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PhatheadRacing

Yamaha YZ250 combustion chambers

Chamber Selection
Regular price $80.00 USD
Regular price Sale price $80.00 USD
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Chamber selection:


1999-2022


Y20 - 22cc Stock compression for the X model 

Y21 - 21.1cc Stock (95+ octane)

Y22 - 20.1cc (100+ octane)

Y23 - 19.1cc (105+ octane)


1999-2022 big bore chambers:


YZ295 - 72mm 93 octane - Revised squish clearance .055"

 


 

1988-1998

Y30 - stock

Y31 - (95+ octane)
Y32 -  (100+ octane)
Y33 -  (105+ octane)