The flywheel is the on off my spare engine as i bought 2 cars and currently running the 90 (h) engine and box, and its taken me 3 months to sort the fly out, and had to repair and paint his m5 bumpers as a deal, if you turn it over you can see where he has cleaned it up but not drasticly and removed loads off the back, any more and he recommends balancing the crank and the rest, i will ask if he fancies doing more, but is ultra busy he does all the engineering for stratstones (ferrari, porsche, aston martin, and more) and makes a bomb, i would estimate over a £100, but did get a quote from an engineering company round the corner and he said £80 so try a guy near you, any good engineer could sort, sounds like you cant wait to rev your R1 tom RRINGGG!! RRINGGG!! Ant!