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I'm not sure if this has any relevance to the EXC KTMs but from the Motocross Action site:

KTM will install a six-speed tranny in the 2001 420SX four-stroke. This years 400 had the same four-speed tranny as the 520SX. The smaller 400SX has trouble bridging the gaps that the 520 glosses over--so for next year it will be a six-speed.

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