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Be the same as the 83 and 85 models.

Hose with 5/32 ID would be more to my liking.

Decals were used in 81 / 82 / 83 model years.----A very good motor if you are willing to learn how to fix it yourself.

That be the plug for a tachometer.----I have always said that electrical stuff / wires is confusing.

So was your motor a 50th anniversary and a 72 model ?

Maybe the bypass covers are warped.----It should be easy to find / correct any leaks on the crankcase.

Some had a plug on the control box.------I can not see or feel your control box !!-----Do not know if yours is a control box from 1973 or 1995 !!!

It appears he has a tester as per post #12-----Says he can't get more than about a 3/16" gap to fire.-----Posts a picture of it in #15 and apparently it will not fire across a 5/16" gap.

The bulb is a simple manual fuel pump.----It must go hard when carburetors are full.-----Look into issues with electric primer valve or float valves.

A few bad reviews I think.

When shifting on the repair stand you have to turn the prop.

The 50th anniversary was 1972.

The motor is running when you try and shift it ?

???---Look at the shaft on the port side of block.----And I know that the impeller drive pin is not plastic !!--I did not mention a pin on the driveshaft.-----Some simple trouble shooting needs to be done.----Good luck with your motor.

There is no difference between a 70 and 71 model except for cosmetics / color of paint.---Run with timing light hooked up and see if spark goes away on one cylinder.-----It should be easy to determine the loss of power.-----Plastic pin on bottom of vertical shaft still in one piece.

If coils have never been replace it is due for a set.----Pull the flywheel.

You think you have spark but to me it appears you don.t.-----With starting fluid the motor should at least bark at you like wild dog.-----revisit ignition work !!!!

It is a Mercury tachometer.

Why the----haha in post #3

Looks like sparkplugs were not at fault.----I do not like plastic tanks.-----I prefer the metal tanks from the 1960's and 70's.