i have a 1990 sp and it is leaking oil from somewhere. i am not sure whether it is from the gearbox as the level always remains constant, or from the carbs since it has been converted to pre mix. (thinking that a carb or fuel hose may be loose). it always leaks on to oe exhaust chamber and have not been able to follow it. any help would be appreciated.

Check the exhaust gaskets (NSR`s have a tendency to leak from there).
Also check the compression washer on the tranny drain bolt.
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Mike