At top end or near top end the clutch on a 78 spitfire seems to "go away"and bogs out dropping top end speed by 5 to 10 mph. sled is making plenty of rpms and runs fine. We think it is time to rebuild the drive and driven clutches. problem is we are not sure whcich one is giving up at top end. Also looking for info on spring types/colors for both clutches.
Thanks
