Nice Pic, Goof's RM500 was certainly a trick looking bike.
Wandering if anyone knows what sidecovers he used back then? As the 500 alway's had oval covers, maybe PE175Z (82) were used?
After recently watching the 1983 MR. Motocross video, Goofs bike definately looked like he had a horsepower advantage over the rest at the last round in Broadford.
I heard a while back that this bike was bored, to well over 500cc ?
But I think it was Goof that was fast, and not the bike.