the regular and the pbs are the base models
the pro and the pbs paul coleman are the hopped up versions
pbs stands for pivot ball suspension
i might be mistaken but the hyper 7 pro may include both suspension set-ups
call nitrohouse's info line they can probably tell you things that nobody else even knows though
aaron i will definetly look into that thank you and sorry about my offensive post last night i was just excited about selling stuff so quickly especially an item i wasnt sure would sell at all
and 280 is on the hot side i would bet the bottom end is way too lean and the top is probably too rich i was told the bottom end needle has a greater effect on temp than the high end does most engines run best between 240-260F
it makes sense too cause you said it had good acceleration but poor top speed