dont know that much about it, i think it's a 650 crank in 550 cases and frame. maybe the head is a 650's too
misnao was last round and season is over but with moving house in the middle of summer and other personal issues I did only 3 regularity races out of 6 at the end,( 2 of them rained out!) so odd year really.... hope next year i will have more time to do them all.