The usual cause for 41064 being deformed is that ( when refitting the front wheel and tightening the axle nut) the speedo drive tabs not being engaged with the cut-out slots in 41064, the drive tabs are deep behind the speedo drive's oil seal so you don't realise they're not lined up, so you tighten...

if you clean the grease off, it looks like you can see the big dark grey circlip with the 2 holes for your circlip pliers. Remove the circlip (might be stiff in its groove so take your time, use WD40, just do it a little more each time so you don't end up destroying the holes) then the speedo drive ...

Warren suggested a weak mix causing the spitting back. The table suggested the air screw 1 1/8 from fully in , and you have them 1 1/2 out you said. That would make the closed throttle mix too weak , by flowing more air

if the carb to head rubbers are drawing air and causing the revs to hang when you shut off, you can check by spraying a but of easy start around the rubbers when the engine's idling. If the revs rise as you spray 1 rubber, its leaking

+ box section swingarm.

I know you can get kits of thicker engine mount plates - that would stiffen things up , and would be easy to add at the stage you are at now.

if you used a little dialectic grease there( ie electricity- conducting) after doing your yearly scrape then that might slow up the oxide reforming between the crankcase and the ring terminal

braced frame was a worthwhile period mod, especially if you're going to try and add power but looks like it's too late for that now. sorry to piss in your chips.

your bike's lovely , keep an eye on the posts for meetings etc.

sounds like a great and worthwhile day out, and nice one Fer and Kath.
It would be nice to have a couple of Zed meets next year to put faces to the names

It bolts directly to the tank top surface - I've included a photo as it was originally

Racing- type twin quick filler , came attached to the hand built tank I got with the project I'm working on. I've converted the tank to a more conventional opening. The tank was made originally by the Tank Shop in Dumfries , I have spoken to John there and he remembers the tank and has pointed out t...

we await with interest your application of logic and stepwise exclusion of possibilities - it's what we all try to do.

to clarify - resistances and continuities in each coil, and compare the readings between the 2 coils

I tried the Wired george mod to give the coils full voltage and it melted them., 1 after the other. If you have a multimeter compare the resistances and continuities between the 2 coils - you should be able to do this without removing them. 1 of the coils might be on the way out, and reversing the m...