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John Deere Tractors Discussion Forum
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Re: 420 won't start

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Author  [Modern View]

07-23-2013 14:33:06

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What is the CCA rating of the battery?
What size of cables?
Where is the chassis return/ground bolted to? Coil's + should be connected to the distributed and through to the points. Using an ohm meter. A six volt coil will measure approx 1.5 to 2.0 ohms across the primary terminals. A 12V coil will measure approx 3.0 to 4.0ohms.

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JD Gimpl

07-24-2013 18:09:07

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 Re: 420 won't start in reply to buickanddeere, 07-23-2013 14:33:06  
Hi buickandeere

I got the 420 started by towing it and bump starting it. It runs anywere from 2 minutes to 5 minutes fine and then starts missing or choking out like it is running out of gas. I pulled the plug on the bottom of the carb and fuel pours out of it fine. If I am quick with the choke I can keep it running most of the time.

This tractor has run flawlessly for the past 8 years so I am puzzled. Seems like it could be electrical or fuel.

I took the carb apart twice and it looked perfect inside so I am really wondering where to start.

Any advice would be appreciated.


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