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What plug do you guys recommend for a 1997 KX250? And is plug selection very important? I am running a platinum plug in my bike and it just does not perform.
 

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NGK B8ES is my standard, it's what alot of people use. but consult the service manual for the proper heat range (B8ES, B9ES etc. the higher the # the colder the plug.)

don't deviate from the factory heat range unless i HAS to be done
 

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I reccoment the ngk b8es. 5he b7es could burn a hole in the top of your piston over time they usually don't foul because they are a hotter plug. If you have it jetted right and don't load the bike up and don't use the engine compression to slow down you shouldn't foul plugs I sually get quite a few hours in without fouling plugs my 01 yz250 I've had for 2 years hasn't had a plug yet
 

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right from the kawasaki web site.
NGK B8EVX
kawasaki.com
go under owner info
parts diagrams
click continue on motorcyle
then put in yr size ect.

this will give you a spec sheet for the whole bike
hope this helps
Kawie
 

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wellll... it depends on how hard you ride, a br8es will work good and you will not foul it if your woods riding and stuff, but if you ride in the open and ride pretty hard, run a br9es. because the lower the number the hottter running the plug will be and if your running too hot of a plug too hard you can burn a hole in your piston. but my dad had a kx250 and he ran br9es. and that's what i run in my kx85 and kx125. hope it helps
 
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