Maintenance & Technical > KX450F / KX250F

KX 250 F Flywheel

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steelhorse:
Hello, Maybe somebody can answer a couple of questions for me.
I want a heavier flywheel for my 2008 KX 250F for better trail performance (we all know the benefits).
When looking at the Kaw "parts" manual (generator section) I see three flywheels listed, stock(noted I=4.1), a lighter one(I=3.6) and heavier one(I=4.8).
  When I contacted my dealer service department they told me that the (I=) designation was for Kilograms. When doing the math in seeing how much weight I'd add by installing the heavier one the answer was an increase of 24.7oz or 1 1/2 pounds.
  I question the (I=) value my dealer told me because Stealey Off Road offers two heavier than stock flywheels with the heaviest being 6oz due to size constraints in the side cover.
  Anybody have usuable information to assist? Can anyone make a recommendation from their experience?

Thank you!
steelhorse   

Friar-Tuck:
 Steel,
  I would be very surprised to find  "I" in any terms for weight, I've been surfing around trying to find that and have no luck.   Maybe someone else knows.
     You're definitly on the right track,
         Tuck \o/

snoopjonnyjon:
I is the mass moment of interia.

The way a flywheel works, the weight/mass really isn't the sole determining factor. You also have to consider the distribution of where the weight is located from the rotating axis. The Kawasaki flywheel would probably add the weight more towards the outer circumference (since that is where it is of most benefit if you are engineering an entirely new flywheel), while the Steahly adds weight to the outer face, which will require more weight to accomplish the same thing.

steelhorse:
Thanks for the replys. I see I made an error in my post having put a smiley face instead of the important I=4.8 for the heavier flywheel.

Friar-Tuck, Thanks for the encouragement!

Snoopjonnyjon, As for you description I believe you entirely correct. The Kaw parts manual illustration shows exactly what you describe. That is, a peripheral collar ring on the flywheel located toward the back of the flywheel.   

My question now becomes, does anybody have riding experience with the heavier optional Kawasaki specific flywheel? Cost by the way is $202us.(through Cheap Cycle Parts on the web)

Thanks all!
steelhorse 

blaisintreez:
i have a rm250 port and polished on race fuel with 13oz weight, works well for moto i would not want a bigger one , hope that helps

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