Back to Spark Plugs (8N)

[Jim in Western MI]

I know there is a great deal of info on this topic, but the current search helper doesn't get me much. Perhaps someone can catch me up! Just removed from both my frontmount 8N's the NGK 3112's I installed about ten years ago. Just beginning to hear some misses. One 8N has EI, the other has points. Both start fine, the EI 8N seems to have more power and uses gasoline more frugally, but there are a lot of variables that could affect that..., including my imagination. I switched to NGK's last time because the Champion H-10's corroded on the external surfaces, and I had read then that Champions had deteriorated in quality. I ordered 8 from YT, and got RH18Y's. They came in a big box with a left side lift fork, and all 5 of the 8 were out loose from their little boxes (no 4 or 8 plug box) and had obviously bounched around a lot. All had to be reset, to .025, some with the grounded electrode bent almost to the center electrode. Even the upper lift fork was misaligned and had to be engineered. Shipping must have been rough or handling/packing not so good. I don't know if these are the current "best" plugs, but I'd like your experience with this last generation of plugs. Can I still get the NGK's?

 

[Jim.ME]

NGK's are still available. I have had good luck with NGKs, I would stay with them.

 

[HarryVanderpool]

Read through this:

H

Post in thread 'best spark plug for an 8N'

Jan 30, 2026

Spark plugs have a very simple task. They receive a high energy pulse and return it through a gap to complete the circuit.
Brand makes absolutely zero difference.
Gap them, install them and run them.
Possibility of failure is equivalent to being struck by lightning.
Plug issues are usually an indicator of other problems in the system.
Unless you are running your N HARD day after day, every day, plugs will last for a decade or more.
And even then, clean, file, and regap and you're good for years.
I read the chainsaw forums and folks rant about changing plugs twice annually!!???
Our 60cc...

• HarryVanderpool

• 

 

[Jim L WA]

Read through this:

H

Post in thread 'best spark plug for an 8N'

Jan 30, 2026

Spark plugs have a very simple task. They receive a high energy pulse and return it through a gap to complete the circuit.
Brand makes absolutely zero difference.
Gap them, install them and run them.
Possibility of failure is equivalent to being struck by lightning.
Plug issues are usually an indicator of other problems in the system.
Unless you are running your N HARD day after day, every day, plugs will last for a decade or more.
And even then, clean, file, and regap and you're good for years.
I read the chainsaw forums and folks rant about changing plugs twice annually!!???
Our 60cc...

• HarryVanderpool

• 

I couldn't agree more Harry. I like to say, 'There's no moving parts in a spark plug'.