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The air box in front of the carburetors.----Look for a nipple near the bottom.

Did you replace the o-ring that seals the shift rod ??----Often that is overlooked.-----The gearcase is sealed.----No condensation in there !

High speed jets are listed as NLA----So you have to search E-bay / make some.----Or find a size close and modify them.---Not hard to come up with a solution, in my opinion.

You have now discovered one of the issues with " modern " corporations.-----Keeping a supply of repair parts in a warehouse is very expensive.----So they just do not bother anymore..

So you threw out the old bowls with the high speed jet ( orifice plug ) stuck in them??----You would not be the first or the last one to make that mistake!

I say lip AWAY from engine block.---If you still have the old seals you might see which way you removed them.

??----Shims are used to get the correct fit of parts.----In this case the end float of the crankshaft.-----If there were none , then maybe they were not needed on this engine block.

The tube that runs through middle of carburetor is called the NOZZLE on these.-----#15 is the high speed jet and even the fuel for the low speed mixture must first go through #15 on most carburetors.

The high speed orifice plug #15 must be installed for operation of this motor.-----Are you calling the FLOAT VALVE the main jet ?

Defective temperature switch ?.-----Time to test it.

Just 4 screws nearest the crankshaft.-----One in each coil and 2 nearest the crankshaft.-----Those need to be loosened about 6 turns or so.----

??-----Why not take the bypass cover off to do an inspection?----Easy as can be.----Starboard side of the motor.

Year ?---Model # ?----A 2 stroke or 4 stroke ?

Hence the reason for the question in post #26.-----Tried to save you time and aggravation.-----No need to remove that water jacket cover.-----You won't see anything you can not see through the sparkplug hole !-----Remove bypass covers on the side.----A much easier task.

Correct.-----I have a bunch ( 40 feet ) of the wire core stuff on hand for my projects.------Boat dealer had it in stock.-----This simple magneto was first installed in about 1950 and was installed till about 1990 on some motors.---Used on 1.5 / 3 / 5.5 /7.5 / 10 / 18 / 20 / 25 / 28 / 30 / 35 /...

???-----Your local boat shop will have a roll of proper wire.---An every day simple item.-----Needs to be 7mm with wire core.------That magneto is elegantly simple to repair / maintain / cheap parts too.----Visit -----leroysramblings-----for all you need to know !

?---What cover where you trying to remove to inspect pistons ?----A bypass cover or the cover around the sparkplugs?------Only by removing bypass covers on the side of the block can you inspect pistons !

The early 3 cylinder used a less than robust gearcase.----Issues with top cylinder dome cracking.----Flimsy cowling.----Designed in a hurry to compete with popular OMC 3 cylinder motors.

I think 1971 was the last 4 cylinder 65 HP.----Those early 3 cylinder motors were never in the top 10 on the hit parade.

Take the cowling off.----Post 3 pictures of engine.----Post pictures of prop / lower unit and midsection.-----Your first 3 pictures mean very little !!