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I have 2 questions.

Does it matter if your fuel line/primer bulb are not 100% tight?

By that, my primer bulb can freely rotate around the fuel line, but it doesnt leak, and my tank fitting is a bare hose on a brass nipple with a hose clamp, its an aluminum tank.

The second question is, what can cause a 2 stroke outboard to fail that is pre mix, besides over heating due to failed impeller or thermostat or obstruction.

And by fail I mean lower compression.

I just bought a 1999 johnson 50hp. Its premix 2 cylinders 2 carbs.

I assume, keep impeller sat, lower unit oil sat, spark plugs sat, fresh water run thru it after use on ear muffs, keep all fittings greased, and fog cylinders if i store it.

How can it fail if i pre mix it correctky everytime?

Thanks.

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Do you know the maintenance on the engine prior to your purchase? Do you know the number of hours? Things wear out. Parts fail. Engines break. Excrement occurs.