Mid range torque is what you want to improve. That's where the automatics live on the street. Top end power doesn't get used as much. More torque comes from displacement, compression, air flow, and the elements matched for your needs. Factory clutch cams will help some; an adjustable cam gear will allow you to advance the cam for a lower rpm powerband. The cheap 836 pistons have 1 point + less compression than the more expensive ones do. A good porting job deserves better than stocker carbs. 29 mm smoothbores gives you a crisp throttle, but can't be whacked open without a bog. They also aren't very cheap to find. 32 mm CV carbs work very well, as Sam can attest. You can get Seca 750 CV carbs or 700/750 Nighthawk CV carbs at a reasonable price.(Ebay, bike junkyards, Craigslists, etc) They mount with stock K head clutch manifolds. A little hand porting will help reuse the stock head; there's a topic with pictures covering that on here. A fresh valve job is always good to do. If the bike has a lot of miles, improved horsepower will wear out what's left of the clutch packs quickly. Bearing clearances should be checked if you're going to replace the clutch pack(s) They may need replacing on a high mileage/neglected maintenance motor. Cam chains also don't last forever; they wear out over time.
If you need a new exhaust system, a 4 into 2 into 1 pipe improves the midrange. Longer primary tubes will also help improve your midrange. Just some suggestions for your consideration.
