In the process of converting my TY175 from autolube to premix I have had differing advice on pre mix ratio. Suggestions ranging from 40:1 to 70:1. It will be used in twin shock trials so mostly slow speed work in 1st and 2nd gear. I will run it on a synthetic oil (Castrol TT). I would like to know what ratio others have used and for how long? I'd like to avoid it blowing up but also would like to avoid it oiling up. Any advice/opinion/debate etc. greatly appreciated. Cheers.