Cylinder Works Big Bore KitsBig Bore Kits come complete with gaskets, cylinder, and piston kit.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
Honda 4 Stroke ATV Big Bore Cylinder Kits 
TRX450R 2004-05 479cc 97mm Big Bore Cylinder Kit 10.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Vertex Big Bore Replacement Piston 10.5 to1 96.96mm $235.80
Vertex Big Bore Replacement Piston 10.5 to1 96.97mm $235.80 Vertex Big Bore Replacement Piston 10.5 to1 96.98mm $235.80 TRX450R 2006-09 477cc 99mm Big Bore Cylinder Kit 12.0 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
TRX 450ER 2006-09 Big Bore Gasket Kit $69.95
Vertex Big Bore Replacement Piston 10.5 to1 98.96mm $235.80
Vertex Big Bore Replacement Piston 10.5 to1 98.97mm $235.80 Vertex Big Bore Replacement Piston 10.5 to1 98.98mm $235.80
Honda 4 Stroke Dirt Bike Big Bore Cylinder Kits 
CRF150R 2007-09 68mm Big Bore Cylinder Kit 11.7 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
CRF250R 2004-09 81mm Big Bore Cylinder Kit 13.0 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
CRF250X 2004-09 Big Bore Gasket Kit $69.95 **Case Boring required
CRF250R 2004-09 79mm Big Bore Cylinder Kit 13.0 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
CRF250X 2004-09 Big Bore Gasket Kit $69.95
CRF450R 2002-08 100mm Big Bore Cylinder Kit 12.1 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
CRF450X 2005-08 100mm Big Bore Cylinder Kit 12.1 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
CRF450R 2009- 99mm Big Bore Cylinder Kit 12.0 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
CRF450X 2009- 99mm Big Bore Cylinder Kit 12.1 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Kawasaki 4 Stroke Dirt Bike Big Bore Cylinder Kits 
KX250F 2004-08 80mm Big Bore Cylinder Kit 12.6 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
KX250F 2009- 80mm Big Bore Cylinder Kit 13.2 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
KLX400 2003-04 434cc 94mm Big Bore Cylinder Kit 11.3 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Suzuki 4 Stroke ATV Big Bore Cylinder Kits 
LTZ400 2003-09 434cc 94mm Big Bore Cylinder Kit 11.3 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
KFX400 2003-05 Big Bore Gasket Kit $69.95
DVX400 2004-07 Vertex Big Bore Replacement Piston 11.3 to1 93.95mm $188.99
Vertex Big Bore Replacement Piston 11.3 to1 93.96mm $188.99 Vertex Big Bore Replacement Piston 11.3 to1 93.97mm $188.99
LT450R 2006-09 474cc 98mm Big Bore Cylinder Kit 11.7 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Vertex Big Bore Replacement Piston 11.7 to1 97.96mm $215.80
Vertex Big Bore Replacement Piston 11.7 to1 97.97mm $215.80
Vertex Big Bore Replacement Piston 11.7 to1 97.98mm $215.80
Suzuki 4 Stroke Dirt Bike Big Bore Cylinder Kits 
RM-Z250 2004-06 80mm Big Bore Cylinder Kit 12.6 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
DRZ400 2000-08 94mm Big Bore Cylinder Kit 11.3 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Yamaha 4 Stroke ATV Big Bore Cylinder Kits 
YFZ450 2004-09 478cc 98mm Big Bore Cylinder Kit 12.0 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Vertex Big Bore Replacement Piston 12.0 to1 97.95mm $215.80
Vertex Big Bore Replacement Piston 12.0 to1 97.96mm $215.80
Vertex Big Bore Replacement Piston 12.0 to1 97.97mm $215.80
YFM700R Raptor 2006-08 105mm Big Bore Cylinder Kit 9.2 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
Rhino 700 105mm Big Bore Cylinder Kit 9.2 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Grizzly 700 Big Bore Gasket Kit $69.95
Yamaha 4 Stroke Dirt Bike Big Bore Cylinder Kits 
YZ250F 2001-04 80mm Big Bore Cylinder Kit 12.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!WR250F 2001-04 Big Bore Gasket Kit $69.95
YZ250F 2005-07 80mm Big Bore Cylinder Kit 12.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
WR250F 2005-06 Big Bore Gasket Kit $69.95
YZ250F 2008-09 80mm Big Bore Cylinder Kit 12.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
YZ450F 2003-05 98mm Big Bore Cylinder Kit 12.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95
YZ450F 2006-09 98mm Big Bore Cylinder Kit 12.5 to 1 $599.95 *Exchange your old cylinder for a $50.00 refund!
Big Bore Gasket Kit $69.95