Carl, the needle valves are from burlen fuels they are either 0.096" or 0.125" bore> the standard ones for hs6 etc are 0.070" as for the float lid positions i turned the front one so the inlet pipe is pointing to the left hand side. ( this is no problem as the mounting holes line up, just need a bit of longer fuel hose) the rear carb is a bit more tricky as the fuel inlet pipe needs to point to the air box. the mounting holes don't line up so i used some washers under the screws to hold it down. Before i changed these round i was having so much trouble when doing track days or autosolos. i thought it was fuel surging so fitted a swirl pot etc all to no avail. it was out of sear desperation that i started messing with float chamber lids. after much testing one Sunday on an industrial estate with plenty of islands i came up with this solution.