Amal Main Jets

If a main jet is stamped say 260 does if flow 260cc of fuel a minute?

If the engine is at full throttle for a long period of time (long straight), will the jet flow more because of the vacuum pull of the engine?

Does the head of fuel in the tank make a difference to the flow rate?

What is a good static test to see if everything flows adequately through the whole fuel system, ie tank vent, fuel tap, hose, filter, float needle, main jet.

Don't want to be a smart ass, but if it's running fine all those statistics are a little too much info. Do you have a specific problem :? ?

If a main jet is stamped say 260 does if flow 260cc of fuel a minute?
No idea
If the engine is at full throttle for a long period of time (long straight), will the jet flow more because of the vacuum pull of the engine? No

Does the head of fuel in the tank make a difference to the flow rate? Yes but as long as it is above the max flow of the main jets there should be no effect

What is a good static test to see if everything flows adequately through the whole fuel system, ie tank vent, fuel tap, hose, filter, float needle, main jet.

Remove the floats and suspend above a measuring jug, turn the tap on for 1 min and then see how much fuel you collected.

Repeat with both taps on and see if it differs.

This covers everything but the main jet, but that never wears and as long as it is clean should meet its specs (whatever they are ?)

pouchy750 said:

If a main jet is stamped say 260 does if flow 260cc of fuel a minute?

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Yes.