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Well, it IS your bike, & one of the freedoms we still have is to put whatever the hell oil we want in our crankcase...
That said. the manual states pretty clearly that it is designed to use 10-40 or 15-50. It doesn't say 20-50 & I will bet you a case of oil that the 20-50 will not make your tranny one bit smoother. Miles will. Ride more. Repeat.
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insert clever saying here...
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