I have been using Castrol TTS for about 4 years now and like it. Once the bike is warmed up there is practically no exhaust smoke. As far as oil spilling out of the pipe half an ounce one way or another won't make too much of a difference. Rich jetting is mostly the cause of that phenomena.
No personal experience with 50:1, but from what I read it is probably not enough lubrication for a 125 or even a 250. My brother ran it for awhile in his KX 250, but switched back. We just find it easier to dump 16 oz ina 4 gallons of gas anyway - i.e. 32:1.
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