Hi I have just successfully completed a successful transformation of my old road legal S, from a torquey but slow old bike to one that hauls. It has been fitted with a genuine secondhand DRZ E FCR carb, removed the overun enrichener and linked the carb fittings with a tube, 55 pilot, NCY-T KXF 450 F needle, 2 turns fuel screw, 168 main jet, new valves, cleaned up combustion chamber and ports, concentrating on the valve pockets and the bowls behind the seats, 13.5 to 1 wossnier piston with the s model base gasket to drop compression for pump gas, E model exhaust B cams on both exhaust and inlet (244 dur and 9.3mm lift on both), had to degree the inlet cam and fit the proper inlet sprocket with the correct timing marks, decomp removed on both cams, also had to grind of a bit off the shaft where the decomp was to allow fitment to the inlet cam bore in the head,ported E model header with a 2005 rmz 450 oem muffler and fabricated link pipe (made out of the pipe off the original muffler), std CDI unit, foam twin air filter with massively opened up airbox, NZ 95 pump gas, 190 cca battery, I modified original screw camchain tensioner into a fixed manual tensioner, all locktite mods done, standard s gearing. It runs way smoother, better fuel economy, starts instantly, idles happily round town, great on the dirt, massive fun on the road, comes up in the first 2 gears on the gas and third with a tug on the bars, and Im 115 kg (240+ pounds), easily does 145kmh, no effort has been put into taking weight off the bike at all. Next job is to fit the CBR 250 17 inch rims for road use, the gold valve/respring the front and rear ends of the bike, and I need to lose some weight. Thanks heaps to all the DRZ 400 posts on TT, been a great source of info, the B cam mod is unreal and has transformed the bike, they are close to the old stage 2 hotcams, just 10 thou less lift, its smoother and carburates almost perfectly, will get a dyno print in the next couple of weeks. Thanks for all your info.