Originally Posted by moot
the cranks and carbies are different too.
Looks like you're right. I checked on the parts listing, and the part number for the crank between the 3 port and 5 port is different.
3 Port:
http://www.gpmd.com/cgi-bin/wgpprt100p?&I=OSMG1997
Crank = Stock number OSMG4487
5 Port:
http://www.gpmd.com/cgi-bin/wgpprt100p?&I=OSMG1998
Crank = Stock number OSMG4488