The few times i've tried it i have to confess i'm not noticing a massive difference between cap off and cap on (i've been off the bike for a bit with shoulder problems and coming back onto it i'm finding it hard to work out).
regardless i'm going to fit a new breather to the tank (much like the old cafe racers) and then start a process of trying to improve whatever it is i've done to it.
so far things to check
-is it running rich?
-clean floats?
anything else?
