Dumb Question Thread - No Flaming Allowed

[bmwfnatic]

If they have that green O-ring, that means they'd need to be replaced, yeah?

Officially yes, but if you put it on recently and not years ago I think they will survive reusing once for sure.

[bmwfnatic]

Any ideas on what to use to remove residue from cylinder walls?

"Carbon X Combustion Chamber Cleaner K1+K2" is a product that cleans carbon deposits insanely well.
It's a 2 part formula, one is the cleaner, which is like a thick shaving foam, and the other part is the neutralizer, which makes the foam turn liquid on contact.

The stuff is strong enough to clean without any abresives, I wouldn't put scotchbrite anywhere near my cylinder walls, it is effectively still sandpaper.

Just be cautious you can do more harm than good cleaning the combustion chamber and the top of the pistons if that means a bunch of gunk goes into the ringland area.
Painters tape is your friend...