Dirt Racing Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator

Dirt Racing Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator. Find the product specifications and compatibility information below.

Product details

• Product: Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator
• Part number: 56-K239.40.CK
• Brand: Dirt Racing
• Complete 40.00 mm top-end cylinder kit for Polaris 50 cc two-stroke youth ATVs, supplied with cylinder, piston, rings, gaskets and cylinder head. Designed for the 50 cc Scrambler, Sportsman and Predator models that use a 40 mm bore, 10 mm wrist pin and 50 mm stud spacing; not suitable for 90 cc engines, which require a 52 mm bore kit.
• Complete kit: cylinder, piston, piston rings, gaskets and cylinder head
• For 50 cc two-stroke Polaris youth engines
• 40.00 mm bore cylinder
• 10 mm wrist pin compatibility
• 50 mm cylinder stud spacing
• Engine type: single-cylinder, two-stroke, air-cooled
• Bore × stroke: 40.00 mm × ~39.1 mm (≈49 cc)
• Wrist pin diameter: 10 mm
• Cylinder stud spacing: 50 mm (centre-to-centre)
• Spark plug type: NGK BPR7HS
• Cross-Reference OEM Part Numbers
• Cylinder: 0451718 (50 cc applications)
• Cylinder head: 0451717 (50 cc applications)
• Base gasket: 0450008 (50 cc applications)
• Head gasket: 0450003 (50 cc applications)
• Piston (Predator 50): 0453833 (50 cc applications)
• Spark plug: 0450005 (BPR7HS)
• Stud, cylinder/head: 0450010; nuts: 0450011, 0450012
• Cylinder: 0450007 (90 cc/52 mm applications – not for this 40 mm kit)
• Gaskets: 0455372 (base), 0455373 (head) (90 cc/52 mm applications – not for this 40 mm kit)
• Piston kits: 0450802, 0450704, 0450651 (90 cc applications – not for this 40 mm kit)
• Vehicle Fitments
• Polaris Scrambler 50 (2001–2003)
• Polaris Sportsman 50 (2001–2003)
• Polaris Predator 50 (2004–2006)
• Note: Polaris 90 cc models (Scrambler 90, Sportsman 90, Predator 90) require a 52 mm bore cylinder kit and are not compatible with this 40 mm kit

Compatibility

No separate vehicle-fitment table record was supplied for this part. Check any application details, sizes and specifications above before ordering.

Why buy from FDY Performance?

FDY Performance is a UK motorcycle and ATV parts specialist. We help riders find parts with clear specifications, vehicle fitment information where available and support before ordering.

Need help choosing the right part?

Contact us with your bike make, model and year, plus the part number shown above, and we can help you check compatibility.

• Call: 07765 534854
• Email: fdy@fdyperformance.com
• Website: www.fdyperformance.com