Originally Posted by
HillRider
..the Sugino crank has it's chainrings spaced for 7-speed chains. A 9-speed chain is significantly narrower and may want to fall between the chainrings .
I've been running 9-spd on an LX crank that came from a 7-spd bike for years with a total sum of zero problem like that. Of course it's possible that Sugino 7-spd would have other tolerances than Shimano 7-spd, but I wouldn't worry about that.