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X'2 Like Kwak said, I use moly and twostroke oil mix. Too much might produce a little too much smoke at fie up, so? Too little... well you know what too little will do... The Idea is to provide enough lube until the oil starts to separate from your induction (Fuel) to fog and precipitate on your new bearings. Tuck\o/
Use a good grease for the seals and i pour in my break in oil into the crankcase intills it fills the hole crankshaft area to the top and i let it sit for one hour then i suck most of it out leaving about 3 oz in bottum of case.
Your break in oil should be the same as what you normally run?
the amsoil dominator is made for short life race motors with no rust protection. For long life motor need to look some where else. When we ran amsoil we had crazy fast piston wear. A good semi-synthetic oil is good for long life motor. I buy it from a piston manfu. that makes break in oil for 2 strokes piston rings.
It depends on your riding demand. A guy running his motor with alot of tire up a sand hill verus a guy cruising around his local riding spot will vary. The real way to do it is to pull your reed cage after riding and put a bore camera down the crankcase and look to see how much oil is down there or feel how much oil film is on the crank and rod. With most of the 250 and 500 i build for track use i'm at 20:1-24:1 with any castor oil out there or 32:1 with synethic.