856 part for plug

[Jason Miller 24]

Question,

My 856 stopped running the wire on top of the spark plug is loose won’t stay on should snap or click on top of the spark plug buts original and wore out. Help where can I get one and what kind?

Jason

[WHX?? 54,865]

Auto parts stores can make you one. Otherwise @squonk has them. 

[ri702bill 11,232]

I use the coil wire from a 1960's to 70's Ford Econoline 6 cylinder. Right length, fits well...

Edited February 17 by ri702bill

[Achto 30,948]

7 hours ago, ri702bill said:

I use the coil wire from a 1960's to 70's Ford Econoline 6 cylinder.

 

And they still run with Ford parts on them ???? 

[ri702bill 11,232]

2 minutes ago, Achto said:

 

And they still run with Ford parts on them ???? 

Rather well actually. Used a NAPA part, so no Ford recall.....

[adsm08 4,186]

6 hours ago, Achto said:

 

And they still run with Ford parts on them ???? 

 

Mine runs better with the Ford part than with the one it replaced.

[Easton Rich 968]

Im using a coil wire from a late 60's early 70's small block chevy

[Achto 30,948]

Given the fact that I have a handful of tractors, I buy a set of wires from TSC and cut them to length. One kit covers 7 single cylinder Kohlers.

 

https://www.tractorsupply.com/tsc/product/tisco-spark-plug-wire-set-sws260

[Retired Wrencher 6,438]

I believe the original wires were 7 mm. I bought some recently. They were an off brand on eBay. I have them on two different tractors. They seem to be working well.

[Retired Wrencher 6,438]

10 hours ago, Achto said:

Given the fact that I have a handful of tractors, I buy a set of wires from TSC and cut them to length. One kit covers 7 single cylinder Kohlers.

 

https://www.tractorsupply.com/tsc/product/tisco-spark-plug-wire-set-sws260

Where those 7mm wire Achto?

[Achto 30,948]

30 minutes ago, Retired Wrencher said:

Where those 7mm wire Achto?

 

Not sure, never measured the outside casing. They are copper core wires not graphite core.

[Retired Wrencher 6,438]

1 hour ago, Achto said:

 

Not sure, never measured the outside casing. They are copper core wires not graphite core.

Ok thanks. I will have to run down and check them out at T/supply. 

[Handy Don 15,881]

4 hours ago, Achto said:

copper core wires not graphite core.

Ah, I wonder if running copper causes any interesting electrical interference to any modern electronics. I know it’ll drive an AM radio to static.  

[pfrederi 19,864]

If some one is driving down my dirt road in some fancy smanshy car with lots of electronics and my copper spark plug wires interfere,,,TDB

[Retired Wrencher 6,438]

On 2/17/2026 at 4:50 AM, ri702bill said:

I use the coil wire from a 1960's to 70's Ford Econoline 6 cylinder. Right length, fits well...

I have to remember that Bill. Good info there.

[squonk 45,459]

On 2/18/2026 at 5:50 AM, Retired Wrencher said:

Where those 7mm wire Achto?

Most universal tractor wire sets are 7MM

[squonk 45,459]

I buy solid core Belden High Temp wire in bulk along with high temp silicone rubber plug boots. Belden terminals and coil nipples

[sqrlgtr 2,143]

2 hours ago, squonk said:

I buy solid core Belden High Temp wire in bulk along with high temp silicone rubber plug boots. Belden terminals and coil nipples

Same here but maybe different name brand. I got tired of not having the right length wires and started making my own. Little upfront investment but crimp tool and supplies have already paid for themselves. 

[John2189 561]

I just squeeze the terminal a bit until it is tight enough to stay on.