Spark plugs

1974vette · Nov 11, 2019

Need new plugs for a w9 lp. original plugs are champion w10 with other brands available. I want the "hottest" plug available for the lp system. Looking for suggestions on the best plug and brand for my application.
Another question for the lp system is which would be best a mag or distributor?
Thanks for all the info and advice i get from all you fellow tractor gurus.

K-Mo · Nov 11, 2019

If you don't find you don't find your make and model in "Tractors" try "Wheel Tractors"
Autolite Look Up

1974vette · Nov 11, 2019

I can find both autolite and champion. There has been discussion on this forum about some types of plugs being not so dependable.
Is there a brand that seems better than others?

K-Mo · Nov 11, 2019

I don't know about any factual basis, but many shy away from Champion. Years ago, I had experiences causing me to question Champion. I have since used Autolite.
You mentioned heat range. When you look up the W9, you can click on the Heat Range "18" and it will give you a heat range chart. Find the 425 and it also gives you a non-resistive option as well as heat range.

1974vette · Nov 11, 2019

Thankyou

rustyfarmall · Nov 11, 2019

(quoted from post at 07:18:37 11/11/19) I can find both autolite and champion. There has been discussion on this forum about some types of plugs being not so dependable.
Is there a brand that seems better than others?

In this day and age, with quality control sorely lacking, ANY brand could be very good, or very bad right out of the box. A few years ago I was partial to Autolite, but I haven't used a tractor enough in the last several years for any of them to need a tune-up.

DR. EVIL · Nov 12, 2019

I really haven't had any problems with Champion plugs. I have them in everything except my new car & pickup. I have had problems with Autolite, had a broken insulator on the firing end of a Motorcraft plug made by Autolite in a brand new Ford pickup. I put Champions in it on every plug change after that.
I have used NGK plugs a couple times when I couldn't find Champions.

I think the biggest problem with Champion plugs is everybody tries to run D-21 plugs. WAY too hot a plug. Like TractorVet says, if your Farmall runs with D-21 plugs, Something is wrong with it!

rustyfarmall · Nov 12, 2019

Some folks install new plugs in a tractor that has not ran for several years and has a lot of carbon build up in the cylinders. The tractor starts up and runs, but then that carbon starts to loosen up and floats around, eventually fouling a spark plug, and immediately the spark plug gets the blame. If it was a Champion, then Champions are no good at all. Same thing if the plug was an Autolite. All that is needed is to remove the fouled plug, clean it up and reinstall.

Spark plugs

1974vette

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