Pony motor spark plug type?

Three things come to mind to help your plugs perform well. Use only copper wires, no radio suppression wires. Magneto fired plugs set at .025 gap. Check your spark color. If not blue, change the condenser.
BTDT
Ed

If any one has the part number and brand that works good with the pony motor i would appreciate it. Thanks Dave.

daves--i have read that the Auto 386 and the NGK A6 are good plugs for the pony.

For myself though I am told I have the newer heads with the plug in the middle of the head and they are a smaller plug dia. My research shows the D-16 is an 18MM plug with a 1/2 inch reach.
I currently have Champion J8C plugs in and they are 14mm with a 3/8 inch reach, but i doubt if they are the correct plug. Would appreciate any one here if they know the correct NGK or Autolite plug for my pony!
My diesel is a D311--7S8119 which i believe is an industrial engine in my 4U-7412

The new NGK number is AB-6 and they work just fine, stock number 2910. The A-6 is obsolete.

daves--i have read that the Auto 386 and the NGK A6 are good plugs for the pony.

For myself though I am told I have the newer heads with the plug in the middle of the head and they are a smaller plug dia. My research shows the D-16 is an 18MM plug with a 1/2 inch reach.
I currently have Champion J8C plugs in and they are 14mm with a 3/8 inch reach, but i doubt if they are the correct plug. Would appreciate any one here if they know the correct NGK or Autolite plug for my pony!
My diesel is a D311--7S8119 which i believe is an industrial engine in my 4U-7412

NGK XR4, stock number 5858.

i have yet to have a champ D-16 give me any problems in any of my 6 cat pony motors 2 cyl john deere's
or farmalls. put a new set in gapped to 25 and fire up, champion plugs have been around a long time and
came in most of the old tractors when they left the factory

[quote="bullcrk,6"]i have yet to have a champ D-16 give me any problems in any of my 6 cat pony motors 2 cyl john deere's
or farmalls. put a new set in gapped to 25 and fire up, champion plugs have been around a long time and
came in most of the old tractors when they left the factory[/quote]

Bullcrk
If you are around this weekend, motor on up to Cayucos, and check out the antique equipment that will be on display in the vacant lot next to the tavern. Look me up, I'll be there with a couple of old engines. Leaving the cat's home this time.
Ed