Ok, the point is to see at what crankshaft angle the fuel begins to flow
for that's the mark, so to speak. The target is 24 degrees BTDC. The
amount of fuel is not important - that's controlled by the throttle.
Turn the motor right handedly veerrryy slowly from 30 degrees BTDC until
the FIRST drip occurs, then STOP turning for that's the reading that's
produced by the IP's current setting. Read it from the crank.
If fuel drip occurs at say 26 degrees BTDC then the injection is 2
degrees early or advanced and the explosion inside the cylinder will
occur before the piston is quite at the top of its stroke so the motor
will be working against itself.
A bit late, say 22 degrees BTDC (retarded) will cost a bit of power but
is a more forgiving error than the motor being too far advanced.
Turning the top of the IP towards the engine advances the injection
timing; turning it away from the motor retards the timing.
If you cannot achieve 24 +/-2 degrees then I suggest you set the
crankshaft angle to 24 degrees BTDC, remove the IP and turn its gear so
that its missing tooth is aligned with the mark cut into the collar
behind that gear and reinstall the pump without turning anything. Then
you will be certain that the pump is approximately correct and can set
it to 24 degrees BTDC using the drip tube
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