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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 Kawasaki 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" 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 


 

KX250F 2004-05 (80mm) 270cc Big Bore kit 

# LAS-5530B  $685.00  

 


 

KX250F 2004-05 (80mm) 270cc Big Bore kit 12.5:1

(Includes new Sleeved Cylinder)

# CK5530  $799.00 

 


 

KX250F 2006-09 (80mm) 270cc Big Bore kit

# LAS-5611B $685.00  

 


 

KX250F 2006-09 (80mm) 270cc Big Bore kit 12.5:1

(Includes new Sleeved Cylinder)

# CK5611  $799.00 

 




Intake & Exhaust Valves

Wiseco - Kibblewhite 

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



KX250F 04-08

(Wiseco Titanium)

Ti In valve  # VIT011  $125.75 ea

Ti Ex valve  # VET011  $125.75 ea

 

(Kibblewhite Stainless Steel)

SS In valve  # 40-40140  $39.95 ea

SS Ex valve  # 40-40143  $39.95 ea


KX250F 09-10

(Wiseco Titanium)

Ti In valve  # VIT033  $125.75 ea

Ti Ex valve  # VET011  $125.75 ea

 


KX450F 06-08

(Wiseco Titanium)

Ti In valve  # VIT012  $139.75 ea

Ti Ex valve  # VET012  $139.75 ea

 

(Kibblewhite Stainless Steel)

SS In valve  # 40-40312  $39.95 ea

SS Ex valve  # 40-40316  $39.95 ea

  


KX450F 09-10

(Wiseco Titanium)

Ti In valve  # VIT034  $139.75 ea

Ti Ex valve  # VET034  $139.75 ea

 



Valve Seals

 Kibblewhite



KX250F 04-09

In or Ex # 700-100014  $5.95 ea


KX450F 06-08

In or Ex # 700-100016  $5.95 ea

 

 

 

 

 

 

 

 

 

 



Cam Chains

Wiseco - Pro X - Magnum



KX250F 04-11

Wiseco # CC007  $39.95

Pro X # 31-2402  $61.38

Magnum # 280-0007  $39.95


KX450F 06-08

Wiseco # CC019  $65.95

Pro X # 31-4406  $78.86

Magnum # 280-0019  $39.95


KX450F 09-11

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 with 12.5:1 compression ratio
  • Optional 81mm Piston kit available
  • Fits LA Sleeve KX250F Big Bore kits 

 

KX250F 04-09

270cc (80mm) Piston kit # 247598  $199.75

 

 


Athena Big Bore kits

Unless otherwise specified

Big Bore kit Includes:

Cylinder, Piston kit & Gasket kit 


 

KX250F 04-08  (83mm) 290cc Big Bore kit  12.5:1

# P4005-1010-0004  $818.95

 


 

KX250F  2009  (83mm) 290cc Big Bore kit  13.5:1

# P4002-5010-0013  $818.95

 


 

KX450F 06-07, KLX450R 08-10  490cc Big Bore kit

# P4002-5010-0003  $846.95       (100mm) 12.2:1

 


KX450F 08-09  (100mm) 490cc Big Bore kit  12.2:1

# 162-08K450-1  $846.95

 


 


Valve Spring kits

 Kibblewhite



KX250F 04-09

# 60-174K  $229.95


KX450F 06-08

# 40-40300  $229.95

 

 



Valve Guides

 Kibblewhite



KX250F 04-09

In or Ex guide # 40-40120  $15.95 ea

 


KX450F 06-08

In or Ex guide # 40-40320  $15.95 ea

 



    Replacement Cylinder



 

  • New replacement Cylinder for BB 270cc
  • Cylinder Works cylinders look like stock
  • Nickel-Silicon-Carbide Plated bore
  • Bore is honed to exact stock bore size
  • Fits LA Sleeve kits CK5530 & CK5611 

 

KX250F 04-09

Nikasil Bore 270cc Cylinder # 31001  $269.95