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And that right there was what I was talking about in another thread about Sierra coils just the other day.

Now that one made me laugh.

What plug are you using?

I have been guilty of using their water pumps really with no issues. Coils is what I hate especially on old smaller engines. I don’t know if it just my luck or what but their fit usually has been terrible and I spent more time fitting them than the actual job should have taken. Never that issue...

Their ignition part are great if you like to make them custom fit. Or let the flywheel grind them down. Their carb kits are good also, if you don't need a complete kit.

My guess if it was sucking air or fuel pump it would be worse full throttle. I am guessing carb ajdustment or cleaning.

I haven't seen any blue but you are correct, that is exactly what the silver looked like when it would separate.

It is a very primitive way to do it but you can run one of those at night or in a dark shop and if they are arcing to ground many times you will see it. Of course there are plenty of places they will be doing it that you can't see. But I have also seen motors that you could take the cowl off at...

That head doesn't really look that bad. You have one place that looks real suspect that the gasket may have been leaking. The pic. isn't great, but it is suspect. Appears to have been leaking to the outside.

I think you will find the selection for true 'flat' bottom boats in the size you want very slim. I think about all of them will be at least mod. V.

I don't know what class a 25 falls in but I got one once that stuff was on as a fuel line to the tank. It would suck completely flat.

The gray is junk.

Fuel delivery always comes to mind when one runs fine low speed or without a load. Loose fittings, cracked lines, clogged filter and screens are all suspect. That is the simple things to check before it gets more complex.

Depending on how old of motor it is yes, you will have to replace the gaskets, the older ones had cork gaskets and they were pretty much one time use anyway. Those were pretty simple carbs and on the scale of carbs I would rate them "easy".

If I didn't get but a teaspoon of water out I wouldn't necessarily jump to the conclusion that it had any blown gaskets. Depending on where the motor has been setting it could possibly just be condensation. I would carry on with a full compression check before I did anything drastic and hoped...

90 wt will work, true lower unit oil has additives in it where in case water does come in the picture it will still hold up much better. That is somewhat primitive in describing it but true.

I spent many hours in a boat like that for work, very stabil and seaworthy but HEAVY. If you are going to make any long runs or pull any tubes or skiers you better get as large as the data plate allows.

I run SS prop on a 25 because I run in places I was all the time hitting stuff and got tired of fixing and replacing props. I never notice that they "robbed" me of any power. I have since made this to stop hitting stuff so whatever I use as prop material is a moot point. https://flic.kr/p/27sQ8Bv

I hope he didn't pay more than scrap price because if that bottom is painted with the same paint that is exactly what he has.

There is one other thing you could do. You can make a steel or aluminum adapter plate to go on the side of the engine where the original pump came off. Tap it for a 1/4" barb fitting and then go buy a OEM Briggs and Stratton pulse pump, they will be only slightly bigger than that factory pump...