Yes they can,......... but the nsr crank is not completly pressed together. The big end is only pressed on one side the other side is part of the the center crank throw. Plus Honda doesn't sell any parts for the crank. I've been talking with Glen from Falicon and he says no go. I said what about a billet crank( a billet tripple crank for a sled is $2500 ) he told me $15000-$20000. I said thanks but no thanks. I was thinking 4.5mm to square the bore back out ( 59mm bore 300 ) to about 320cc.
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike