Tuning my motor

[Gordon england brooklands]

I renewed my worn floatbowl needle valve recently(thank you Robert Foreman four directions to Southern Carburators web site). This has stopped the flooding problem,but the motor won’t now start without a spray of Aero Start . I am using a Solex M V 30 carburettor with 21 mm choke , 105 main jet ,55 slow running jet and a 47 gm float . I tried a 42 gm float ,this gave a fuel level just lower than the 3 mm level the Solex manual suggests. I hope someone can give me a remedy

[Charles P]

I renewed my worn floatbowl needle valve recently(thank you Robert Foreman four directions to Southern Carburators web site). This has stopped the flooding problem,but the motor won’t now start without a spray of Aero Start . I am using a Solex M V 30 carburettor with 21 mm choke , 105 main jet ,55 slow running jet and a 47 gm float . I tried a 42 gm float ,this gave a fuel level just lower than the 3 mm level the Solex manual suggests. I hope someone can give me a remedy

So does the 47g float give you the necessary 3mm or is it also wrong?

Charles

[Gordon england brooklands]

Hi Charles , thanks for the reply . The 42 g float gives level just below 3mm . The 47 g is 1 mm lower than rim of main jet mount , without the flooding problem . With the 47g float the motor runs OK but won’t start without a Spray of Aero start . The motor won’t idle below 1100 rpm , the motor is fitted with a Dante aluminium head a moderate camshaft , 28mm inlet valves and Phoenix pressurised c/shaft and con rods and J P pistons

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Charles , The motor has been built and running well until the new needle valve was replaced starting was not easy but now it won’t start without aero start

[Chris Garner]

GEB,
I'd get back to Robert - he's the guru.
My Brooklands has the same settings and is fine, although a tad rich.
Chris