What is wrong with my plugs?

[john8504]

Pic of the new stator

• This reply was modified 5 years ago by Mumbles.

[john8504]

Checked spark on my coils. I backed it out 3/4” and I still have great spark. Bottom cylinder not burning off correctly. I would think that if the halves of the case were worn then both cylinders would be bad.

[The Boat House]

[john8504]

Found my problem. It was the type of plug. Switched to some Ngk racing plugs and runs like a champ!!

• This reply was modified 5 years ago by Mumbles.

[Mumbles]

john8504 wrote:

Switched to some Ngk racing plugs and runs like a champ!!

What did I tell you! 👍

I’m not sure what you mean by ‘racing’ plugs but I feel off the shelf NGK plugs are superior to anything currently on the market. Others may think different but I’m convinced.

[john8504]

Yeah good call on that. I had several people convinced it was as in the electrical. Funny thing is that the other plug would jump 3/4 inch on spark testet

[billw]

Well, it WAS an electrical issue….just one that was so obvious that I forgot about it!!! Good call! A true “duh” moment, on my part! However, I do have to say that I have seen plenty of dead holes on Yamahas, caused by NGKs that were less than a year old. I am not arguing against them; but they, too, have their moments.

Long live American manufacturing!

[Mumbles]

When purchasing NGK’s, they have to come from a reliable source to be genuine. Like most everything else, there are poor quality fakes out there which look convincing and are being sold online at places such s Epay so it is buyer beware. Doing a Google search for fake plugs will help to identify the phonies.

• This reply was modified 5 years ago by Mumbles.

[billw]

I hope ours aren’t fakes. We buy them from a local wholesaler by the hundreds, probably thousands, come to think of it.

Long live American manufacturing!

[john8504]

I got mine from the auto parts store. I’m fairly sure mine are fine. I run a auto repair shop, I deal with ngk plugs on a daily basis.

[Author]

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