or choke it a little as you ride, if it picks up, you're lean on the top end. culd be larger jets, or just move your clip on the needle.

the only way to really know for sure is to look at your plugs for the range you want. i.e. if you're adjusting low end, run up to 1/4 throttle or so, hold it for a minute or so, then kill the motor and coast to a stop, pull the plugs and look at them. if you're adjusting top end, run it up to 3/4 or more throttle, hold it for a minute or so, then killl adn coast to the ide, have a look.