24-11-2017, 11:04 PM
(24-11-2017, 10:43 PM)Dave Mann Wrote: I've never tried fitting extra fibre washers under the seat, I've always moved the collar, however if you haven't got the original weight brass split pins and are using ordinary split pins make sure the tails aren't too long, they can stop the float from going up. To reseat a needle and valve I hold the needle in a pedestal drill and with it on its slowest speed add some T cut to the needle and present the seat to the needle. I use very little pressure and keep lowering the seat away from the needle, too much pressure or allowing it to run dry will mess it up.
Dave. My bob weights are brass with brass pivot pins that have a small head & a tiny hole the other end to pass a lock wire through, very neat & nicely made. I think that the float may be the root of it all.... if the bowl is full of fuel & the top is off then it floats with almost no freeboard! ie the top is almost level with the fuel level. consulting Mr Nicholson this is not correct, if his sectioned drawing is to be believed. My copy falls open at Page 38 "the carburettor", so maybe it is not an unknown problem. I will take the carb off & see where the level is relative to the jet. Fluid will find it's level! My bodge of raising the valve did not make it easier for the needle to seat and the needle did not "feel" right! Nicholson tells you how to move the collar on the needle...his method suggests it was an interference fit. I cannot imagine that the collar is wrong on the new pin, so the float is Suspect No1.
My Hong Kong Californian AG (?) project has arrived this evening, so this problem may take a bit of a back seat while I see what I have got!
Thanks for your help
David