember and can’t find the instructions! Dang it!
How deep to make the cut and if I’m correct?

Edited by AC720Man - 09 Aug 2024 at 7:25pm

1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

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

Finished up the carb upgrade over the weekend. Went well and I am happy with how she runs. A full test this week under load of the belly mower will prove that it can handle it. Did a short run with the mower and it did fine but want to do a full 1 1/2 acre test before I call it awesome. Did a compression test after installing new head gaskets after cleaning the carbon out. 112 psi so I’m tickled with that. Leak down test also showed no issues in the engine. Only has 689 hours on it

1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

I think more 4041 uses less gas with the carb change and it runs better

AC720Man wrote:

Onan’s like to drink gas but power takes fuel! If it uses less fuel then a great bonus, I don’t want to be down on power though. I will find out tomorrow.

Worn engines will burn more gas also.
I have a 10hp Kohler that burns oil terrible and also will burn a full tank of gas mowing the lawn (2.5 gallons) and I also have a 14hp kohler that I fully rebuilt ( bored .020” over, crank turned .010” under and the head shaved) and I can mow the lawn 2.5 to 3 times before refueling on the same gallons.
Sorry, I had to add my 2 cents… lol

1955 AC WD45 diesel with D262 repower, 1949 AC WD45

Still using the OEM ignition switch? That could possibly be the problem. I know when I talk to customer's over the phone about weak spark, running issues, and melted ignition switch plugs with these model Tractors, that junk ignition switch comes up quite often. I've had a few customer's replace that switch with my "real" ignition switch, and they said the engine runs so much better in the machine. Some small mods need to be made to install my switch, but till someone or something comes up that's better, for now, this is a big improvement. Makes me feel good as well as excited to know the new products I've been releasing for these models are working out well for our customers. The Onan Stater charging system isn't the best either. I'll be working on something for that this Winter... Thumbs Up

Steve@B&B

39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife

Wanted to close this episode out in case anyone is curious. I ended up with several issues unrelated to the carb which was causing me to think it was the carb upgrade. In the end, an almost new set of Onan points appeared to be the issue. I have also installed a piece of rubber hose on the post to feed the point voltage where it comes through the points box to ensure no arcing or grounding out there. New set of points, retimed and she runs well on the original carb. The new carb should run well also as it did before and I may reinstall it after I mow this week since it was an electrical issue and not the carb. This has been a pain to diagnose, run perfect one day and hardly start the next day. Also upgraded the key switch to the really nice set up that Steve sells. No doubt an improvement as my old switch was 40 years old and showing signs of corrosion on the back side. The short time I had the new carb on it, it ran very well but don’t feel like changing it out yet until I mow to make sure this has been resolved. The new carb is a great improvement as far as making adjustments. The little bit of test mowing with it on proved it performed well.

1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD

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