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whipit1k

WR400 high compression pistons?

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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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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.

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

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