Rockoil told us that Synthesis 2 Injector is actually a better oil for the NSR; either injected or pre-mixed.
I can't remember off-hand why they recommended it over Castor Kart 100 though, other than Synthesis 2 mixes with any other synthetic or semi-synthetic. I seem to recall though that Castor Kart was designed to be used with leaded fuel, in steel lined bores, at very high RPM. I'd bet the customary 50p that any fully synthetic these days is better than any castor based oil... other than the smell! Mind you, if you're getting it cheaper than fully-syn, and the motor's not failing on you, then that's ideal!
NSR-WORLD.COM/Rockoil
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Andy.
NSR-WORLD.COM
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