(800) 853-2651
SHOP NOW

4020 gas ignition

I

isuvinny

Member
I can't get my 4020 gas to go. It has the Pertronix electronic ignition. This is a 1967 gas that has been converted to 12 volt with negative ground. I have fuel and I have spark. I pulled the wire off coming out of the coil and it sparks pretty well against the frame when turning over. I also pulled a couple plug wires off and they spark on the frame too. I pulled out all plugs and wire brushed them - they look decent. I even tried a few ether squirts and nothing. It has a gear reduction starter and really turns it over fast but no fire? How can I trouble shoot this? Do I need to check voltage to the coil? Someone mentioned running a wire direct from the positive on the battery to the coil to bypass the switch? Should I try this? I would appreciate any help. Thanks!
 
Did you try the plugs against the frame, and crank it checking for spark across the gap, if the tractor hasn't been run hard, idle's a lot the plugs go bad, which sounds like what's happening, not firing on either.
 

Wire brushing plugs is not a good idea but they shouldn't all be bad.
Plug wires sparking to frame doesn't guarantee the plugs are firing.
Pull some out to see if they are firing. Don't ground them near the
holes you could ignite gas fumes.
There's no need to check voltage if the plugs are firing. Check the
timing.
Are you sure you are getting gas into the engine? The plugs should get
wet when you choke it.
 
I have the same set-up on my 4020, & had lots of
trouble like you are having.

Turned out to be the original feed to the coil
had a resistance unit.
I had to run a new wire to the coil/ Pertronix.

Second thought---check battery voltage while cranking
engine. Should not be below 12.5 when cranking.
Are battery terminals clean---making good contact??
Jim
 
Forgot---is your carb equipped with a solenoid gas shut-off?
These can cause all kinds of problems. Check that the solenoid
clicks when ignition is turned on. Remove it to check if no click.
Jim
 
You must log in or register to reply here.

Similar threads

O
630 ignition issues
Replies
4
Views
371
PJH
P
F
John Deere 420w
Replies
6
Views
318
buickanddeere
B
B
Farmall 656 Gas no spark, has power to coil
Replies
7
Views
345
wore out
wore out
P
1972 JD 1020 gas 3cyl loses iginition when warmed up
Replies
12
Views
747
puterami
P
H
will 329 gas engine from 6600 work in 4020 gas
Replies
3
Views
429
Tx Jim
Tx Jim
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top