Wd45 Spark Plugs

If they are dry then it's running rich.  If wet then it's oil.

If they are dry then probably not rich. Color is important. Should be sort of tan color. If sort of dark or black then could be a bit rich. many of these units now don't do much except idle around or pull small trailer so spark plugs may not look the same as when the motor is worked hard all day. Very hard to see on those huge pics - what I can see looks okay.

Edited by Ed (Ont) - 15 Dec 2017 at 10:09am

Look normal for a occasional use machine.

Edited by Reindeer - 15 Dec 2017 at 10:40am

Oh boy tell me about it it’s ran on 2 cylinders no power but it’ll run. Would you be concerned about these or just clean them off every once in a while

Clean them and have a new set available to put in too. Plugs can get fouled for a variety of reasons. Yea they don't run great on just two cylinders!:) Wire brush them good. What brand are they. I like Autolite way better than Champion.
Regards,
 Chris

One thing helped my 170 when I was just using it lightly was to change the thermostat out for a 190 degree one. Made starting a lot better and kept the plugs in better shape. Others may not feel that is the best thing but helped a lot as I used the tractor for snow removal so cold starts were a problem with fouled plugs.

The original thermostat for my 170 was 165 degree as they were expected to work hard, rather than the sedate life they often have now.

Are those AC plugs still as good with the resistor inside

Do you think there better than a Autolite?

dawntreader74 wrote: i wound'it take a autolite plug home for it. they can't keep a push mower running.

Everyone has different opinions..
This is my thoughts about champion plugs....specially in AC's..

When we sold them we loved the AC 45, AC 47, and AC 48.  The AC 48 being the hottest plug.  They worked fine, but that was in the 50's and very early 60's. 
From being on this site I have learned from SteveNJ that the Auto Light is his plug of choice.  Don't remember the number.
From our experience we did not use Champions.  Just remember that was at least 55 years ago.  Things change.
Good Luck!
Bill Long

Like anything else, everyone has there choice of flavors. I never had any luck with Champion Spark Plugs. Doesn't mean someone else had the same issues as I did. They may not have a problem with them. As my pal Bill Long mentioned, I've been an Autolite dealer since 1970, and had very good luck with their plugs. We sell Autolites to our Antique Car and Truck customer's as well as our AC Tractor customer's, and they seem to be the popular plug amongst AC collectors. For Magneto fired Tractors I always suggested to our customer's to use the hotter 295's. For our customer's running Battery Ignitions (Distributor) if the engine was recently rebuilt, I suggest using the 303's which is the cooler plug. For worn engines that may or may not show a little smoke in the exhaust, I suggest to run the 295 plugs. The 295 plug's are the hotter heat range plug which work quite well in worn engines and do not foul as easy.  I've also tried NGK plugs just to experiment with in my own Tractors, and they seem to work well and not foul as easy also. As far as the picture of that plug above, I'm with Reindeer on that one. That plug looks fine to me. Starting and stopping a Tractor often isn't good on a spark  plug no matter who the mfr is. If you don't put the Tractor to work after its fired up, there's a big window there that a plug could possibly foul and misfire.  With the cold weather upon us, this problem can increase two fold where rich mixtures of fuel combined with a worn & low compression cylinder can easily foul a plug.... HTH
Steve@B&B

I bought a set of these NGK Iridium Spark Plugs from Rock Auto (best price). The full part # is XR4IX / 7189. My WC with WD 45 engine has never run better. I had a brand new set of Autolite 295 in there and Number 1 plug would occasionally miss. Number 1 plug had a little color on the porcelain and all the other plugs were clean and like new. I swapped it with # 3 cylinder  and then # 3 cylinder started to miss. So the miss followed the plug. I'll never run a conventional plug in anything I own again. NGK Iridium Plugs are a great product!

I do try to work it when I run the tractor but do you think that the Temp has anything to do with the plugs not cleaning?

Sorry about those huge pictures I didn't realize that until I logged in on my computer I've been posting from my iPhone and they looked fine.