I use caster 927 in my old machines (78yz250, 74mx360) I feel the caster is nice and sticky so it oils the old machine and keeps it not sticky but oily. I run 32:1. I have noticed that if i mix some caster and gas, if i dont use it and it sits for a week, it will tend to seperate and the oil falls to the bottom of tank.
In my shee i use yamalube, i usually tend to mix slightly heavier then 32:1, sometimes im riding really hard or in hot weather.
I have a freind with a all stock 06 shee, 86250ratc bolt on mods, 88cr125 hot rod crank, and a polaris scrambler, he uses amsoil and he mixes 80:1. I told him he was crazy.
I had gotten a 97yz125 for cheap(bike was stolen from me april of 09) and he gave me a bottle of amsoil so i used it at his mixture, the bike ran fine. But i still dont trust the lean. Before the bike was stolen i swithched back to yamalube.
I dont like to use difrent oils, i like to start with one and keep using it (yz125 was a exeption).
Does anyone knoe if it hurts to swithc oils?