Thanks Terry - the pistons are wiseco 62mm straight from Mark McGrew. Funny really I've tried to get another set from him and he just never ever replies. Wonder what's going on there, maybe I'd better go to Dynoman! Not sure what compression this will give me but I've got 12.5:1 in the back of my mind for some reason?
Anyway, the crank work was done by Pete Rhodes here in the UK to fit the rotor. Apparently it's an easy enough mod, the hardest part is setting the machines up with a dirty great crank in them to trim down!
Next build pic attached, with the barrels on, the front camchain blade can go in. Can't use the original CB750 blade as it's also got the central ridge for a roller chain so this has to be altered as well. The one I settled on was a CB250N blade with about 1.5" trimmed off the bottom to fit the 750 cases. Of course there was a lesson in this little episode too - I bought the first blade and chopped it and chewed it up and made it fit but it was left in a not too nice state after all the experimenting to fit. No matter I thought, it wasn't expensive so I'll order another one and do the final mods I'd arrived at with the original blade. DOH!!! I had just butchered the last blade stocked by David Silver and he was showing the part as obsolete worldwide!!
Thankfully a very small local Honda dealer had one in old stock...phew! Another close call averted....