Ekman,
There is another difference between the enduro and motocross engine.
On the right (clutch) side of enduro engine's crankshaft, there is an 8 oz "balancing weight" (where the counterbalancer drive gear rode in the early model Gassers).
In the same place on the MC 250, there is a very lightweight aluminum spacer, instead; which further reduces flywheel inertia/weight.
Good Riding to You!
Jim
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