Need new chain and sprocket info

[JOE]

my buddy has a 1997 honda F3 he needs a front and rear sprocket and a chain to match , he would like drop a tooth or add teeth , he is looking for a lil more TQ but still be able to cruise at 80 any info would be appreicated on tooth configuration and chain type. the bike will be kept outside if that matters for the chain , i also need a good place to order it from , thanks guys