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Posted (edited)

You guys who like the sound of 20,000 rpm bikes will like this.  These would be perfect for the kids in Thailand to race around late at night. 

 

42 HP @ 17,000rpm Yamaha 125 cc 4-banger ... 50cc Suzuki water cooled triple, 19 hp @ 20,000 rpm. Etc.

 

 

 

Edited by Damrongsak
Posted

It got to the point where internal friction and mechanical losses started to overtake the gains. Even the 2-strokes were complex. Yamaha made some crazy engines.

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