01 Blast "primary guide"

[Bosgarage57]

Thinking about picking up an 01 blast. Seller says that the "primary guide" needs to be replaced. Any suggestions and can I still find parts for it? Hes asking $500 for the bike so Im really thinking about pulling the trigger on it. Im thinking its the tensioner and guide rod and all that.

Also, can the blast handle 2 up riding? I'd assume so, may be a little cramped, but my 250 ninja did ok. Just looking for a bike to putt around on and possibly teach my gf how to ride.