The 87 carb can be modified to work as good as the 88+. As for carb selection, bored stock zilla carb for trails/racing/duner, mikuni vm44 for real high power duner/hillshooter/drag and lectron for hill shooting and drags only. I'm am not a fan of lectrons, they never seem to run consistantly across the rpm range. Mostly from a lack of multiple circuits to tune. It is the only carb availible over 44mm I believe.