And so replying to e-mails & other bookwork is delayed for another half hour.
Saw one being pushed over the line, was it by chance powered by a 465 motor 
It occurred to me while watching them that speedway bikes haven't evolved much over the years.
MX / Enduro bikes, Road bikes, Trail bikes and even Trials bikes have all evolved to be quite different bikes to what they were thirty years ago, but Speedway bikes appear to be essentially the same.
No doubt motors have improved and their would probably be subtle differences in geometry as well.
This isn't a criticism, it just seems they got the formula right from the beginning.
they have evolved Geoff, but its been an evolution reather than a revolution.
its a tightly controlled sport and always has been. speedway control council was the govening body before affilaition to MA in late 80's (i think)
the basic machine is rigid rear, diamond shaped frame with no gearbox just a primary chain from crank mounted sprocket to clutch input and then secondary chain from clutch output shaft to rear wheel, gearing for differing tracks is altered by crank sprocket and rear wheel sprockets. no brakes 500cc foustroke methanol fuel.
up to early 70's 2 valve engines, oil was total loss dumping on track. points ignition total loss battery.
mid 70's they changed to 4 Valves, interspan CDI ignitions fired by points. (some had electronic no points)
late 80's early 90's engines went to laydown style from upright. with recirculation oil systems (no more dumping on the track)
mid 90's leading link forks were the go from spring type conventional forks (no damping or oil, grease for lubrication on brass bushes)
late 90's dirt deflectors were fitted behind rear wheel, full body work becomes fashionable.
but yes you are right they do not look that much different from the early models.
