Petrol taps

[A10Boy]

Are you losing patience with an owner determined to spend his way to biking happiness?

No not at all, we [I mean the responsible ones] are in a way like museum curators, we are taking the trouble to own and restore our lovely BSA's usually at great expense. we get HUGE enjoyment and its gets in your blood. Anyone involved should be helped as much as possible when needed, and I know I need help sometimes.

This forum is a very useful and enjoyable place to be.

[Triton Thrasher]

What I am not sure about though is this. Is there a direct coloration between static flow and the demand from a running engine?

I think so, but you should include the float valve area as a possible restrictive area too.

The old cork taps are marginal in flow capacity, on a big twin pulling hard and I do not care what counter arguments theorists come up with.  The lever taps seem to be prone to blockage by displaced sealing material.

The smallest cross sectional area in the fuel feed must be much bigger than the main jet, perhaps because fuel is sucked throught the jet while it only runs through the feed.  If you're unlucky and going fast, a single instance of fuel starvation can make your engine seize.

At 6000rpm, full throttle in 2nd gear, the miles per gallon would shock you.

[muskrat]

At 6000rpm, full throttle in 2nd gear, the miles per gallon would shock you.
Yep. On my A7SS racer running on methanol with 2 X 32mm concentrics it got about 12 MPG. But 2 of those lever taps fed it fine.
Cheers

[A10Boy]

A101960, If you are a normal guy running a normal bike at normal speeds you wont have any problem with one lever tap - provided that filters and vents are ok.

[Triton Thrasher]

A101960, If you are a normal guy running a normal bike at normal speeds you wont have any problem with one lever tap - provided that filters and vents are ok.

Yeah, until you have to leave town quick, overrevving mercilessly, pursued by zombies.

Actually, I think most people agree that the lever ones are good, except when faulty.

[muskrat]

G'day all, I must be JINXED. After saying those lever taps were good one of mine failed after only 60 miles. Whilst debugging the new motor it cut out on RH side. 1 million horrible thoughts go through mind. OK start from beginning, spark check, comp check, fuel bugga. New flat slide carbs, more horrible thoughts. Fuel in tank OK, not in carb. Bloody tap. Looks like the rubber doesn't like the go fast additives I use. Now running a pair of VICTA LAWNMOWER taps. Another 60 miles, so far so good.
Cheers