Hi, Dandy Dave.
Cain't say I blame you. I think the worst I ever saw was a D7C 17A series. IF you covered the pony with a heavy sack overnight, you MIGHT get it started in about 1/2 to 3/4 of an hour.

Forget the sack and you could be there for 1 1/2 hours.

I also worked a 2U D8 that had the WEIRDEST pony motor I ever came across - it would NOT run on two cylinders unless the TOP #2 plug was EARTHED from the INPUT wire to some part of the body of the motor. NOBODY ever figgered out why and it was traded on a new D7F that way.

Just my 0.02.

The plug would not ground in the head? That is weird. 

Heli coil for the plug maybe and wouldn't let the plug ground.🤷‍♂️

Hi, Dandy Dave and Fat Dan.
The plug had been out and back in numerous times, even replaced.

What baffled everybody, even the local Cat dealer boys, was that the placement of that wire from the top of the plug and held down by the same 'nut' that held the plug lead to the plug and going to some point on the body of the motor SHOULD have STOPPED that plug from getting enough spark but it would not fire on that cylinder WITHOUT that wire.

Without that wire, you could get it to run on both cylinders by shorting from the top of the plug to the body of the motor with a screwdriver or similar - runs on two. Take the screwdriver away and it went right back to running on one. They could not solve the problem so they installed the wire as a 'permanent' short and it worked like a charm - went to its trade-in like that.

Just my 0.02.

🤔 humm yup, above my pay grade. First thought was bad ground which makes electronics do crazy stuff.

Back on subject. I need a water pump pulley for the old D6-9U. Threads are stripped on this one. Part numbers are 1L648 Hub. and 4F-6046 Rim. Anyone have anything?

Nice going Dave--what state and town did you find that D6??

Hub=https://www.machinerytrader.com/parts/search?PartNumber=1l0648&SearchType=Start&PartsSource=Machinery

In Milford, CT. dpendzic, Think you might have those parts? Your serial number will tell us maybe if the whole unit has not been changed at some point. There is a lot of serial breaks in the parts book.

Photos of the water pump pulley's removed. I got it apart yesterday. They are good and beat. I found some good used ones. They're in the mail.