the KR in the picture was a proddy racer. It had Bob Farnham tuned head and barrells and bored carbs. Against other KR's of the time (mid 90's) it was definately quicker than some of the best tuned bikes around at the time but the forks were knackerd and hopped badly on the brakes. Mid range was excellent with a great top end - guess I must have a good ignition module.
Some years later I was lent a Kitted KR from Stan Stephens. It had explosive top end power, but little mid range and didn't suit my style.
Crashed it at brands in the october powerbike meeting after getting up to 4th, punted at the hairpin, went mad, too fast and gracefully spat off at the hairpin 5 laps later! - (Sorry Stan

).
The RGV was tuned by Steve Kemp (when working with Bob Farnham), basically a grenade in an aluminium chassis!
TZ was built by Graham File, it took some fiddling to get the best out of it, but when set up good - wow, this thing was quick.
Also had a proddy TZR250. Massive fat mid range but hit a brick wall at 10.5k. Good enough to keep up with 70hp RGV's with a good exit and slipsteaming. Got 2nd and 3rd places at snetterton and pembrey in the supersport races - (a few red faces there). just cant fault the TZR - excellent bike.