Farmall Cub

Have purchased a 1956 cub that i cannot get to run for any length of time. Starts up perfectly runs for a few minutes then cuts out. Plenty of fuel and spark. Any help would be most welcome. Thanks

Welcome to the board! By Kiwi Cub, do you mean from New Zealand? We have a few other members from down there here on the board.

Does pulling the choke out seem to help, or at least delay the tractor shutting off? Might try cleaning out the main jet.
Immediately after the tractor dies, does it still have a good spark? Might be the coil or condenser breaking down.

Spark appears to be ok and i have never had to use choke it has always fired into life without it.Yes l am in New Zealand i own a lifestyle block 25k out of Whakatane in the Bay of Plenty

Is vent in fuel cap working?

Welcome to the forum from Arkansas.
Plenty of fuel?
Dribble or good fuel flow.
There is only one or two reasons on a gravity system to not have good fuel flow, of 1/2 a line full or better. Hold a container under the carb and pull the main jet, turn on fuel and see if it shuts down to a dribble in a short time.

Welcome to the forum.

And thank you for teaching me a new word. I had to look it up.

A hobby farm (also called a lifestyle block in New Zealand) is a smallholding or small farm that is maintained without expectation of being a primary source of income.
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Welcome to the best Cub website on the planet!! I agree with most of the others. Sounds like a fuel delivery problem to me.

Otakiri:

G'day to you and congrats on acquiring your 1st new to you Cub.

Sounds like fuel starvation issues to me. Since you have just acquired it, I would be checking the entire fuel system .. check for dirt in the tank, check and clean the fuel sediment bowl, check and clean the screen at the carb inlet, check the main metering jet - ensuring both the horizontal and the tiny longitudinal orifice are clean and clear of blockages. Use a piece of soft copper wire such as twisted pair/telephone cable to clean the small orifice. Do not use tip cleaners.

Suggest that you may wish to follow the links below. We have a lot of resources here for our members.

to Farmallcub.com Forum Family. And you have come to the right place for all things Cub related. If you click on the Site Rules, Regulations, & Important Information, it will point you to the Welcome Wagon wherein you will find links to many useful sites and topics. One of the most important resources are Owner's Manuals, Parts Catalogs and Service Manuals. The Cub Manual Server is the home of the jpg versions and the [url=http://www.farmallcub.com/[ Sorry, direct links to manual section is not allowed. ]/index.php]PDF Manuals[/url] -- well the pdf's of course Enjoy!.