OK, this looks like the final update on the M62 revival!!
We installed a Zenith carb, it made the 6602 start better and run somewhat better, but we have had an issue with dropping random cylinders. When the plug is removed, it is fouled. Clean it, re install and it runs fine for a bit and then another cylinder drops out.
I have never been able to properly adjust the carb either because when trying to, it drops a cylinder. Very frustrating!
We decided to seek out a new set of 2245 plugs. Welp, those things are between 45 and 80 bucks, EACH, if you can find them. I tried some aircraft connections that I found when working on the carb in the Priest, they show the cooler 2243, but seems nobody has any anywhere.
In using some google-fu, I came across an adapter that lets you use a civi plug and retain the military wire. Not the metal ones that pop over the hex on the plug, but a device that slides over just the porcelain of the plug and is secured to the threaded tip with a piece of brass that looks like a main jet from a Mikuni carburetor on a motorcycle.
I was intrigued! I clicked on the link and found that it is made by Brent Mullins out of Tx. Brent Mullins Jeep Parts. I called him and he sent 6 out to us. We picked up some NGK BR6S plugs.
Today, I removed the mixed-matched set of plugs from the 6602, installed the new plugs and the adapters. Took a bit to fire it, I ran it out go juice the last time we ran it, but after it got running and had built some heat, I was able to adjust the carb and the idle. The beast was backed out of the shop and it made some laps around the compound! Great acceleration/throttle response, brakes work, it shifts good!
I then backed it into its spot on the display line. Normally, if I run it out of fuel, it took 2 mins to run out. This time, it ran easily 5 minutes before it sputtered and died. I do think the plugs made a BIG difference!
When I went back to the shop to get tools for fuel and battery removal, it looked neked without that big hunk in my bay!
Under $20 per plug for the conversion and a MUCH better plug!



Here is a link to the adapters,
Adaptor kit to convert over the counter spark plug to replace the waterproof Auto lite 2243 and 2245 spark plugs used in many 1950's to 1980's military vehicles. Special manufactured plastic sleeve that goes over the NGK BR6S spark plug and adaptor screw for attaching.
www.ebay.com
A link to the pig running on the NGK plugs,