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Big Bore Cylinder Kits - Offroad
Street kits click here
Honda click on pic Price
CRF450R all Athena 490cc BIG BORE KIT 100mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.

$699.95
CRF450X 05-07 Athena 490cc BIG BORE KIT 100mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets. Fits all years R and X models.

$679.95
TRX450R Athena 480cc BIG BORE KIT 97mm 2004-2005
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated 10.7:1 piston, Rings, Clips, Pin and gaskets dyno

$749.95
TRX450R Athena 100mm BIG BORE KIT 2006-2008
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$749.95
TRX400EX / XR400R
ProCycle 440cc BIG BORE 89mm KIT 1 With Cam
Complete kit with 12.5:1 Wiseco piston, rings, clips, pin, big bore cylinder sleeve, HotCams stage 3 camshaft and gaskets.

$469.95
TRX400EX / XR400R
ProCycle 440cc BIG BORE 89mm KIT 2 With Cam
Complete kit with 11:1 Wiseco piston, rings, clips, pin, big bore cylinder sleeve, HotCams stage 3 camshaft and gaskets.
$449.95
TRX400EX / XR400R
ProCycle 425cc BIG BORE 88mm KIT With Cam
Complete kit with 11:1 Wiseco piston, rings, clips, pin, HotCams stage 1 performance camshaft and gaskets. No re-sleeving required. You will have to have your cylinder bored to fit the larger piston.

$379.95
CRF250 Athena 280cc BIG BORE KIT 82mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated 13:1 high compression piston, Rings, Clips, Pin and gaskets. Fits all years R and X models.
$749.95
XR285 Big Bore Kit with cam
285cc big bore kit includes Wiseco piston, HotCams stage 1 camshaft and complete top end gasket set. This is a great combination and a big 'bang for the buck' performance increase. No re-sleeving required. You will have to have your cylinder bored to fit the larger piston.

$379.95
CRF150F 03-05 BBR BIG BORE 175cc KIT
High compression 10.75:1 piston, performance camshaft and valve springs
$317.95
CRF230F all BBR BIG BORE 240cc KIT
High compression piston, performance camshaft and valve springs
$349.95
CRF100 XR100 BBR CRF100 XR100 BBR 120cc Big Bore Kit
Complete with custom "big finned" BBR aluminum cylinder, piston, rings, piston pin, clips, BBR exclusive motocross grind performance camshaft, HD valve springs, rockers with tappet adjusters and gasket kit. Everything included for easy installation
$279.95
Yamaha
YZ450F 03-05 WR450 03-06 Athena 480cc BIG BORE KIT 98mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.

$699.95
YZ450F 06-08 Athena 480cc BIG BORE KIT 98mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$749.95
YFZ450 Athena 480cc BIG BORE KIT 98mm (ATV)  all years
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston with 12.4:1 compression, Rings, Clips, Pin and gaskets. NEW LOW PRICE

$499.95
YZ250F & WR250F Athena 290cc BIG BORE KIT 83mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated 12.5:1 piston, Rings, Clips, Pin and gaskets. dyno
$699.95
YZ125 05-06 Athena 144cc BIG BORE KIT 58mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Cylinder head & dome, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$699.95
TTR125 BBR BIG BORE 150cc KIT W/CAM
BBR aluminum cylinder with steel liner (bored, honed and ready to use) 58mm piston, pin, clips, and rings Includes head and base gasket. New (not reground) high-performance camshaft.
$369.95
TTR125 ProCycle BIG BORE 130cc KIT WITH CAM
Wiseco 55mm high compression 11:1 piston, rings, wrist pin, clips, HotCams performance camshaft and top end gasket set. This kit provides much of the performance gain of the more expensive 150 (143cc) kits. But gives better reliability due to the thicker wall of the cylinder sleeve. You will have to have your cylinder bored to fit the larger piston.
$289.95
Suzuki
LT-R450 Athena 493cc BIG BORE KIT 100mm NEW!
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.

$649.95
RMZ450 04-06 Athena 493cc BIG BORE KIT 100mm NEW!
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$699.95
DRZ KLX KFX LTZ 400 all
Athena 440cc BIG BORE KIT 94mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.

$699.95
RMZ250 07-08 Athena 290cc BIG BORE KIT 83mm NEW!
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$679.95
RMZ250 & KX250F up to 2006 Athena 290cc BIG BORE KIT 83mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$699.95
DR350 BIG BORE KIT 385cc 83mm
Includes forged Wiseco 83mm piston piston, Rings, Clips, Pin and top end gasket set.
$189.95
Kawasaki
KX450F 05-08 BIG BORE490cc 100mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets.
$679.95
KX125 03-06 BIG BORE 144cc 58mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets

 

$679.95
DRZ125 KLX125 ProCycle BIG BORE 150cc KIT WITH CAM
Complete with 61mm high compression Wiseco piston, rings, clips, pin, HotCams billet camshaft and big bore gasket set. You will have to have your cylinder bored to fit the larger piston.

 

$279.95
DRZ110 KLX110 BBR Big bore 143cc kit with Cam
Includes new aluminum cylinder, big bore piston, performance camshaft and gasket set. This is the biggest bore possible without boring out the engine cases.
$349.95
DRZ110 KLX110 BBR Big bore 130cc kit with Cam
Includes 57mm piston, performance camshaft and gasket set.
You will have to have your cylinder bored to fit the larger piston.
$259.95
KX65 06-07 BIG BORE 82cc 50mm
Complete bolt-on cylinder kit. Includes complete new Athena nickel-carbide plated cylinder, Forged & Coated piston, Rings, Clips, Pin and gaskets

 

$559.95
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