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Originally Posted by Frank
I like (and own several) old 2-strokes. They're horrendously dirty compared to modern 4-strokes but they don't get ridden that much so the guilt factor is pretty low.
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The problem had always been the oil, but nowadays it's been mostly solved due to the synthetic oils that can be used at a lower ratio, get better dilluted and then lead to a cleaner burn (they even decrease the spark plug fouling). There are always those Castor-based oils, renewable, biodegradable, and have a better dillution with the ethanol content currently added to the gasoline.
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If I understood correctly, KTM is bringing a direct-injected 2-stroke to market next year. 
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It's been rumored for a long time and still led to nothing.