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Discussion Starter #1
My 1420 (gas) has been flawless..with the exception of a few coils over the years.
Now it's really acting strange.
I start it up and it runs perfectly for 5 minutes or so. Then it disengages the mower 8-10 times over a period of 5 minutes or so. Then for a few minutes the engine will "burble" and sometime a mild backfire...then suddenly it runs perfect for as long as I care to mow.
And it follows the same pattern everytime I use it. Been doing it all summer...
I'm at a loss..any thoughts ??
 

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First, I know absolutely nothing about a 1420 (other than Tractor Data says its a diesel!), but I'm familiar with engines in general.

I'd say your problem is fuel related. If electrical, I don't think it would "fix" itself, but only get worse as the engine got warmer. I'd start with fuel supply from the tank. Remove line at fuel pump from tank to pump and drain fuel into clean container. Check container for contaminates and monitor flow from tube/hose...should be steady and constant. If poor flow, check fill cap vent and/or strainer (???) in fuel tank.

As a last resort, rebuild carb. Sorry, that's all I've got! Bob
 
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Discussion Starter #3
It's a 1420 front mount mower with 3 cylinder gas engine. I've removed the gas tank and thoroughly cleaned it. Replaced the fuel filter.
Disassembled the carb and cleaned it...Don't think it's fuel related..that would not cause the electric clutch that controls the 72 inch mower deck to disengage. Symptoms described occur in the same fashion over the same timeline.
20 minutes into the cycle the mower runs perfectly for the rest of the day.
If I shut it down for 45 minutes the whole cycle repeats itself...
 

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It's a 1420 front mount mower with 3 cylinder gas engine. I've removed the gas tank and thoroughly cleaned it. Replaced the fuel filter.
Disassembled the carb and cleaned it...Don't think it's fuel related..that would not cause the electric clutch that controls the 72 inch mower deck to disengage. Symptoms described occur in the same fashion over the same timeline.
20 minutes into the cycle the mower runs perfectly for the rest of the day.
If I shut it down for 45 minutes the whole cycle repeats itself...
Just found this one online: try it maybe it helps????
Check the underside of the unit for caked on grass. Excessive grass under the deck will make the mower sputter. Remove the spark plug using a wrench to prevent the mower from turning on while working underneath. Scrape the grass off using a paint scraper.
 

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Does your machine have a safety switch in the seat?

When you mentioned the mower turning off and the engine sputtering like it’s losing ignition, that makes me think of a seat switch acting up. On my old 316 garden tractor, standing up off the seat while it’s in gear will turn off the pto and cut the ignition to the engine. It would explain what’s happening, although I admit it’s weird that it would have such a strange repeatable pattern.
 

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Discussion Starter #6
I eliminated the seat switch years ago so it's not an issue with the current problem...
 
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