2004 - 2008 Honda CRF 250R CP Piston Kit and CRF250R Big Bore Piston Kits

Each of the below piston kits include:

• Piston
• Piston Pin
• Piston Rings
• Pin Locks

Stock Bore size is 78mm (3.071") Stock Stroke is 52.2mm (2.055")

Cometic top end gasket sets are available separately, but are not included with the piston kit. The matching top end gasket kit for each application is listed in the table below, along with the individual piston kit info.

14.25-1

Stock Bore size is 78mm (3.071") Stock Stroke is 52.2mm (2.055")

2004-2008 CRF250 R PISTON FULL RACE Trenched Pistons
Stock Bore size is 78mm (3.071") Stock Stroke is 52.2mm (2.055")

Full race model pistons are custom forged pistons but available off the shelf. These are single ring, high compression, lightweight pistons which feature a highly efficient dome design that maximizes squish without compromising performance. Lateral gas ports are added to maximize ring seal while a skirt coating is included to provide additional lubrication, minimizing friction in extreme conditions.

The full race pistons come complete with high performance rings, lightweight pins and locks.

Cylinder Works NEW CRF250R Standard Bore and CRF 250 Big Bore Cylinders

Cylinder Works convenient drop in four stroke cylinders take the hassle and the time out of sending in your worn or damaged cylinders for honing and re-plating.

All Cylinder Works cylinders are brand new and both standard bore and big bore sizes look virtually identical to stock OEM cylinders. They are nickel silicon carbide plated for long life and they are precision honed to exact size for easy piston installation. When you purchase a Cylinder Works cylinder there is no core charge or exchange. You receive a brand new, ready to install cylinder.

The 1mm oversize big bore cylinder is designed as a true "drop in" with no extra machine work required to your engine or cases.

The 3mm oversize CRF 250R requires a modification to the case to install the big bore cylinder. The modification is necessary to maintain a minimum thickness on the cylinder spigot. The cases must be completely disassembled and then bolted back together after modification.

Cylinder Works CRF 250R Big Bore Kits

Cylinder Works CRF250R Big Bore Kit features and included parts:

• New cylinder, honed to size for easy piston installation
• Piston kit
• Gasket kit
• Virtually Identical in appearance to stock
• Just purchase and install no machine work required on engine for 1mm oversize kits.
• The 3mm oversize kit DOES require a modification to the case to install the big bore cylinder. The modification is necessary to maintain a minimum thickness on the cylinder spigot. The cases must be completely disassembled and then bolted back together after modification.

Complete CRF250 Big Bore Kit

Replacement CRF 250 Big Bore Piston

CRF250R Big Bore Top End Gasket Kit

Big Bore CRF250R Piston Ring Set

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