K7's didnt sacrifice any power in the low/midrange to get extra top end. Suzuki optimised the K5 engine even further through more compression, more RPM through lighter pistons & stronger rods, far better exhaust porting (one of the main reasons for better top end), bigger throttle bodies, finer injectors, faster ECU, stronger ignition spark, slightly hotter cams & bigger crankcase ventilation holes. All this added about 8hp thru the midrange to the top when you junk the restrictive CAT that the K5 doesnt have standard.
The reason the bike is down on low/midrange was because it was tuned out electronically through the STV's (secondary throttle valves) controlled by the ECU so the bike didnt open the gas as fast as you asked it to. Reason being was to dull the throttle response (many considered it too sharp for racing or noobs) & add finer control at part throttle.
All the 'lost' power & torque can be restored by getting the ECU flashed - the K7 can get its balls back easy peasy now
& be all the bike the K5 was & more like it should have been.
Originally Posted by DasAuto
I'm most curious which has the best top end. I'm not a drag/wheelie guy. I was told k7's sacrificed low and mid range power for even more top end. Suzukis were always the top end bikes of all the brands anyways, but especially the K7's