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Top End & Big Bore Kits There are 41 products.
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$ 255.00 In stock88cc Stage 2 Big Bore Kit for Honda XR70 and CRF70
50 Caliber Racing Big Bore Kits are top quality and come with everything you need to finish the job. This is a great way to pump up your Honda XR70 or CRF70. This kit will easily double the stock horsepower on your bike. We recommend installing a high volume oil pump with this kit.
$ 255.00 -
$ 155.00 In stock88cc Stage 1 Big Bore Kit for Honda for Z50, XR50, CRF50
50 Caliber Racing Stage 1 Big Bore Kits are top quality and come with everything you need to finish the job. This is a great way to pump up your Honda Z50, XR50 or CRF50. This kit is recommended for those who don't want to spend a fortune but still want to see a nice power increase over the stock engine. It can be installed by anyone with basic mechanical...
$ 155.00 -
$ 255.00 In stock88cc Stage 2 Big Bore Kit for Honda Z, XR, and CRF 50's
50 Caliber Racing Stage 2 Big Bore Kits are top quality and come with everything you need to finish the job. This is a great way to pump up your Honda Z50, XR50 or CRF50. This kit is recommended for those who don't want to spend a fortune but still want to see a nice power increase over the stock engine. It can be installed by anyone with basic mechanical...
$ 255.00 -
$ 59.00 Product available with different options50 Caliber Racing Backpack with Harness Straps
Carry your stuff in style and comfort. Heavy gauge canvas material with 2" wide padded straps and embroidered 50 Caliber Racing logo. Multiple compartments to keep your things organized. Featuring a padded laptop compartment, and two drink holders: one on each side. Use it for school, gym, bug out bag, target shooting, travel, and more. This bag is heavy...
$ 59.00 -
$ 395.00 Out of stock88cc Vintage Big Bore Kit with Race Head Honda Z50, CT70, ATC70 68-81
88cc Race head big bore kit for your vintage Honda pit bike. Complete with a 52mm piston and cylinder, fully assembled race head with 25/22mm valves and revised chamber. 20mm carburetor with intake, filter and cable. High performance camshaft. Full gasket kit. Everything necessary to fulfill your need for speed! - Z50A (1968-1978) - CT70 (1969-1982) -...
$ 395.00 -
$ 74.00 Out of stockSuzuki LT50 Top End Rebuild Kit
50 Caliber Racing complete replacement top end kit for Suzuki LT50 Engines. Stock bore and piston size. Lightweight aluminum cylinder with a steel sleeve. Oversized cooling fins on cylinder for efficient heat dissipation. 90 day warranty. Fits Suzuki LT50 (1984-1987).
$ 74.00 -
$ 399.00 In stock88cc Big Bore Kit with Race Head - Honda Z50, CRF50, XR70 & CRF70
50 Caliber Racing 88cc Race head kit for Your Honda 50 or 70cc pit bike. This kit will drastically improve your overall performance on your bike. A stock honda 50 puts around 2.2hp to the ground and this kit will put you between 5.5-6hp to the ground and 30% more to the crank! Kit comes with fully assembled race head, performance cam, 20mm carburetor, and...
$ 399.00 -
$ 89.00 Out of stockPolaris Sportsman 90 Top End Cylinder Kit
50 Caliber Racing Top End Cylinder Kit for Polaris Sportsman 90 ATVs. Complete top end rebuild kit for your Polaris Sportsman, Predator or Scrambler 90cc youth ATV. Stock bore size and compression ratio. Our kits are high quality, complete and ready to build right out of the box.
$ 89.00 -
$ 119.00 In stockYamaha Moto-4 250 Top End Cylinder Kit YFM250
50 Caliber Racing top end rebuild kit for your Yamaha YFM250 Moto-4, Bear Tracker and Timberwolf ATV. Our kits are high quality, complete and ready to build right out of the box. You'll be able to take confidence that you'll have the precision components you need to get your toys running again, the right way.
$ 119.00 -
$ 64.00 In stockSuzuki LT80 Kawasaki KFX80 Top End Rebuild Kit
50 Caliber Racing Complete Top End Cylinder Kit for Suzuki LT80 & Kawasaki KFX80 ATVs are brand new with stock bore size. Includes all gaskets and components necessary to rebuild the top end. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment.
$ 64.00 -
$ 45.00 In stock47mm Piston Kit Honda CT70 ATC70 SL70
50 Caliber Racing 47mm Standard Bore Piston Kit for Honda C70 CT70 CL70 SL70 XL70 ATC70 vintage pit bikes. Complete assembly including 47mm piston, wrist pin, rings and circlips. Replaces oem Honda part number 13101-087-000.
$ 45.00 -
$ 525.00 In stock108cc Stroker Kit 2 for Honda 50 70 Pit Bikes
50 Caliber Racing 108cc Stroker Kit #2 for Honda CRF50, XR50, CRF70, XR70 pit bikes is the biggest and baddest big bore kit we offer for your Honda 50cc and 70cc pit bike. Complete with 51mm stroker crank and 52mm piston & cylinder, this kit will increase total displacement to 108cc. This kit includes everything in our Stage 2 Race Head kit, plus a...
$ 525.00 -
$ 275.00 In stock108cc Stroker Kit 1 for Honda CRF50, XR50 & CRF70
50 Caliber Racing 108cc stroker kit #1 for Honda CRF50, XR50, CRF70, XR70 pit bikes adds approximately 2 horsepower over your stock setup! All the components are made specifically for 1988 and newer engines so there will be no fitment issues and no boring of the case necessary. A Honda engine upgraded with this kit will make much more power than Chinese...
$ 275.00 -
$ 155.00 In stock88cc stage 1 big bore kit for honda for xr and crf 70
50 Caliber Racing stage 1 88cc big bore kit for Honda XR and CRF 70's. Fits all years.
$ 155.00 -
$ 155.00 In stock88cc Stage 1 Vintage Big Bore Kit for Honda Z50, CT70, ATC70, TRX70, SL70, XL70
50 Caliber Racing vintage Stage 1 88cc big bore kit. Improved lightweight 52mm piston and cylinder design, with oversized cooling fins for efficient heat dissipation. Includes all gaskets needed for install. - Z50 (1968-1978)- CT70 (1968-1981)- ATC70 (1973-1985)- TRX70 (1986-1987)- SL70 (1971-1973)- XL70 (1974-1976)
$ 155.00 -
$ 299.00 In stockPolaris 500 Top End Rebuild Kit
Polaris Sportsman 500 ATV Top End Cylinder Rebuild Kit with stock bore size and compression ratio. Includes all gaskets and components necessary to rebuild your top end. Manufactured to OEM spec, our kits are complete, high quality, and will extend the life of your toys for many more years of enjoyment.
$ 299.00 -
$ 199.00 Out of stock686cc Big Bore Kit Yamaha Rhino Grizzly Raptor
50 Caliber Racing bolt on 102mm 686cc Big Bore Kit for all Yamaha Rhino Raptor and Grizzly 660 models. This is a complete kit, with everything you need. Our cylinders have larger than stock water jackets for better cooling and are a much more reliable option than boring your stock cylinder.
$ 199.00 -
$ 89.00 In stockYamaha PW50 Top End Cylinder Kit
50 Caliber Racing top end rebuild kit for Yamaha PW50 Pit Bikes have cast aluminum cylinder with black powder coating for a vintage Yamaha look. Standard compression and stock bore size for an all original spec replacement top end kit. Includes everything needed to rebuild your top end. These kits are very high quality and will last for years under normal...
$ 89.00 -
$ 79.00 In stockYamaha PW50 Big Bore 60cc Top End Kit
50 Caliber Racing 60cc big bore top end kit for Yamaha PW50 & QT50 pit bikes is a complete top end cylinder kit, ready to install out of the box.
$ 79.00 -
$ 89.00 In stockYamaha PW80 Top End Rebuild Kit Stock Bore
50 Caliber Racing Top End Cylinder Kit for Yamaha PW80 - Stock Bore for Yamaha PW80 Engines. Lightweight aluminum cylinder with steel sleeve. Oversize cooling fins on cylinder for efficient heat dissipation. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. Fits Yamaha...
$ 89.00 -
$ 89.00 In stockYamaha PW50 Big Bore Kit 60cc With Head
50 Caliber Racing 60cc Big Bore Top End Kit with Head included for Yamaha PW50 & QT50 Pit Bikes. This is a complete bolt on top end cylinder kit including head, ready to install out of the box. Includes a new cylinder head.
$ 89.00 -
$ 99.00 Out of stockTop End Cylinder Kit Yamaha YFM80 Grizzly Raptor Badger
50 Caliber Racing Yamaha YFM 80 top end cylinder kit 1985-2014. Complete top end rebuild kit for your Yamaha YFM 80 Badger, Raptor and Grizzly youth ATV. Our kits are high quality, complete and ready to build right out of the box.
$ 99.00 -
$ 159.00 In stockYamaha Blaster YFS200 Top End Cylinder Kit
50 Caliber Racing aftermarket top end kit with stock bore size for Yamaha YFS 200 Blaster ATVs. Includes all gaskets and components necessary to rebuild the top end. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment.
$ 159.00 -
$ 149.00 Out of stockYamaha Wolverine 350 Top End Cylinder Kit
50 Caliber Racing stock replacement kit for your Yamaha Wolverine 350 ATV! (1995-2005) Our kits are high quality, complete and ready to build right out of the box. You'll be able to take confidence that you'll have the precision components you need to get your toys running again, the right way.
$ 149.00