John, it takes a lot of pumps of the priming lever on whichever fuel pump is pumping to fill both carbs. When the carbs are full enough to close the float needles, you should feel the priming lever stroke doing less work.
You can test the booster coil by unscrewing the booster coil connection from the right hand mag and holding the end about 1/4" from a ground while pressing the starter button. (The booster coil only works while the starter button is pressed.) You should see lots of sparking.
But based on my experience, the booster coil provides very little assist to starting. I bought a NOS one and it bench tested ok. But when I cranked the engine with just the booster coil providing the spark, it just fired occasionally and came no where near starting. As soon as I put the mags in service, she fired right up. I figure I wasted $400.
On our Mk 5/2, there's no shutoff on low coolant. There's no level switch on the header tank, nor on the wiring diagram, and the only thing that grounds the mags and stops sparking is switching the ignition switch to off, or pressing the mag test buttons.
Malcolm
|