Cylinder head removal, anti seizing bolts etc

[Smagu]

Hello

Removed cylinder head due to overheating. Great tel tale and new thermostat but overheating at high RPM. Squueky bum time removing the bolts (Don't think they had ever been off original pain on them). Cylinder head was stuck on but I turned the engine over and off it came...

1984 yamaha 80 hp 2 stroke

So I'm currently cleaning passages. Also removed water jacket (probably shouldn't have as its nice and clean)

What should I put on the bolts to stop them seizing when I replace them?

Any thing else I should check while I have the engine so stripped down?

Planning to buy my gaskets from SSI marine as they are far cheaper than OEM. Anyone got gaskets from here? I've got other thing's from them which have been great quality.

Should I put anything in the cylinders to protect them while waiting for gaskets? Covered them in fogging oil for the mean time

[Smagu]

Theres £75 difference between an OEM and an aftermarket head gasket from SSI. Is this something I should splash for OEM or anyone have experience with?

[beamishken]

Originally Posted by Smagu

Theres £75 difference between an OEM and an aftermarket head gasket from SSI. Is this something I should splash for OEM or anyone have experience with?

I've been building engines almost 40 years & with the odd exception with a highly strung engine I always use copy gaskets that 85 it pretty low tech in reality so copies should be fine.
A squirt of spray grease in the bores or even a smear of any grease will stop surface rust from condensation while its apart. I find with marine engines if its a bolt that isnt likely to be disturbed for a long time then medium strength locktite is the best for preventing seizing from corrosion as it stops moisture wicking down the threads. Head bolts are supposed to be installed lightly oiled & in an ideal world shouldn't ever see moisture on the threads but we know they do see moisture as they do seize, plenty of grease or graphite antiseize would be my method, don't be tempted to use copperslip on anything that gets warm as it can act like a solder & actually make things worse

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[A1an]

and don't forget to run a tap down the holes before putting bolts back in.