720/Kohlor carb
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=202655
Printed Date: 21 Nov 2024 at 2:51pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 720/Kohlor carb
Posted By: AC720Man
Subject: 720/Kohlor carb
Date Posted: 09 Aug 2024 at 4:37pm
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Forgive me for being lazy but I can’t find the modification procedure for the Kohlor carb to install on my 720. Dremel tool mod for the intake horn I think? Thanks for any help in advance. Rob ------------- 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 |
Replies:
Posted By: AC720Man
Date Posted: 09 Aug 2024 at 7:17pm
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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? ------------- 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 |
Posted By: Steve in NJ
Date Posted: 09 Aug 2024 at 10:01pm
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Hey Rob, Can't help ya with the Carb, but was wondering how you made out with the Hurricane? ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |
Posted By: rrhead(SD)
Date Posted: 10 Aug 2024 at 8:52am
------------- 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 |
Posted By: AC720Man
Date Posted: 10 Aug 2024 at 10:16am
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Thank you Rod!! Just what I needed. Steve, we finally got some rain. 4.20” within 24hrs. 2” of it was a nice steady rain that really soaked in, the other was a massive downpour but thankfully no wind. River and creek came up but caused no issues and it started receding last night. Stayed within the banks on our farm so we were obviously relieved. Folks within 10 mile radius did have some flooding issues and some are still without power. Thankfully we never lost power. Thanks for asking ------------- 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 |
Posted By: AC720Man
Date Posted: 19 Aug 2024 at 3:11pm
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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 |
Posted By: jaybmiller
Date Posted: 22 Aug 2024 at 8:43am
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I’m sure the full test with the mower will confirm it’s running as smoothly as it sounds ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: tadams(OH)
Date Posted: 22 Aug 2024 at 2:25pm
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I think more 4041 uses less gas with the carb change and it runs better |
Posted By: AC720Man
Date Posted: 22 Aug 2024 at 7:49pm
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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. ------------- 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 |
Posted By: 55allis
Date Posted: 24 Aug 2024 at 11:49pm
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 |
AC720Man wrote:Posted By: AC720Man
Date Posted: 02 Sep 2024 at 9:33am
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Still having issues getting the 720 running properly, even starting. One day it started and ran great, next day it won’t start only sputters. Beginning to think I have another issue. Timing is spot on, new Onan points and condenser, spark plugs, Onan plug wires. Fuel pump conversion last year. I do notice what I think is weak spark. Tested the coil per the manual and it ohms right where it should. I guess I could pull the coil off my other 720 and try it. Is there something I’m missing? Any thoughts would be appreciated. ------------- 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 |
Posted By: Steve in NJ
Date Posted: 02 Sep 2024 at 10:27am
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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...  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 |
Posted By: AC720Man
Date Posted: 02 Sep 2024 at 8:46pm
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Good point Steve, hadn’t thought about the key switch. Now that you mentioned that I replaced the one on my other 720 about 10 years ago. Will give you a call tomorrow. Thanks ------------- 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 |
Posted By: AC720Man
Date Posted: 18 Sep 2024 at 5:05pm
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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 |