On my last bike I used Castrol GTD 10/40 with good results, now I've just got a Honda NTV 650 V twin water cooled almost the same as a Hawk / Bros, the gear shift was good untill I changed whatever oil was in there for the Castrol now its crap notchy and most of the time getting neutral on the way to second. Should I stick with 10/40 and go to another brand or go for 20/40