It sure is a very tidy looking bike .. just for info ..
I can't recall the numbers now .. but the 500cc had one more cooling fin on the cylider than the 350cc.
Note .. Looks like this one has the 'wrong' carb fitted .. maybe a modern Jap Carb? The original bikes had an Amal Carb and the downdraft air intake bell was enoumous .. we used to carry a soft rubber ball to 'bung up' the intake when the bike was parked up
.
Just for fun .. we also put a teasoon of castor oil (from the Chemists shop) in every tankful of petrol .. fantastic smell from the exhaust .. just like the £$€ Castrol Race Oil
Happy Days
Stay Safe. Polar Bear.