||Good news for racers running
the Walbro WB3 carb. From the 1998 I.K.F. Tech Manual,
rule #616.7.4 Metering Diaphragms: May be captive or non-captive.
Captive diaphragms may be modified to be non-captive, no other
Now what that means, for those who sometimes wonder why their pop-off
settings seem to be erratic, you should have consistent pop-off
pressures by switching to non-captive. The captive metering lever
sometimes binds causing pop-off variations. Walbro offers a non-captive
diaphragm rather than modifying the existing one.
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