WR400 high compression pistons?

2 replies to this topic
  • whipit1k

Posted May 28, 2005 - 06:37 PM


It is getting to be time to freshen the top end on my 2000 wr400 and I am thinking of maybe getting a slightly higher compression piston. Has anyone got a high compression top end in their WR? what is the hot setup? It is a stock WR , other than all of the free mods

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  • Dan_from_HB

Posted May 29, 2005 - 01:32 PM


I'll be doing mine this summer, but no changes for me. Compression is high enough as it is. Reliability can only deteriorate with additional mods.
Yamaha Engineers spend countless hours in R&D. These engines have such a good mix of performance and reliability, I will trust them and keep mine stock.

  • 1rkcooper

Posted May 29, 2005 - 09:53 PM


I just looked in the manual, the stock compression ratio is 12.5 : 1 on my 98 wr400.


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