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grandpa Love

grandpa Love

Well-known Member
I have slipped and bumped my head....there is a JD 420 in my yard. Belongs to an elderly friend of mine,he asked us to get it running. Wife cleaned carb. I checked for spark, none, coil, points, condenser,and rotor button fixed that. Was almost stuck, couldn't rock it in gear and make it turn. Pulled plugs, poured in transmission fluid,let sit a few hours and it finally turned with us rocking it in gear. Tried cranking it, starter got hot so we pulled it around with a far superior Ford! Lol. It's running, but only 30-40 seconds at a time. Seems ok then backfires out the carb and dies. Couple times it shot fire out the exhaust and then poofed out the carb and died. Any thoughts? No matter what we do I swear it's only running on 2 cylinders!!! Lol.
cvphoto104771.jpg

Grumpy Deere
 
Pour some ATF down the exhaust and let it sit over night and even better if you can do so to the intake valves good chance there sticking as they warm up
 
that was done and with all that smoking it has had lots of lube. get some wrenches on it. oil in the fuel would do more good.
 
That's what I was thinking. Stuck intake backfires through cab.
Stuck exhaust backfires through exhaust,
Did you check timing?
 
Pull the rocker cover and look at the rocker shaft, On those 2cyl JDs the rocker shaft liked to crack at the bolt holes and then angle upwards and mess up the valve opening.
BTDT when we had a 420U from 1956 to 1969. If you are good with a welder you can weld the shaft and re-drill the hole.
 
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