JR North wrote:
Secondary ignition breakdown. Look for cracked plugs, arcing plug wires
or cracked/carbon tracked dist. cap/rotor. Also, possible open circuit
in dist. pickup wires when advance plate moves with RPM.
JR


Spark advance is controlled by the ignition amp... isn't it? No moving
parts in the distributor only rotor. Replaced dist. cap and rotor, will
test tomorrow.

Still wondering about fuel delivery especially fuel pump. Spoke today
with pump rebuilder and he says if the pump is good to 2000 rpm chances
are it should also be good above that (no leaks etc.). Coil spark is
inch long, clean and blue but if ran through the plug wires to the
screwdriver becomes purple-blue with (yellow from the screwdriver to
the ground). but still jumps over 1/4 inch. At the plug it is purple.
Disconnected tach wire and will remove shut-off wire from the coil.
Would be great to have ignition tester like Mallory or MSD to take
ignition through paces without running the engine. Pretty annoying.

Carb has been rebuilt 6 weeks ago, accelerator pump works OK.

I was also asked about the prop pitch if not too high for this
boat/engine but 19P Laser II should be OK, don't you think?