Big Bore kits from ProCycle

Big Bore Cylinder Kits - Offroad Street kits click here
Honda	click on pic	Price	Enter Qty
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. 09310014	pic	$639.95
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. 09310103	pic	$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 09310028 dyno		$699.95
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. 68-4740		$799.95
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. trx440kit1		$369.95
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. trx440kit2		$349.95
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. trx425kit		$289.95
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. 68-4730		$699.95
CRF150F 03-05 BBR BIG BORE 175cc KIT High compression 10.75:1 piston, performance camshaft and valve springs 80-9994		$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 0903-0112		$359.95
XR50 / CRF50 BBR SUPER-PRO 88cc BIG BORE KIT Complete kit includes: Cylinder, Big valve head, 18mm Carb, Performance camshaft, Intake, Throttle, Billet cam cover, High volume oil pump. 80-9930	pic	$906.95
XR50 / CRF50 BBR SUPER-PRO 110cc STROKER/BORE KIT Complete kit includes: Cylinder, Big valve head, 24mm Carb, Stroker crank, Performance camshaft, Intake, Throttle, Billet cam cover, High volume oil pump. 80-9940	pic	$1179.95
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. 09310020		$659.95
YZ450F 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. 68-4990		$719.95
YFZ450 Athena 480cc BIG BORE KIT 98mm (ATV) 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. 09310022	pic	$659.95
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. 09310024	dyno	$639.95
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. 68-4930		$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. New cylinder is plain aluminum not gold as shown in photo. 80-9991		$399.95
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. more info		$269.95
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. 0931-0116	pic	$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. 68-4430	pic	$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. 09310016	pic	$629.95
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. 09310112	pic	$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. 09310026	pic	$639.95
Kawasaki
KX450F BIG BORE 490cc 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 09310109	pic	$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. drz150kit	pic	$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. 80-9400		$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. 80-9939+80-9936		$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 09310107	pic	$559.95