I have been using Rock Oil Castor in the NSR for a few sessions now, and it seems to be working ok.

I always seem to end up with fuel vapour blowing back out through the carb, so guess it does coat the slides nicely. It's a bit higher maintenance though, must drain the carbs and tank after every meet otherwise it can gum bits up.
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More **** two strokes than you can shake a **** stick at.