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YZ250 325 BIG BORE KIT
yz250 1999 2000 2001 2002 2003 2004 yz250 top end rebuild kit yz250 cylinder yz 250 big bore kit yz250 big bore kit 2 stroke big bore kit yz250 yz250 big bore kits yamaha yz 250 cylinder yz 250 engine yz 250 piston


 
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List Price: $899.00
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GAS


HEAD COLOR YAM


PORT DESIGN



TOP BEARING:

Qty:
Description
 
In house castings should be available around 9/15/2023. The E2B will be the first in house cylinder casting
Bolt on no bottom end work needed none at all
COMPLETE KIT NEW CYLINDER, PISTON,HEAD,GASKETS AND POWER VALVE
VERY SIMPLE TO BOLT ON LIKE CHANGING PISTON
800 YZ325
Features
  • PLEASE READ
    SHOP CELL 805-440-1063 OR TEXT TO THIS PHONE TO GET A CALL BACK
    FITS YAMAHA YZ250 1999 TO 2021 YEARS AND X MODEL

    NO CASE WORK NEEDED WILL BOLT ON
    STOCK CARBURETOR WORKS GOOD
    STOCK PIPE OR AFTERMARKET IS FINE
    STOCK REED AND AFTER MARKET IS FINE

    THIS KIT COMES WITH THE CYLINDER, HEAD, PISTON, POWER VALVE ,AND GASKETS 75.5MM .HAS GREAT POWER AND SMOOTH POWER .THE POWER IS VERY EASY TO CONTROL THE POWER VALVE OPENS A LITTLE LATER TO MAKE IT EASY TO RIDE ON A SLICK TRACKS . THE POWER VALVE IS ADJUSTABLE IT HAS A BOLT TO ADD SPRING PRESSURE TO MAKE THE POWER VALVE OPEN LATER OR SCREW OUT TO OPEN SOONER THE PISTON SIZE IS 75.5 WITH 4 OVER SIZES AVAILABLE.

    Recommended jetting
    162/168 main
    stock needle
    stock low speed
    https://www.youtube.com/watch?v=q-1dUVEnKog

    http://youtu.be/ijKMclEPj9o

    EMAIL FOR QUESTIONS [email protected]

    Porting S8 SMOTHER AND MORE POWER THAN STOCK

    KIT INCLUDES

    NEW CYLINDER (NO EXCHANGE)
    NEW HEAD PUMP FUEL OR RACE FUEL
    PISTON RINGS PIN CLIPS (NO BEARING USES OEM YAMAHA)
    POWER VALVE
    BASE REED GASKET
    HEAD O RINGS SET
    CYLINDER, HEAD NUTS AND WASHERS

    INSTALLATION IS JUST LIKE DOING A TOP END REBUILD
    HEAD TORQUE 18 LBS
    CYLINDER BASE 35 LBS
    STANDARD POWER VALVE SETTING 5MM OF THREADS SHOWING
    HOSE ON POWER VALVE IS A VENT JUST RUN IT DOWN
    RING END GAP IS PRESET


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