The logic is as long as you got enough gas in the carbs to run once started the inlet vacuum open the tap once you shut off it closes so you don't need to remember to turn the tap on and off, otherwise operation is the same. If the carbs are dry or fuel is low in the tank you need to turn the tap to prime which bypasses the diaphragm. Once started you turn back to on for auto operation.Grey_Ghost wrote:Thanks for the info! A couple of questions, however...How much of a role does the vacuum diaphragm play in the big picture? Will just using a regular petcock cause issues with flooding/starting/running?akendall1966 wrote:You can get aftermarket tap complete …….
AK
I run the OEM tap but disabled the diaphragm operation so it acts like the aftermarket manual on / reserve tap. Works fine, not being a daily rider prefer having to remember to turn the gas on over a crankcase full of petrol if the diaphragm and float needle are a little leaky. Once you develop the habit of gas on, ignition on -ride- ignition off, gas off its all good