Monobloc float level effects on idle circuit - request for advice and experience...

I've known my '67 650SS since my cousin bought it new - and I never recall it having anything other than the "finned" extended float chamber cover on the left side, in highly polished alloy - I've recently found from research that this may in fact be a John Tickle accessory, designed to prevent fuel stavation and surging when cornering fast, presumably acting as a sort of fuel "buffer" cache (but actually, I suspect,cafe racer bling of the type fashionable in the day!)

Now that I've taken the bike over and have resurrected it, Ifind that the tickover slows when leaned over or put on the side stand - this to me is a sign that the mixture richens somewhat when the bike is leaned over and the fuel level rises a tad.

When the carbs were re-sleeved and rebult,a viton tipped needle was fitted,which is afew thou.longer than the original all-brass one, so when fitted "as is" inthe seat assembly,it lowered the fuel level and leaned the idle mixture excessively....

I thereforere-set the float level with a manometer (connected to the pilot jet, with cap removed) and using shims to get the seat height right, as per the Amal manual which refers to a "pip" on the float chamber cover, which the text states is 1 5/16" from the chamber edge: this is what I set the manometer level to using shims

Having done this, the "lean over, slow down" is now a little less pronounced than when the viton needle was first installed and the seat assembly "unshimmed", but I still get the annoying richen-slow down when the bike's on the side stand or leaned over attraffic lights - but it does mean that the engine dies away when tilted over, if I set an idle speed of around 900rpm when "upright".

SoI have to compromise with whatI think is a slightly fast gallop when upright, but it's annoying (and doesn't make for smooth changes into first) - andI resent riding with what amounts to the equivalent of a mechanical pin-ball table "tilt" switch, albeit one that affects the bike only when stationary and ticking over.

I've just discovered in the various boxes of bits thatI do have a pair of what I think are Atlas monoblocs, right and left handed - so I may "borrow" the orignal Amal float chamber cover and run a test with this in place of the extended alloy one - but I'd like to retain that particular bit of bling if at all possible - if only because it's period bling that was, I suspect, fitted by the original dealer in Camberwell, who seems to have supplied the other parts found boxed up, including the Tickle rearsets, clip-ons and alloy headstock.

I'm alsolooking for some clear perspex type material thats fuel resistant - any ideas what to use that wont be fogged or attacked by the ethanol-rich fuel that the eco-fascists insist is now Hobson's sorry choice? Thereason is that I'd like to make a float chamber cover for my monobloc to set the float level accurately as the manometer is a pain in the proverbial to use.

So, has anyone else experienced this issue- and if so, am I on the right lines when I deduce a richer mixture with the bike leaned and the fuel level more toone side or other of the chamber - the effect's the same if I lean to the right or left by only a few degrees off vertical. In short (not my style, as you can plianly see!), what's the cure?

DA