[stay_upright]

I found that running clean has more to do with how well the bike is jetted at low throttle openings than the oil ratio.

If the bike does not pull cleanly from low throttle openings i.e. just off idle then it is 4 stroking and every other cycle is a misfire which deposits plenty of oil all down and out the exhaust, particularly when you accelerate this all comes out as smoke and spooge.

I'd also be nervous at running 100:1 the protection oil provides depends on the thickness of the oil layer between the metal bits it is trying to seperate, which is dependant on the quantity of oil between the surfaces among other things, some-one on here has already proved scientifically that using more that 50:1 reduces wear significantly so I'll be following his findings and richening up my 50:1 but with a clean jetted bike I should have nothing but a small waft of smoke out the exhaust.