The story of the belt drive is that when the bike was first built (20+ years ago), they were no belt drive kits for 45s so a standard tapered machinery belt drive front pulley was used, with a tapered spacer to go between the big female taper and the small 45 crankshaft sprocket shaft taper, a poor engineering solution but it did last for a few thousand miles.... It flew to bits as I was riding it recently so I got an original 45 sprocket and turned it back on the lathe to get the right spacing to keep the belt in line, with a protruding register in the middle, turned a corresponding female register in the pulley and bolted the two together. Seems to work fine. The clutch end is something I bought at a jumble somewhere I think (was a long time ago) and uses long round allen-headed screws in the drum, which has 68 HTD teeth on the outside, as the locating points for the outer edges of the plates and a Triumph boss and hub that fit onto the Triumph gearbox. I think the springs and outer plate are Triumph but a Norton three spring is reckoned to be better by some 'experts'. It never slips or drags though! The outer of the drum has 68 teeth and the front pulley has 36, with 1:1 top gear, and a 20 tooth gearbox sprocket and 43 tooth on the rear with a 4.50 X 16 tyre, this gives 78.48 mph at 4500 rpm. I am going up a tooth on the gearbox sprocket as it will pull it. I generally cruise at 60-70 now (4000 rpm is 62.46mph). The belt is a Contitech HTD 1040 8M (8mm pitch) (with the half round teeth NOT the square or trapezoidal teeth, the HTD profile is much better). You can buy pulleys for about tenner from www.accupulleys.co.uk or other places on the web. You can buy a 64 tooth or 72 tooth pulley from them for about £50 and turn it out and shrink it onto your existing clutch drum. I use 30 mm wide belt which seems plenty strong enough for what is a mildly stroked and tuned 45 motor and it is often blathered in oil and does not seem to mind. They are available in 20, 30, 50 and 85 mm width. Most big twin people seem to think they need very wide belts but they just get in the way of your feet as far as I am concerned! Ridden properly, the 45 has very nice smooth power delivery and is not hard on the driveline. The mnistake I think a lot of people make is that they think because it is a sidevalve, it should be 'ligged' at low revs. Actually, I find that the engine design works best at 3 - 5,000 rpm. Have a look at belts at: http://www.contitech.de/pages/produkte/ ... HTD_en.pdf
Give me an email at firstname.lastname@example.org if I can help at all.
Oh, the Indian CHief 1940 back wheel has worn out now and I have a Harley wheel with disc brake but need a 3/4 inch axle/spindle to get back on the road, if you have have lying about?!