Quote:
Originally Posted by steve25
One quick way to check jetting is this.
Get the motor fully warmed up.
Disconnect the carbs accelerator pump.
With the motor out of gear and idling wing the carb wide open.
There should be no backfire which would indicate a lean condition.
If you hear no backfire which then you at least in the start of ball park in terms of wide open jetting needs.
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No one in their right mind should use your method.
It says NOTHING about how accurate the calibration is.
If it would work without an accelerator pump why do ALL carburetors have one?
Instead use the "tip-in" test with the choke blade or the palm of your hand at about 2200 rpm.
A small increase in rpm of about 50 rpm indicates a proper mixture.
If the test run turns out to be satisfactory then all is well.
FWIW