Torque orientated is the way to go, my R1100GS has been well modified, cams, pistons, one-off ignition system, crankcase ventilation, one-off exhaust system, modified camchain guides, vernier cam wheels, etc, etc.
The last trackday I attended, the acceleration was identical to the R1200GS, but I've become fed-up of having to use the revs all the time.
The acceleration is excellent, but for the real world, lower rpm drive is more important.
Early last year I modified a R1150GS, I fitted 36mm inlet valves from the R1200GS, tidied up the inlet valve seat area, fitted a Power Commander, modified standard silencer and Y-piece and 'S' camshafts.
I left the compression ratio as standard and didn't optimise the squish. The standard 34mm valve seats don't need changing for the larger inlet valves.
Comparing this bike to mine, there was very little difference, mine pulled a bit stronger at higher rpm, but the midrange of the 1150 was very good.
This is what I would start with, later you could fit the RT or RS pistons for more compression and bigger 31mm exhaust valves, don't forget that fitting the larger inlet valves will introduce more mixture, hence raising the actual rather than calculated compression ratio anyway.
The standard inlet ports are too big, the larger inlet valves reduce this problem, the improved flow, especially at lower gas speed, will give you better mid-range performance.
Everything you need to improve the performance is available from other models, most parts can be sourced from
Motorworks, plus you can do the improvements in stages.
Food for thought!
