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Athena Big Bore kits
CR Big Bore
KTM Big Bore
KX/KDX Big Bore
RM Big Bore
YZ Big Bore
CRF Big Bore
KTM-F Big Bore
KXF Big Bore
RMZ Big Bore
YZF Big Bore
 
Big Bore kits for Yamaha 4-Strokes  

Also available

Intake & Exhaust Valves - Spring kits - Valve Guides - Valve Seals - Cam chain


LA Sleeve Big Bore Cylinder kits use "Cylinder Works" cylinders, "JE" - "Wiseco" - "CP" forged piston kits and "Hot cams" camshafts


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LA Sleeve Big Bore kits

Unless otherwise specified

Big Bore kit Includes:

Sleeve, Piston kit, Stage II Hot Cam & Gasket kit   


 

YZ250F,WR250F 01-04

(80mm) 270cc Big Bore kit  13:1

(includes cylinder)

# CK5536-1  $699.00


 

YZ250F 05-10

(80mm)  270cc Big Bore kit  13:1

# LAS5536  $369.00


 

YZ250F 05-10

(80mm)  270cc Big Bore kit  13:1

(includes cylinder)

# CK5536  $699.00


 

YZ450F 03-05, WR450F 03-06

(98mm)  478cc Big Bore kit  13.5:1

(includes cylinder)

# CK5495  $895.00


 

YZ450F 06-09, WR450F 07-10

(98mm) 478cc Big Bore kit  13.5:1

(includes cylinder)

# CK5627  $895.00



Intake & Exhaust Valves

(Ti) Titanium - (St) Steel - (SS) Stainless Steel

Wiseco - Kibblewhite



YZ250F 01-07

Wiseco Ti  In Valve  # VIT005  $139.80 ea

Kibblewhite SS  In Valve  # 80-80073  $40.95

 

Wiseco Ti  Ex Valve  # VET005  $151.75 ea

Kibblewhite SS  Ex Valve  # 80-80075  $40.95

 

Wiseco Ti  Ce Valve  # VIT005C  $139.80 ea

Kibblewhite SS  Ce Valve  # 80-80077  $40.95


 

YZ400F/426F 98-00

Wiseco St  In Valve  # VIS006  $12.75 ea

Kibblewhite SS  In Valve  # 80-8055H  $40.95

 

Wiseco St  Ex Valve  # VES006  $16.75 ea

Kibblewhite SS  Ex Valve  # 80-8056H  $40.95

 

Wiseco St  Ce Valve  # VIS006C  $12.75 ea

Kibblewhite SS  Ce Valve  # 80-8057H  $40.95


 

YZ426F 01-02

Wiseco Ti  In Valve  # VIT007  $151.75 ea

Kibblewhite SS  In Valve  # 80-8055H  $40.95

 

Wiseco Ti  Ex Valve  # VET007  $151.75 ea

Kibblewhite SS  Ex Valve  # 80-8056H  $40.95

 

Wiseco Ti  Ce Valve  # VIT007C  $151.75 ea

Kibblewhite SS  Ce Valve  # 80-8057H  $40.95


 

YZ450F 03-09

Wiseco Ti  In Valve  # VIT008  $151.75 ea

Kibblewhite SS  In Valve  # 80-80213H  $40.95

 

Wiseco Ti  Ex Valve  # VET008  $151.75 ea

Kibblewhite SS  Ex Valve  # 80-80215H  $40.95

 

Wiseco Ti  Ce Valve  # VIT008C  $151.75 ea

Kibblewhite SS  Ce Valve  # 80-80217H  $40.95


 

YZ450F 10-11

Kibblewhite SS  In Valve  # 80-80762  $34.95

 

Kibblewhite SS  Ex Valve  # 80-80763  $34.95

 

Kibblewhite SS  Ce Valve  # 80-80766  $34.95

 



Valve Seals

Kibblewhite



YZ250F 01-07

In Valve Seal (3 pk) # 80-80079  $16.95

Ex Valve Seal (2 pk) # 80-80072  $11.95

 


 

YZ400F/426F 98-02

In Valve Seal (3 pk) # 80-80107  $16.95

 

Ex Valve Seal (2 pk) # 80-80108  $11.95


  

YZ450F 03-09

In Valve Seal (3 pk) # 80-80211  $16.95

 

Ex Valve Seal (2 pk) # 80-80212  $11.95

 

 

 

 

 

 

 

 

 

 

 

 



Cam Chains

Wiseco - Pro X - Magnum



YZ250F 01-07 

Wiseco # CC007  $39.95

Pro X # 31-2402  $61.38

Magnum # 280-0007  $39.95


 

YZ400F/426F 98-02 

Wiseco # CC008  $57.76

Pro X # 31-2419  $64.55

Magnum # 280-0008  $39.95


 

YZ450F 03-09

Wiseco # CC019  $65.95

Pro X # 31-4406  $78.86

Magnum # 280-0019  $39.95


 

YZ450F 10-11 

Wiseco # CC022  $68.95

Pro X # 31-4409  $78.86

Magnum # 280-0022  $39.95

 

 



     Replacement Piston



  • New replacement Big Bore Piston kits
  • Comes with rings, pin & clips
  • Forged and High compression ratio
  • Fits LA Sleeve Big Bore kits 

 

YZ250F 05-10

270cc (80mm) Piston kit # 247940  $194.95

 



     Replacement Piston



  • New replacement Big Bore Piston kits
  • Comes with rings, pin & clips
  • Forged and 13.5:1 compression ratio
  • Fits LA Sleeve Big Bore kits 

 

YZ450F 03-08

478cc (98mm) Piston kit # CPM1051  $224.95

 


Athena Big Bore kits 

Unless otherwise specified

Big Bore kit Includes:

Cylinder, Piston kit & Gasket kit


 

YZ250F 01-07, WR250F 01-09

(83mm)  290cc Big Bore kit  12.5:1

# P4004-8510-0012  $818.95

 


 

YZ250F 08-10

(83mm) 290cc Big Bore kit  12.5:1

# P4004-8510-0026  $856.95       

 


 

WR250 R/X 08-10

(83mm) 290cc Big Bore kit  12.5:1

# P4004-8510-0032  $959.95       

 


 

YZ450F 03-05, WR450F 03-06  

(98mm)  478cc Big Bore kit  12.5:1

# P4004-8510-0014  $854.95

 


 

YZ450F 06-09, WR450F 07-10

(98mm)  478cc Big Bore kit  12.5:1

# P4004-8510-0021  $854.95  

 




Valve Spring kits

Kibblewhite



YZ250F 01-07

Spring kit # 80-80066  $239.95

 


 

YZ400F/426F 98-02

Spring kit # 80-80100  $239.95

 


 

YZ450F 03-09

Spring kit # 80-80206  $249.95

 


 

YZ450F 10-11

Spring kit # 80-80750  $229.95

   



Valve Guides

Kibblewhite



YZ250F 01-07

In Valve Guide # 80-80080  $15.95 ea

Ex Valve Guide # 80-80090  $15.95 ea


 

YZ400F/426F 98-02

In Valve Guide # 80-80110  $15.95 ea

 

Ex Valve Guide # 80-80120  $15.95 ea

 


 

YZ450F 03-09

In Valve Guide # 80-80220  $15.95 ea

 

Ex Valve Guide # 80-80230  $15.95 ea

 


 

YZ450F 10-11

In Valve Guide # 80-80770  $15.95 ea

 

Ex Valve Guide # 80-80780  $15.95 ea

   



    Replacement Cylinder



 

  • New replacement Big Bore Cylinder

  • Cylinder Works cylinders look like stock

  • Nickel-Silicon-Carbide Plated bore
  • Bore is honed to exact stock bore size
  • Fits LA Sleeve BB Cylinder kits 

 

YZ250F 01-10

Nikasil Bore 270cc Cylinder # 21002  $275.95

 

YZ450F 04-09

Nikasil Bore 478cc Cylinder # 21001  $269.95