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30mm 1.75:1 taper? Please explain?If you mean 1.75:10 then that still does'nt match mine.The small end start is 27mm diam on both tapers in pic.At 1:10,it is 30mm diam at 30mm in from the front small end.That works,as 1mm rise per 10 mm length-27+3=30Mine is 27mm start also,but finishes at 31mm diam at 30mm in,mine has risen 4mm over 30mm dist.So mine is more like 1.33:10 taper to finish with 31mm diam at 30 in..That make sense?Where would I find some specs on the Rotax tapers?