Na I haven't calculated belt speed, should be ok as I'm only turning it twice as fast as factory Honda cambelt...Plenty other modified parts to worry about first...
Jeff, Gates make a carbon fibre belt that would be ideal in that drive application. I have used them on forestry equipment and have worked well. The downside is they have to be perfectly alined which shouldn't be a problem for a genius Gates Polychain Belt.
The belt I had was rated to 5000nm torque, cost $1000
Finished off the exhaust, managed to tuck the std muffler up under transom with a little silicone water trap on end. Just gunna wrap copper pipe around the header to pre heat raw water before entering cylinder. Not sure how many wraps I'll need? Will just heat wrap the whole exhaust system (rangi I know)