1956 420
1956 420
starts and runs properly when cold, after working(plowing and discing) for approx 1/2 hr, begins to misfire and eventually stops and wont start till cools down for overnight, has plenty of gas running out the carb drain when opened, has spark but very weak, what would you think might be the cause, thanks
- Stan Disbrow
- 350 crawler
- Posts: 2898
- Joined: Fri Jul 15, 2005 3:13 pm
- Location: Raleigh, NC
Hi,
Sounds like cracks in the insulator tips of the spark plugs. Modern ethanol laced gas can detonate and cause microcracks to form. Been there, done that.
Stan
Sounds like cracks in the insulator tips of the spark plugs. Modern ethanol laced gas can detonate and cause microcracks to form. Been there, done that.
Stan
There's No Such Thing As A Cheap Crawler!
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)
-
- 2010 crawler
- Posts: 622
- Joined: Tue Mar 30, 2010 8:02 am
- Location: Steubenville, OH
My Experience
I had a similar situation.
I did the following - not exactly sure which one fixed it.
New Distributor Cap
New Points / Condenser
New Wires
New Rotor
New Coil
New Resistor
Fixed the problem completely - Based on what I was getting in feedback here I suspect the coil was the problem but It all needed to be changed anyway.
Mike
I did the following - not exactly sure which one fixed it.
New Distributor Cap
New Points / Condenser
New Wires
New Rotor
New Coil
New Resistor
Fixed the problem completely - Based on what I was getting in feedback here I suspect the coil was the problem but It all needed to be changed anyway.
Mike
If man can break it man can fix it .. it just takes time and money.
- gregjo1948
- 350 crawler
- Posts: 1000
- Joined: Mon Aug 30, 2010 5:58 am
- Location: Newark Valley,NY,USA
420 update
changed coil and condenser and it runs as it should again. thanks for all the input
-
- 1010 crawler
- Posts: 258
- Joined: Wed Sep 11, 2013 3:34 pm
- Location: Shiner, texas
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