john deer 112 carb-govenor issue

300 dave

Member
hi all, i would really like some deep thought and good advice on this one. The machine is a JD 112, circa 1970, Kohler 10 horse, gas. THE PROBLEM: the engine cuts out and rpm drops right down to almost zero, then it picks back up to full throttle for about 10 seconds, then back down. It will repeat that until the fuel is gone. I thought maybe the throtle butterfly in carb was so wollarded out that it would flop sideways, causing the govenor to adjust. I held the buttefly rigid in my fingers and it still droped off, no change. But, I tried several carbs I have on hand and no difference.
Machine will idle nicely at LOW RPM for 30 minutes with NO funny stuff.
So, I think the fly weights on the govenor are finely wollard out and will not hold setting. Any thought? I really appreciate any comments or advice. thanks 300 dave
 
Is it with a fuel pump or gravity feed?

Is this a magnetto coil or a 12 volt coil?

A low battery could cause the 12 V coil not to work. And, you might be hearing the engine die, restart..

When it surges like that, I would say lack of fuel or governor.

Make sure governor arm is snug on shaft. To adjust governor, I look at an internal diagram of engine, make sure the piston for the governor is down all the way, open butterfly on carb all the way and that is the adjustment I use. Briggs and Tecumseh engines are cut and dry. The other brands are finicky when adjusting the governor so remember the setting you had beforehand.

The lack of fuel could be caused by a bad fuel filter, clogged fuel shut-off valve, clogged fuel lines, or clogged needle seat. Water ran thru the fuel filter will clog the paper filter.

You could try testing for lack of fuel by using choke to stabilize the engine or hold finger over carb throat and adjusting the air that it is allowed to have.

I have a briggs engine that I think the governor assembly is broken. Not sure how to know without looking inside the engine.

Also, try using a new sparkplug. Water will ruin a sparkplug too. If it is a points ignition, someone has mentioned that sometimes you need to set points differently to make the timing work out. Could be from a worn out points push rod.

Hopefully someone will know the correct holes the linkages go into. If it is anything like my 8 hp, you have 4 choices.
 
fuel pump kohler 10 horse
12 volt coil- borrowed from '67 VW
battery is old, but will restart machine by key fine, starts right up
"When it surges like that, I would say lack of fuel or governor."
i tried several carbs, 4 acutally and no change. Fuel bowls cleaned on all, no visable crap in fuel when i draw off a sample in glass jar.
"Make sure governor arm is snug on shaft."
Ya, but if lose, is it likely to repeat the process over and over like clockwork for about 1/2 hour? i kinda think not.
I am leaning toward the governnor itself.
I have a FARMALL M that had wollard out holes in the governor weights. Set at low idle it would jump to full throtle.
I gotta go back later
thanks



Hopefully someone will know the correct holes the linkages go into. If it is anything like my 8 hp, you have 4 choices.
 

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