...because Honda never exported the bike ooutof Japan. The NSR was a Japan only Model. Japan DMW probably did not 17 di requirment at the time so there was no need.
Back in the old days, at least in California, the engine block number was the VIN. You should see all the problems that causes now since very few older cars have the origional motor.
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james
Its not how fast you go...Its how you go fast.
MC21 Rothmans
RS250
RC31
CRF250X
748R
Porsche (many)
http://members.rennlist.com/j911brick/rennlist3_002.htm