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Not many folks who buy the latest / greatest new technology are concerned these days.----People buy electric vehicles from start up companies as an example.----Would you buy that new car if you knew that head light lenses were $2000 or so?-----Or if it is $150 labor to install a new 12 volt battery.

If it shifts from forward to neutral you just need a bit more effort to get reverse.----And if the gearcase was replaced with unit from say 88 to 96 the drive balls ( no clutch dog ) might be missing.----Did one once where I assume the balls fell on the floor and went away.-----Unit was...

I do not believe there is a wire going to thermostats.

See your local dealer and get his opinion on parts availability / cost of service.----Do a compression test before you decide on it.-----Or better yet just walk ( run ) away.

I would say motor is running too cold when trolling.----Check thermostat.-----Should be able to troll for a week without having to change plugs every hour.

Other than guessing about the reed valves , what trouble shooting has been done ?

Run fuel out of the carburetors when you are done boating.-----Empty carburetors stay clean.

Inspect fuel pump diaphragm.

We are talking 4 stroke on this thread.----The book shows an idle mixture screw.----The book shows an idle speed screw.--------Books says 4/5 turns out on the idle mixture screw.----Idle speed screw limits closing of throttle plate I believe.

Agreed----Most folks are limited to pushing buttons.-----If there is no button to push folks are stumped.-----Common sense often does not exist.---.------Folks even need a monitor / warning to keep track of oil in their vehicles.

Local garage is swamped with customers / work.-----Not sure what I will do when they retire / sell the shop.

See post #18-----Taking the cylinder head off to inspect cylinders is the quickest / easiest / most cost effective step in trouble shooting.----Very few people can accept this simple fact.

You will be delighted with a new 4 stroke.-----Computor does all the thinking for you.------Trouble free boating with a 4 stroke until there is trouble.

These motors may have had a history of rocker arm wear.-----Checked valve clearance on it or just drilled the hole ?

The early JOHNSON / EVINRUDE 4 strokes were their own design I believe.-----After all they used the ( modified ) 2 stroke carburetors and familiar lower units.----Ignition components were also similar to 2 strokes.

Reed valves are nowhere near the sparkplugs.----Each set is for one cylinder.-----You are running with black plugs on both cylinders.-----Find & correct the real issue.----Looked at the primer system ??

Agreed ----laying a plug on the block and observing some spark is a waste of time !-----Must be a reason why some ignition systems can jump a gap of 1/2"

Sure it is a Suzuki ?----Have not seen a model # on this one.-----Not sure if EVINRUDE marketed the rebranded Suzuki 9.9 models.----Johnson did for a few years.

That motor will troll / idle all day long with no issues.----Test thermostat.----Check the primer / manual or electric.

Looks to be the right kit if lower unit is original to a 79 model.----Did you pressure test after you installed the kit ?-----Pressure test now to find out what is leaking .