my xl was out to 320 had a inch and three quarter tuned manderal pipe
38mm mikuni ported and flowed head hot cam
lightened engine and frame
still ran points standard swing arm and cush drive
and was faster than a kitted 420xl
lighter engine with less inertia and more revs
much quicker through and out of corners
i won that many races and titles on this bike
it was lots of fun shouldnt have sold it :'(