Many thanks Slinny and Charlie P.
Bike is coming on slowly. It was a non runner when I got it and I'm doing a full engine rebuild. Rebored and Higher (8.25:1) comp piston. New Big/little/main bearings, valves, guides etc. I am reassembling it. Inlet valve had 'pocketed' due to too many re-grinds so now have a bigger 'Victor' valve to help her breathe. Amal concentric is fitted (as recieved) but it probably had a monobloc as standard. I hope to get it back on the road as 'standard' but not particularly 'restored' as opposed to 'useable' condition. From there on I shall try to lighten her and replace steel with ally where possible...... oil tank, petrol tank, mud guards, wheel rims, centre stand off and folding steel footpegs (oh, and a hooter that doesn't weigh a kilo!). This should lose up to about 25Lb. Fitted drive sprocket was 21 tooth. Standard is 18 and trials 13 so she would have been somewhat long legged for road use. I'm getting a 17 toother which should be ok for green laning and the odd event. I'll post piccies when I get somewhere near running. If anyone hears of a rear wheel and brake assembly for a Tiger cub or even just hub and brake, I can get laced with an ally rim. It would be a better set up than the rather heavy quick release rear wheel that is fitted.
Cheers,
IGK