I am going to buy a spare one and have it lightened

 

97 07 KLX300 KLX 300 KLX250 Flywheel Magneto Fly Wheel | eBay

 

I don't know that the 300 flywheel is the same... Isn't that a kick start bike aka no gear that goes on the back of the flywheel?

 

i believe they are the same since we can add kick starts to ours also

 

Different part #'s

07 klx 250 #21007-1273
07 klx 300 #21007-1314

im looking also

 

kickstarter engages at the clutch.
The flywheel for the e-start bikes has a gear , as Richard mentions, on the back of he flywheel that the starter gear-train engages. I doubt the 300 flywheel has the gear on the back of it. I've been wrong before though.
Dan

 

There are plenty of 300 flywheels on ebay, but that doesn't seem to be what I can use.

There are probably other e-start Kaws that may have a flywheel that'd fit, but unless someone has first hand knowledge it'd be an expensive shot in the dark to just guess