being that these are two stroke bikes, and need to be rebuilt every once in a while, what's the story on parts for the rebuilds?

are there still NOS parts from honda, or has it been reduced to sourcing "less worn" used pieces? Any aftermarketters step up and start selling repro pieces yet?

with average use, what's the lifespan on a stock engine? 20,000km?

thx!
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n00b