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Pick-up timing is where throttle plates start to open.

That head will be warped too.-----They all are after 40 years !

Perhaps too much pitch on the prop.-----You need to install a new water pump impeller.----Inspect exhaust tuner while lower unit is off.

Likely no chance of financing anything older than 10 years.-----Doubt you will get financing on a project boat.

Motor cowling makes it a 76 model I think.---Motor will run / idle all day with 40:1 mix and do no harm.----Just another example of how the concept of 2 strokes and oil in gasoline is mis-understood.

Found a loose NUT on wiring, I think.

Fuel pump diaphragm ruptured ?----Exhaust tuner plugged ?-----Post actual compression values.

The head is warped.----So refinish it with emery paper and a piece of glass.----Head gasket may have been leaking.

Parts for the 6 HP of 1968 are easy to find.-----Easier than some new motors.

On the TN / TD / HD models you can adapt a float from a MERCURY outboard carburetor.

Must have found used parts as new might be big $$ or NLA.

Went from a 20" center console to a 29.5 Scarab Sport.----Just so I could go out on any day I was off work.----No issues on one of the great lakes.

They have to be offset.-----That is how the space between vanes changes for the pump to work.

The pin is bent !----Need a bigger hammer to drive it out.

It is commonly known as a ----SLINGER ----type of seal !!

Use a simple bungee cord to stop prop from rotating..-----There are many tricks and things that a boater can learn.

???----It is just a slinger type seal.----Used on many motors for years.

Timing can be set using a feeler gauge to set points to 0.020"-----Or using a meter / timing marks on the flywheel you can set the points " deadnuts " to get strongest spark.-----Lots of videos on u-tube to tutor you on these simple magnetos.

Overheat alarm went off ?------You did replace the water pump impeller I hope.

?????----Shown as item #41 on the 1990 to 1994 model ----gear housing ---diagram.