Brake Parts
Cooling Parts
Drivetrain & Transmission Parts
Electrical Parts
Engines Parts
Exhaust Parts
Foot Controls & Pegs
Frame & Body
Fuel Parts
Handlebars & Controls
Ignition System Parts
Mounts & Hardware
Performance Chips & Programmers
Racing Exterior & Body Parts
Starting & Charging Parts
Suspension Parts
Windshield & Fairings
Repair Manuals
CLOSE ✕
Brake Parts
Cooling Parts
Drivetrain & Transmission Parts
Electrical Parts
Engines Parts
Exhaust Parts
Foot Controls & Pegs
Frame & Body
Fuel Parts
Handlebars & Controls
Ignition System Parts
Mounts & Hardware
Performance Chips & Programmers
Racing Exterior & Body Parts
Starting & Charging Parts
Suspension Parts
Windshield & Fairings
Repair Manuals
Description
- Includes: Shaped, domed cylinder head, state of the art cylinder with special porting, lighter flat top piston assembly (all of which are designed for higher compression and improved combustion efficiency), forged crankshaft assembly with larger 12mm wrist pin, top end gasket set, 19mm Dell'Orto carburetor, carbon reed valve petals, throttle cable, and Athena racing exhaust system. Replacement of clutch rollers and springs may be needed for proper tuning
- Cylinder kits include cylinder, head, piston assembly, reeds, and gaskets
- Piston kits include piston, rings, wrist pin, and circlips
- Carburetors have a manual choke assembly and include a selection of main jets
- Hyper Race crankshafts have a lighter connecting rod, full crank rounds, and special needle bearings, but will not work with OEM type stock or standard Athena big bore pistons due to the larger 12mm wrist pin size.
California residents
WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
CLOSE ✕
Recently viewed products
Athena
YZ 125 Big Bore Pistons 05-06
$235.58
No image
Edelbrock
E-Series Cylinder Head Bolt Kit # for Ford 351W engines
$132.75
No image
Vertex
Engine Oil Seal 30 X 78 X 9 F
$8.35
No image
Vertex
Engine Oil Seal 54 X 73 X 10 F
$8.35
No image
Athena
Top End Piston Kit; KTM 250 Sx 07-16
$190.78
No image
Athena
Top End Piston Kit; KTM 125 Sx 02-15
$164.39
No image
COMP Cams
Max-Lift BSR Shaft Rocker System for GM Gen V/LT engines
$928.95
No image
Vertex
Engine Oil Seal 25 X 41.5 5 X 10
$4.61
No image
Vertex
Engine Oil Seal 35 X 72 X 10 R
$7.01
No image
Namura
Engine Oil Seal Set 3PCS
$31.28
No image
Athena
Head Kit YZ125 Lc OEM
$265.89
No image
Edelbrock
Valley Cover Plate Kit for Chrysler Rb (440) Engines Using Victor Heads
$71.95
No image
Vertex
Engine Oil Seal 25 X 42 X 7
$4.61
No image
Vertex
Engine Oil Seal 30 X 50 X 8
$4.86
No image
Namura
Engine Oil Seal Set 12PCS
$35.64
No image
Namura
Engine Oil Seal Set 2PCS
$12.44
No image
All balls Racing
Engine Bearing, Open, C4 22-56-16
$33.14
No image
Vertex
Engine Oil Seal 32 X 78 X 8
$6.94
No image
Vertex
Engine Oil Seal 35 X 50 X 8
$8.20
No image
Namura
Engine Oil Seal Set 5PCS
$17.00
Subscribe to our newsletter to receive exclusive offers, product recommendations, expert tips and more.