45 A update

bigboreG · Mar 29, 2015

A week ago I posted about my 45 A wanting to run away when at fast idle. So
yesterday I plowed with it for a few hours and it had a intermittent miss
under load. I suspected the model X mag was doing it, so I swapped it out with
a delco dist and flame thrower coil setup I had laying on shelf. Now it runs
without running away. Was the mag in some way or another making it act that
way? But the miss is still there. One plug is clean and tannish white, the
other is black gas fouled looking. Autolite 3116 plugs. I'm getting good spark
to the plugs, not sure why it has the miss under load. It puffs black smoke
when it misses, and with the alum pistons it kinda pings also. I run reg
unleaded gas. I put carb on a proven good runner, and it didn't miss under load like this one. Any help would be appreciated!

BushogPapa · Mar 29, 2015

I would try to Lean it some on the Main fuel adjustment.

The Black sparkplug was probably Clutch-side from Idling rich..(try running that circuit as lean as it will and not flame-out when a load comes on..

Loose Valve Guides can cause an intermittent miss and as I recall, the always did (especially the JD "D") an occasional miss while working..

Ron..

RandyB(MI) · Mar 29, 2015

With a properly operating governor , nothing will make it "run away" short of manually opening the butterfly. That's the whole reason for a governor. The miss? once a plug is fouled and insulator is all carbon it will ground the spark down the insulator. Clean it with a fine brush and brakeclean or carbon remover spray an blow clean. Test by swapping the plugs (before cleaning) an see if miss follows plug.

bigboreG · Mar 29, 2015

Ron it was the clutch side in fact. .I don't know about the running away deal. Its been doing odd things lately. I thought I knew these tractors pretty well, but starting to think they may be like a woman. . .and those I still haven't figured out!!!

BushogPapa · Mar 30, 2015

Both are a little alike, sometimes ya just don't KNOW why they got Mad at ya..(but they do some times)..!!!

The Dukester · Mar 31, 2015

Before I learned to use Autolite 3116 plugs and was still using the worthless Champions I used to foul the one plug on my '48 A...I believe it was the left one..anyhow I would just switch them and the "good" cylinder would clean up the oily fouled one and the tractor would run okay until the bad cylinder fouled it's plug, so I would switch 'em again and go..for a while. After putting in the Autolites the plugs never fouled again at all. My brother has the tractor now and I guess it has never bothered him, he's never said anything about it.

Lee B · Mar 31, 2015

With Randy on the governor advice, another method to use on fouled plugs is to mount them in a vise by their spark plug wire end and heat them carefully until red hot. This will burn off the fouling but it will also take out the thin metal gasket if so equipped and will also melt down your ground electrode if you get to carried away with the heat. Propane touch will work with little worries but takes a good deal of time.

I'd buy the old girl a new set of spark plug wires. Sound like the right side might have a spark leak under compression - you did know that compression increases the voltage? Laying the plug on the side of the engine just tells you it sparks when the plug is not in the engine. The increased voltage in actual use may just be enough to make it jump into the conduit on occasion. If the wires are ten years or older, they are highly suspect.

45 A update

bigboreG

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BushogPapa

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RandyB(MI)

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bigboreG

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BushogPapa

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The Dukester

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Lee B

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