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94 RM 250 Spark plug?

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hi i just picked up a 94 rm 250 and i was wondering what plug i should run in it.  The guys before me was running a B8ES and i dont think thats the right one but im not sure. the bike doest seem to have a lot of low end balls but screams when you get the rpms up.

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I run the NGK R4118S-8, but I've heard of people using a different plug to get more power and easier starting.  Maybe someone that raced one back in the day can respond with another suggestion.

 

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The B8ES is a good choice. Maybe adjusting the power valve will give you better low end. Try a quarter turn counter-clockwise.

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