Domestic Lower 48 States Shipping
Orders up to $50.00 - $7.50
$50.01 to $150.00 - $12.50
$150.01 and up - $17.50
Alaska, Hawaii, Other U.S. Territories Shipping
Orders up to $50.00 - $15.00
$50.01 to $150.00 - $25.00
$150.01 and up - $35.00
International Shipping
Orders under $199.00 - $28.50
Orders over $199.00 - $38.00
Athena Four Stroke Big Bore Kits
Cylinder Kits
Kits
include aluminum cylinder with a galvanic coating designed with larger
water jackets for better cooling and a forged piston with molybdenum
coating for the best in performance. Each kit also contains a special
gasket and easy to follow step by step instructions. No machining is
required.
"Race" Cylinder Kits
Kits
include aluminum cylinder with a nickel carbide coating. Hard anodized
power valves are also included (cannot use stock). Forged OE Style
domed piston kit. Athena top end gasket kit with all required seals and
easy to follow step by step instructions.
"Works" Cylinder Kits
Kits
include aluminum cylinder with a nickel carbide coating and ported to
factory works specs! The aluminum cylinder head has a removable bronze
dome allowing for higher compression and anti detonation features.
Specially designed, high performance, hard anodized power valves are
also included (cannot use stock) and cast lite flat top piston kit.
Athena then tops off the kit with a top end gasket kit and all required
seals with easy to follow instructions.
Honda 4 Stroke Dirt Bike Big Bore Cylinder Kits 
CRF150R 2007-10 Stock Bore Cylinder Kit 11.4 to 1 $393.95 *Exchange your old cylinder for a $50.00 refund!
11.4 to 1 Piston Kit $153.95
Top End Gasket Kit $44.48
Replacement Ring Set $35.95 CRF150R 2007-10 69mm Big Bore Cylinder Kit $499.95 *Exchange your old cylinder for a $50.00 refund!
69mm 11.4 to 1 Piston Kit $200.00
Top End Gasket Kit $44.48
Replacement Ring Set $42.79
CRF250R/X 2004-09 82mm Big Bore Cylinder Kit $891.95 *Exchange your old cylinder for a $50.00 refund!
Forged 82mm 13.1 to 1 Piston Kit $209.95
Top End Gasket Kit $72.95
Replacement Ring Set $35.95 CRF450R 2002-08 Works Stock Bore Cylinder Kit $791.95 *Exchange your old cylinder for a $50.00 refund!
Forged 11.5 to 1 Piston Kit $196.95
Top End Gasket Kit $103.95
Replacement Ring Set $33.95 CRF450R 2002-08 100mm Big Bore Cylinder Kit $836.95 *Exchange your old cylinder for a $50.00 refund!
Forged 100mm 11.6 to 1 Piston Kit $209.95
Top End Gasket Kit $103.95
Replacement Ring Set $33.95 CRF450X 2005-09 100mm Big Bore Cylinder Kit $839.95 *Exchange your old cylinder for a $50.00 refund!
Forged 100mm 11.6 to 1 Piston Kit $209.95
Top End Gasket Kit $76.53
Replacement Ring Set $35.95 CRF450R 2009-10 100mm Big Bore Cylinder Kit $839.95 *Exchange your old cylinder for a $50.00 refund!
Forged 100mm 11.6 to 1 Piston Kit $209.95
Honda 4 Stroke ATV Big Bore Cylinder Kits 
TRX450R 2004-05 480cc Big Bore Cylinder Kit $909.95 *Exchange your old cylinder for a $50.00 refund!
10.7 to 1 Complete Piston Kit $209.95
Top End Gasket Kit $112.95
Replacement Ring Set $35.95
TRX450R 2006-09 490cc Big Bore Cylinder Kit $909.95 *Exchange your old cylinder for a $50.00 refund!
12.0 to 1 Complete Piston Kit $209.95
Top End Gasket Kit $112.95
Replacement Ring Set $33.95
Husqvarna 4 Stroke Dirt Bike Big Bore Cylinder Kits 
250 TC/TX 2006-07 83mm Big Bore/300cc Cylinder Kit $798.95 *Exchange your old cylinder for a $50.00 refund!
Piston Kit $210.95
Top End Gasket Kit $74.95
Replacement Ring Set $33.95 250 TC/TE 2003-05 83mm Big Bore/300cc Cylinder Kit $798.95 *Exchange your old cylinder for a $50.00 refund!
Piston Kit $210.95
Top End Gasket Kit $74.95
Replacement Ring Set $33.95
250 TC/TE 2006-07 83mm Big Bore/300cc Cylinder Kit $798.95 *Exchange your old cylinder for a $50.00 refund!
Piston Kit $210.95
Top End Gasket Kit $74.95
Replacement Ring Set $33.95
250 TC/TE 2008-09 83mm Big Bore/300cc Cylinder Kit $798.95 *Exchange your old cylinder for a $50.00 refund!
Piston Kit $210.95
Top End Gasket Kit $74.95
Replacement Ring Set $33.95
Kawasaki 4 Stroke ATV Big Bore Cylinder Kits 
KFX400 2003-06 435cc Big Bore Cylinder Kit $800.95 *Exchange your old cylinder for a $50.00 refund!
12.3 to 1 Complete Piston Kit $217.95
Top End Gasket Kit $96.95
Replacement Ring Set $33.95
KFX450R 2008-09 490cc Big Bore Cylinder Kit $999.95 *Exchange your old cylinder for a $50.00 refund!
12.7 to 1 Complete Piston Kit $209.95
Top End Gasket Kit $63.95
Replacement Ring Set $33.95
Kawasaki 4 Stroke Dirt Bike Big Bore Kits 
KLX110 2005-09 57mm Big Bore/130cc Big Bore Kit $419.95 *Exchange your old cylinder for a $50.00 refund!
Forged Piston Kit $93.95
Top End Gasket Kit $32.95
Replacement Ring Set $16.95
KTM 4 Stroke Dirt Bike Big Bore Kits 
250SX-F 2006-10 80mm Big Bore/280cc Big Bore Kit $729.95 *Exchange your old cylinder for a $50.00 Refund!
Piston Kit *contact us for price and availability
Top End Gasket Kit $45.95
Replacement Ring Set *contact us for price and availability
Suzuki 4 Stroke ATV Big Bore Cylinder Kits 
LT-Z400 2003-08 435cc Big Bore Cylinder Kit $800.95 *Exchange your old cylinder for a $50.00 refund!
12.3 to 1 Complete Piston Kit $217.95
Top End Gasket Kit $96.95
Replacement Ring Set $33.95
LT-ZR450 2006-07 490cc Big Bore Cylinder Kit $793.95 *Exchange your old cylinder for a $50.00 refund!
13.3 to 1 Complete Piston Kit $217.95
Top End Gasket Kit $62.95
Replacement Ring Set $33.95
Yamaha 4 Stroke ATV Big Bore Cylinder Kits 
YFZ450 2004-08 478cc Big Bore Cylinder Kit $859.95 *Exchange your old cylinder for a $50.00 refund!
12.0 to 1 Complete Piston Kit $209.95
Top End Gasket Kit $85.95
Replacement Ring Set $37.95
Yamaha 4 Stroke Dirt Bike Big Bore Cylinder Kits 
YZ250F 2001-07 83mm Big Bore/290cc Big Bore Kit $818.95 *Exchange your old cylinder for a $50.00 refund!
WR250F 2001-09 Forged Piston Kit $209.95
Top End Gasket Kit $63.95
Replacement Ring Set $28.95
YZ250F 2008-10 83mm Big Bore/290cc Big Bore Kit $856.95 *Exchange your old cylinder for a $50.00 refund!
Forged Piston Kit $228.95
Top End Gasket Kit $63.95
Replacement Ring Set $28.95
WR250 R/X 2008-10 83mm Big Bore/290cc Big Bore Kit $959.95 *Exchange your old cylinder for a $50.00 refund!
Forged Piston Kit $240.95
Top End Gasket Kit $68.95
Replacement Ring Set $28.95
YZ450F 2003-05 98mm Big Bore/478cc Big Bore Kit $854.95 *Exchange your old cylinder for a $50.00 refund!
WR450F 2003-10 Forged Piston Kit $209.95
Top End Gasket Kit $85.95
Replacement Ring Set $35.70
YZ450F 2006-09 98mm Big Bore/480cc Big Bore Kit $854.95 *Exchange your old cylinder for a $50.00 refund!
WR450F 2007-10 Forged Piston Kit $209.95
Top End Gasket Kit $85.95
Replacement Ring Set $35.70