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You need to install the repair kit to stop the leak.-----This wonderful electric primer valve replaces choke flappers.-----First came out in 1980 model year.----Used on 9.9 to 300 HP motors.----When you crank over the motor you push the key in.----This valve opens and sprays fuel directly into...

#15 is the high speed jet.---Calibrated to provide the correct amount of fuel at full throttle.-----Often forgotten / overlooked during cleaning.----Or missing altogether when changing out warped float bowls.

Try-----evinrudeparts,ca-----They may be able to help you.

What pitch is the prop that you are using now?-----And is the motor well maintained?-----You need a new water pump impeller in that motor about every 5 years.----Or test the hot / overheat horn , if control box has one.

Might consider doing the other head , now that your tool box is open.

Adjust lifters / rockers ?

Should be an easy project.

What motor?----A 2 blade might work as well.

Next is a check for spark.----Does spark jump a gap of 3/8" on each of the 4 leads , yes or no ?

Step #1 is a compression test.----Post your actual values here.

When you understand how things work , the trouble shooting becomes so much easier.

I think they all have that hole.----Any water in the gear oil.----Has to be there to drain water from a cavity.

Present facts.----Is there an oil tank in the boat , yes or no ?

Not many pontoon boats in my area.----But pontoons are generally slower through the water and may not develop as much water pressure.----Hence the different spring.-----Your local Mercury dealer will likely help you on this.

There must be a --Chriscraft ----Owners group.-----Or Antique boat club online.-----Many of those folks are very helpful.---Boat museum in Clayton , New York is also a source.----Was boat properly winterized ?

Very easy to remove the 4 bypass covers to inspect pistons / rings.

I believe that site has the exact wiring diagram for your motor.----But do a complete evaluation on this motor BEFORE spending beer tokens on it.-----And --"great compression " -- means nothing to me.----Post the actual / accurate values.

Normally open to run.----And that switch on your motor had 2 wires I think.

Find a wiring diagram on line.----maxrules---or a few other places.

Install a factory solenoid.-----Starter must spin the flywheel fast to generate the spark.-----The loose foam ( mice ? ) bits must be dealt with.