took the sled for a 105 mile rip this past weekend. wow sweet!!!! fast and smooth, other than an iffy midrange and not getting above 7640 rpms. whats the engagement for an 04 f7 sp carb for the valves? it pulls hard to mid to upper nineties still has more but i run out of room. im taking off the 020 belt for the 031 in hopes that gets me to 7840 but if not, i think it could be valves. no codes or check engine lights just something i noticed.