Okay Stev-o, short version on my CB450 build.
The CB450 motor was stripped down, cleaned, barrels bored out and re-sleeved, then the new sleeves were bored out to take 74mm pistons., making it 497cc. Head was ported and polished and fitted with race valves and megacycle race cams. Capellini oil pump fitted and external oil lines delivering oil into the cams. CR33 carbs fitted. Starter motor removed and blanked off.
The frame was modified with the centre brace removed and extra bracing put in to match the Hansen bikes of the 60's. Suzuki GT750 4LS brake drum into an 18" rim on the front, CB450 rear drum modified from rod actuated to cable actuated brake.
Honda CR450 replica tank made in India because UK suppliers would not answer my emails. Davis motorsport seat and rear sets. I made the brackets for the Davis motorsport fibreglass front fender.
The silver bottle is the oil catch can, with both cam cover breather tubes plumbed into it, required on the track.
Progressive springs and emulators in the CB500T front forks, YSS rear shocks (locally made and good quality).
I used an aluminium tank, left the kick start spindle in and made up a side stand that bolts on and off, so that I can convert this bike to road use later on if I want by adding headlamp, brake/tail light, speedo and handlebar switches. If I do this it will be made up as a 'plug and play' system that can come on and off the bike as required.
Now it is finished I am ready to do another Honda SOHC4, I have sourced a CB750F1 and hope to do a careful resto-mod as has been shown successfully here by Tweakin and others in the past.