2006 RM 125 Spark Plug Heat Level #7 vs #8

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1/29/2021 9:28 PM

Hi all,

My dealer sold me the R6918B-7 spark plug and the manual calls for a R6918B-8 plug. Hence, the plug the dealer sold me will run hotter. What damage or danger am I risking by using this spark plug? I don't want to melt the spark plug and do damage to the engine. My gut tells me to only use #8 rated plugs. However, if I use race fuel (I currently do), which runs cooler, or run a leaner mix (more oil; run 32:1 instead of 40:1) will that counter the extra heat? Or just be safe and return it for a #8 plug?

Thoughts?

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1/30/2021 7:20 AM

Those suzukis are sensitive to plug type, and that design is to stop the ground strap falling off and ruining the engine.

With race gas and rhe special 7 plug, you might be ok....

But $30 for rhe right plug is cheaper than the repairs

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1/30/2021 7:51 AM

I would only run the 8

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1/30/2021 9:57 PM

FYI, a leaner mix runs hotter. You are correct that more oil = leaner fuel/air mixture, however.
I'd run the #8 plug.

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Braaapin' aint easy.

2/1/2021 11:25 AM


What type of riding, and what’s your skill level?
Your answer could indicate a 7, 8, or 9
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2/1/2021 10:48 PM

Desert riding. Fairly fast A rider. I stay in the upper rpms in the 125.

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2/2/2021 9:08 AM

Definitely go with the colder plug. (#8.)

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Braaapin' aint easy.

2/3/2021 6:02 PM

Subotai wrote:

Desert riding. Fairly fast A rider. I stay in the upper rpms in the 125.

That 7 would surely melt a hole in your piston!
They do make a 9, if anyone would run a 9 you absolutely qualify.

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