Honda Express nc50 1980 - transmission oil

Mike Rudko /
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I want to put the best oil in my bike as possible. It seems Royal Purple no longer just makes a plain 10W40 oil. They have Royal Purple 10W40 High Performance Street Motor Oil they also have Royal Purple Max Cycle 10W40 Oil for Motorcycles and ATVs which says is for 4 stroke engines. Does it make a differences? What do you guys use in your 2 stroke bikes?

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