engines remained unchanged for most of their life. solid, simple, bulletproof technology. I'm restoring an 89 20cc and i just bought a new in crate 2005 Yamaha 115 2 stroke. I was ready to pull the trigger on a Zuke 140, but this 115 came long and im stoked about it.
I think most say the performance on a 20 is adequate although not a speed demon. I don't think anyone will have any negatives to say about that engine.
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