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I think he is referring to the 2 powerpacks as " control boxes "

I do not believe a " knock sensor " can be fitted on a 1973 4 HP !!!-----Who are these clowns suggesting that ?

There are 2 powerpacks on the motor.-----Look into the control box at the helm.-----Might find a gray wire there.-----The factory tachometer operates with alternator pulses.

Does spark jump a gap of at least 3/8" on a test device ?------Is the high speed jet in the very bottom of the float bowl clean ?

Run with a timing light ( 1 cylinder at a time ) and see how spark behaves when motor falters.

??---Post picture of the speedometer tube that you see.

See post #2 ----Or is that nonsense ?

Are you sure that is the correct distributor cap for your motor.-----Perhaps another case of --" they look the same"----But are not the same.----Put the old cap on and test run ?

Excessive exhaust back pressure is a far fetched idea.----Remove cowling.----Start motor.----Look for a leaking gasket / hose.

Part number of the NOS distributor cap ??

And the model # of the motor is ?

???----How big / heavy is the boat ?-----How fast to you want to go.-----A 6 HP motor can move a 10,000 LB boat, but not very fast.

never mind

Tube that feeds a speedometer I think.

There have been issues with crankcase sealing rings.----Results in low crankcase compression.----Post the actual cylinder compression values.-----That may offer a clue.---Yes, you can put a PRESSURE gauge on the port to see what happens.----The fuel pump does NOT run on vacuum !

The fuel pump runs with the PRESSURE from crankcase compression.----That is not the same as compression in the cylinder !-----There may be an issue with crankcase compression and fuel pump does not work !-----Mix the fuel at 50:1 in the portable tank.----Have your assistant operate the manual...

Hook up a timing light.----See if it loses spark when it quits.----Disconnect the black yellow stripe wire at powerpack.---Test run.

Friends of mine had one of these motors on a 17' deep V boat.----Skied many miles behind it.----Used to pull 2 skiers out of the water with slalom skis.----A real powerhouse.----Take starter apart for inspection.-----See what it needs.

Your location ?----There are a number of salvage yards.----Perhaps one in your area.

How did this motor run for you last season ?-----Tried jumping directly to the starter ?---Bypassing the safety switch ?