Don't worry too much about the outside.

and i hope you havn't been cranking them.lol

It's just a single cylinder..not really much to and RC nitro engine.
it's almost fool proof..there's a pin to align the sleeving...i guess if you can't
see the exhust opening after you put it back together..it's wrong.lol

Take it apart..good old DW40 ...basically you want to prevent scratching the
cylinder's sleeving and piston....if they're ball bearing engines. You want to get
rid of rust on rusty balls.

You don't want those rust particals breaking up..while the enignes are running..lol
They will fly around everywhere and get jam between the sleeving and pistion..rub , rub, rub at 10000 rpm.

same with the carb's barrel..don't scratch that bad boy.
You know how some people say..their engine won't shut down when the barrel is completely closed..
well..I image there's air entering the enigne somehow...maybe through scratch surfaces of the carb's barrel.


yeap the anti freeze stuff is over kill...there's a coating on the engine..and you're going to remove that coating ???[sm=spinnyeyes.gif]
I guess cooking nitro engine is an art or a hobbie.lol

Remove all rubber parts..basically the O ring for the carb and the gasket for the backplate.

Just let all of the metal parts soak in fuel overnite to break up the crud.