check the 2005 kingquad 700 compression ratio 10.0.1 highest of any 4x4 and higher than all sport quads exept the new 450 from honda and yamaha. this is where the industry is going. brutally fast and powerfull big bore 4x4. and it is only the beginning. it is the most lucrative segment and that is the reason why it will evolve beyond comprehension the same way the pickup truck market is the most lucrative segment in the automobile industry. sport quads? slowly evolving.

 

I think the Vinson is 10.3 : 1

Am I right Vinson581?

 

The z400 is something like 11.2:1

 

The mojave is around 10.5:1.