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Re: 420 won't start

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Author  [Modern View]

07-23-2013 07:06:05

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No spark while cranking due low system voltage. Too small battery, undercharged battery, too small cables and high resistance connections somewhere. What is the coil"s primary winding ohms? What is the battery and coil polarity?

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JD Gimpl

07-23-2013 08:13:18

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 Re: 420 won't start in reply to buickanddeere, 07-23-2013 07:06:05  
The battery is a 6 volt that is 2 years old. I had replaced the cables then as well. It is a positive ground system.

The coil is original from when I bought the tractor 12 years ago. How do I check ohm's?

Thank Gimpl

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07-23-2013 14:33:06

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 Re: 420 won't start in reply to JD Gimpl, 07-23-2013 08:13:18  
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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