What Is The Point Gap On A 1992 John Deere 420 Garden Tractor

mputz

New member

Joined: Oct 20, 2013

Messages: 3

Location: Cameron

Tractor: 212 garden tractor

Can anyone point me to the tune-up specs for a 1974 lawn tractor. A manual for changing the points would be very helpful.

Thanks

jaotguy

Veteran Member

Joined: Dec 31, 2012

Messages: 1,198

Location: Ottawa, Ont

Tractor: Ariens

Kohler engine about 12 HP .020" for points .... look for S and T marks ... go to kohler website for replacement procedure ....

Think it was Kohler engine on my Gravely. It was 0.020".

Ralph

mputz

New member

Joined: Oct 20, 2013

Messages: 3

Location: Cameron

Tractor: 212 garden tractor

Kohler engine about 12 HP .020" for points .... look for S and T marks ... go to kohler website for replacement procedure ....

What is an S and T mark?

The S stands for spark, and the T is for TDC. Actually the starting gap on the points is .020 the gap can vary between .016-.024 to actually get the S mark to line up with the exact moment the point open. Best done with a timing light.

Code54

Elite Member

Joined: Aug 20, 2005

Messages: 4,012

Location: Putnam Co. West Virginia

Tractor: Kubota MX5100, Kubota BX25D, Kubota KX91-3, BCS 853, MULE FXT Pro

If it is a Kohler motor you can go on their website and they have a lot of the manuals on line for download.
Good luck

Wrenchin

Bronze Member

Joined: Nov 12, 2013

Messages: 76

Location: RI

Tractor: John Deere, Ariens, + more

set at .018 I have set most of the ones I work on at that and run just fine, are the points new or the old ones you are setting?

Even though the spec on the point gap on the Kohler engine on the Gravely, I recall that I had to set it closer (about 0.016") to get the points to close. Determined this with a light to tell when juice was on or off. With a bigger gap, the juice never got turned on to charge the condenser.

On any "pointed" system, try to find an electronic substitute. I had to do this on an Alfa 1300 cc engine. It kept burning the points up because they didn't align properly. I finally put a Hall electronic system on it.

Ralph

murphy1244

Super Star Member

Joined: Nov 25, 2011

Messages: 19,926

Location: Ohio

Tractor: Kubota 1120 RTV Kioti DK-40, MF-135, Ventrac 4500Y

We use the 10-20-30 rule. 10 air gap for flywheel, 20 for point gap and 30 for spark plug. And most match packs were .019 to .020 if you could not find anything else.