ooh, nice. Decidely a Franklin creation, so well within our remit, more of them would be good, noone else seems to cover them. Will try and look up some data when back in States next week. In the meantime, check your email, have some possible guestimate innacurate info for you.

On tappet clearances, the Sunbeam manual suggests the thickness of a calling card for the exhaust, and the thickness of a cigarette paper for inlet when engine warm, altho that may be sidevalve settings, but it gives you an idea, would guess somewhere around 3 to5 thou for inlet, and 5 or six for exhaust as a starting point when cold, hopefully someone will correct me .

cheers,

Tim R

Thankyou Tim and Stuart knew you guys would come up with some ingenious solutions.

Good to speak with you earlier today Tim.

It does, doesn't it.

I have a memory that a '27 AJS sidevalve I used to own had a 12thou ex. clearance, and that was properly clattery until very hot.  I'd be inclined not to use the 15thou and go down to 10-ish, personally.

Typo should read AJS H6.

Stuart that is a stunning motorcycle,I love my 101 and can understand what a tough decision that must have been to equally part with your G6.

You beat me to posting on the valve clearances which must be pretty close to those of the OHV Prince having found a copy of Pitman’s Book of the AJS on the internet.