All 650 airboxes are the same if they run slide carbs. It's the F2 onwards that had a different one due to having larger c.v carbs. I have a spare filter cap if you find one without.
As a foot note watch out for the imported ones from the US as they have extra holes for the emissions system.

EDIT. Reread the post and the title says B series. It was the A series that went under bucket. So they may work as Rob says below.

Sorry for a slow response been overseas for a while. I managed to source most of the bits I need off a local, but will keep i mind what you guys have.

https://i.imgur.com/GLwDpNG.jpg This one is on Guyzeds bike, not sure if he is still on hte site, there was a german company offering a kit. Think they have stopped making them, so it would have to be like Guys and DIY. All you need is a clutch handlebar master cyl that matches your rh brake and a ...

Building a standard Z650 engine. I have the bottom end parts, but need a good set of barrels and pistons. Also a good cylinder head. It is single row cam chain, I could use a early 750 head as long as its drilled for the top roller and has a cable tacho output.

With winter finally making a exit in York, I have been able to cover a few miles. Initial run had a cutting out problem where I'd strained one of the wires. Back to the shed and replaced all the old coil terminals. Then off for a nice 35 mile ride in the spring sunshine. https://i.imgur.com/YQk09cp....

I had a D1. Best all round bike!

I once bought an alledged 650 harris off ebay, when I cleaned it up it was stamped 550. Tried it on 650 and it rubbed on sump. Therefore a 650 exhaust might hang down a bit on a 550 as height of block and head is shorter on ther 550. Spacing between cylinders does match though.

Finally finished this one off. Couple of things slowing it down near the end with valve guides smoking even though they had been repaired and a carb set up problem. Going to ride it till the weather gets too bad and then get the seat redone in black and maybe put on the Henry Abe wheels I have. Had ...

Used to have a Rickman CR with a tuned CB750 engine. The handling is brilliant. Hope it cleans up well for you/

Thankyou John, I will bear him in mind also, Crofty

Will do thanks. Crofty

Cheers Zedhead, have spoken to Stuart and should be able to get sorted, I will let him know you recommended him. Is your name Dave?

Does anyone know a good carburettor/dyno firm in the north east? I have used Dynotune in Malton, but he is busy till August. The engine is a Z650 with Zephyr 750 top end, GPZ750 cams, VM29mm carbs, V and H pipe running a std airbox. Crofty http://i878.photobucket.com/albums/ab344/Croftyz650/th_20161...

Cheers z1bman, seen that one, but it has the squared off fins, which I could use, but looking for the rounded off version and he has no tensioner

On standard bore. Cheers Crofty.