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Old 07-08-2015, 07:35 AM   #1
sparky2weld
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Join Date: Dec 2014
Posts: 21
Default Old Harley Gas Carts

Hello All, what a site!!!! Good info. Got a challenge on my Harley carts, believe it is a 74 and other 67 but will have to verify.
1. On a real hot day after it has been running for awhile, it will shut off just as if the ignition switch was turned to off. If I let it set for just a few seconds, it will take off again, then shut down again. Then repeat and repeat and repeat until I leave it off for some time. Never happens in cold or cool weather.
I have heard there is a circuit breaker on these and it sounds like it may be the culprit. Hard to trouble shoot when it wants to run after being off for a few seconds. Would you agree I am on the right track and if so where do I source one?
2. The other cart (believe 67) has been sitting for a long time, maybe close to 20 years. Turns over and has spark, but I was advised it had a lack of speed or power then quit so they parked it. Ran a compression check, lost the paper work but is was about 100 on both cylinders with little variance. Also advised that probably the diaphragms in the carb would need replaced. I have rebuilt many single barrel on tractors but never a diaphragm type. Any source on good rebuild kit? Hate to replace with an off shore type, but will do if need be. Also, I do not see any signs of seals around the fan or clutch leaking so I assume good vacuum.

Two of the screws holding the point cover sheared off, even after working softly. Thinking of LIGHTLY spot weld (TIG) a small nut on and turn them out. Works nearly every time on cast parts.

Any help would be appreciated.

thanks, Old Pop

Last edited by sparky2weld; 07-08-2015 at 07:37 AM.. Reason: correct content
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Old 07-08-2015, 08:24 AM   #2
73eldo
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Harley Davidson
 
Join Date: Jul 2014
Location: St. Paul Minneapolis MN USA
Posts: 522
Default Re: Old Harley Gas Carts

I don't think the circuit breaker would reset that fast. My guess would be the coil.

100 should be good compression. Tillotson was the OE carb manufacturer and they are still around so it should not be that difficult to get a genuine rebuild kit and parts. They are easy to rebuild. Only odd thing I have seen is if someone really cranked down on the screws the area with the threads bumps up a bit. I just used a fine file and carefully brought those areas down so they were flush with the rest of the body. One of mine also had the throttle shaft badly worn. I expected the bore to be worn too but it was not. They made the shaft softer than the body so it does not wear like most carbs. Pretty good design I thought.
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Old 07-08-2015, 10:21 AM   #3
sparky2weld
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Default Re: Old Harley Gas Carts

Quote:
Originally Posted by 73eldo View Post
I don't think the circuit breaker would reset that fast. My guess would be the coil.

100 should be good compression. Tillotson was the OE carb manufacturer and they are still around so it should not be that difficult to get a genuine rebuild kit and parts. They are easy to rebuild. Only odd thing I have seen is if someone really cranked down on the screws the area with the threads bumps up a bit. I just used a fine file and carefully brought those areas down so they were flush with the rest of the body. One of mine also had the throttle shaft badly worn. I expected the bore to be worn too but it was not. They made the shaft softer than the body so it does not wear like most carbs. Pretty good design I thought.
Thanks for the reply. I initially thought about the coil but way back when before electronic ignitions I had a coil act like that and it was inop for several minutes not seconds. Made it easy to diagnose. Hate to just throw parts at it but I suppose I could take the coil off the spare cart and see what happens....assuming it is good. Are there any printed standard ohm readings I can take check with? Sure would like access to some spec data.

OK I will pull the carb, clean and take a look. I assume these machines are similar to other small two stroke and the exhaust could be blocked a bit, not sure. Probably would not hurt to have a look. Thanks again.
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Old 07-09-2015, 11:37 AM   #4
Lochlin
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Default Re: Old Harley Gas Carts

Regarding the stopping, sitting a few minutes, then starting again, I had this exact thing happen to me a couple of summers ago (albeit on an 80's Columbia cart). My issue ended up being a mostly disintegrated fan. Because of the lack of a fan my cart would run until it overheated then stop. It would start again after sitting for a bit and having just enough time (a minute or two) to cool back to running temperature. It would bog to a stop after it overheated again in 30 secs or so. I checked and found that the fan was rusted and most of the fins had detached. The fan was still spinning but with the detached fins it wasn't moving any air. A new fan solved the problem. Fortunately, no engine damage resulted from the overheating. Something you may wish to consider.

If you are pretty confident your seals are good you may want to consider adding an electric fuel pump rather than replacing the diagrams in that carb? I am a broken record regarding the electric pumps but I have such great results with them I automatically install them on everything I own.
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Old 07-09-2015, 01:16 PM   #5
engelking
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Default Re: Old Harley Gas Carts

You can download the service manual from

"buggiesgonewild.com/columbia-parcars/Manuals-HD-Service/HD_Manual_Service_1963_1980_GS.pdf"

Sorry I can't post links yet

It has the ohm readings for the coil
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Old 07-09-2015, 07:21 PM   #6
sparky2weld
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Default Re: Old Harley Gas Carts

Quote:
Originally Posted by Lochlin View Post
Regarding the stopping, sitting a few minutes, then starting again, I had this exact thing happen to me a couple of summers ago (albeit on an 80's Columbia cart). My issue ended up being a mostly disintegrated fan. Because of the lack of a fan my cart would run until it overheated then stop. It would start again after sitting for a bit and having just enough time (a minute or two) to cool back to running temperature. It would bog to a stop after it overheated again in 30 secs or so. I checked and found that the fan was rusted and most of the fins had detached. The fan was still spinning but with the detached fins it wasn't moving any air. A new fan solved the problem. Fortunately, no engine damage resulted from the overheating. Something you may wish to consider.

If you are pretty confident your seals are good you may want to consider adding an electric fuel pump rather than replacing the diagrams in that carb? I am a broken record regarding the electric pumps but I have such great results with them I automatically install them on everything I own.
For sure, will look at it tomorrow. It stops, but only for a few seconds then starts but shuts right down in a few seconds, thats why I was leaning towards electric, but your comment is well taken and appreciated. Thats a good tip to keep in the archives. Will report later on fan condition.


So I guess you are saying the culprit on the carbs is normally the diaphragm that governs the fuel pump? Interesting. May I take this to the next level and ask an electric pump source etc.? Another good tip, thanks

Last edited by sparky2weld; 07-09-2015 at 07:24 PM.. Reason: correct content
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Old 07-09-2015, 07:22 PM   #7
sparky2weld
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Default Re: Old Harley Gas Carts

Quote:
Originally Posted by engelking View Post
You can download the service manual from

"buggiesgonewild.com/columbia-parcars/Manuals-HD-Service/HD_Manual_Service_1963_1980_GS.pdf"

Sorry I can't post links yet

It has the ohm readings for the coil
Many thanks again. I will do that.
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Old 07-10-2015, 12:09 AM   #8
73eldo
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Default Re: Old Harley Gas Carts

I brought up the coil because it recently happened to me. Cart would start and run normally when it was dead cold and somewhat warm both ambient and engine. If I ran it hard or ambient temps were high it would not quit but if I stopped for a couple minutes it would not restart. IF I let it sit for maybe 15 mins it would start right up or if I kept cranking for 10-15 seconds it would eventually kinda start. Swapped in a different coil and that issue went away.
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Old 07-10-2015, 12:19 AM   #9
tew45
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Default Re: Old Harley Gas Carts

The auto reset breaker is a good choice to check. I usually replace them when a cart is worked on for electric problems. They can be bought locally at RV places. Carb and fuel pump parts can be found at local lawn mower repair shops. Be sure to clean the cooling system of grass and fluff.
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Old 07-11-2015, 07:55 AM   #10
sparky2weld
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Default Re: Old Harley Gas Carts

Quote:
Originally Posted by engelking View Post
You can download the service manual from

"buggiesgonewild.com/columbia-parcars/Manuals-HD-Service/HD_Manual_Service_1963_1980_GS.pdf"

Sorry I can't post links yet

It has the ohm readings for the coil
Got it thanks, that will help. At first blush I did not see color codes for the wiring but I imagine it is in there somewhere, thanks again

EDITED: Found the color code, thanks

Last edited by sparky2weld; 07-11-2015 at 08:27 AM.. Reason: correct content
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