[Wade1965]

I have a 1966 3020, propane. Was not started for 2 years. It now starts fine, runs great for 10 minutes. Then starts to miss and sputter. So when warms up it barely runs. I’m not mechanical at all, but wanted to give this a shot.
WadeMcCoy

 

[Sundancer268]

I would check the ignition in particular the ignition coil, as it heats up, it could start to fail. You can get a spark tester rather cheaply and I would hook it up to an easily accessible spark plug wire and watch the spark. It should be a bright blue and as it fails, it will start to get more to the yellow color. If that vintage has points, the condenser could also be breaking down under heat.

 

[DRobinson]

Welcome from northeastern Pennsylvania.

I think you will get better response if you repost under Agricultural Tractors. A moderator can help you move it.

 

[Tx Jim]

Welcome to GTT
Ditto on faulty ign coil or condenser.

 

[gary ca]

Welcome to GTT
Ditto on faulty ign coil or condenser.

I have a 1966 3020, propane. Was not started for 2 years. It now starts fine, runs great for 10 minutes. Then starts to miss and sputter. So when warms up it barely runs. I’m not mechanical at all, but wanted to give this a shot.
WadeMcCoy

If the ignition checks out, I would look into the propane delivery system. Not sure how it works on a 3020, but a typical propane conversion has a filter and a converter that converts liquid propane to vapor.