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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
Show Parts for Model:

77 backfiring

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Author  [Modern View]

09-11-2017 09:31:43

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Working on a 1950 77 that had a lot of electrical issues and a fully gunked TSX carb. Had the carb cleaned, points and condenser applied with new plugs. Old plugs were badly fouled. Coil seemed weak so a known good one applied. Starts lovely with about 1/3 throttle and choke on, instant fire up. After a minute or so, it begins an irregular backfire with flame from carb intake. I enriched the main and idle jets a bit, but didn't seem to make a difference. I think there may be some cross firing in the plug wires which I'll address, but I don't want to dink much with the carb without some insight from people who know. What would you all recommend?

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09-13-2017 09:14:28

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
First question might be : does it start and run on all six? I would suspect a valve problem if it is only running on five.

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09-13-2017 04:27:27

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
if it's a cylinder pull the plug wire to each, one at a time while running (be careful). When you get the to problem it will stop backfiring.

gas is igniting outside of a cylinder with both valves closed...through the carb is an intake problem...retarded ignition time...just wouldn't run right if the carb wasn't set right.

could be a cracked cap effected as it heats up.

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09-13-2017 03:57:34

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
After start up is choke pushed in all the way? If so try leaving choke pulled out part way if tractor runs with choke part way out you have carb problem. Let us know if it runs this way

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09-12-2017 06:31:10

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
It could also be carbon on the inside of the distributor cap. Might need to replace it.

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Traditional Farmer

09-11-2017 19:29:35

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
Could be an intake valve adjusted too tight

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09-11-2017 12:36:50

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 Re: 77 backfiring in reply to susandiane, 09-11-2017 09:31:43  
A back fire like that can be caused by having the points set wrong or timing off a bit or sticking valves

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