{"product_id":"oro2u-56-k239-40-ck-fb456d1c","title":"Dirt Racing Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator","description":"\u003cp\u003eDirt Racing Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator. Find the product specifications and compatibility information below.\u003c\/p\u003e\u003ch3\u003eProduct details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eProduct: Cylinder Kit 40.00mm Std 01-06 Polaris 50 Scrambler Sportsman Predator\u003c\/li\u003e\n\u003cli\u003ePart number: 56-K239.40.CK\u003c\/li\u003e\n\u003cli\u003eBrand: Dirt Racing\u003c\/li\u003e\n\u003cli\u003eComplete 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.\u003c\/li\u003e\n\u003cli\u003eComplete kit: cylinder, piston, piston rings, gaskets and cylinder head\u003c\/li\u003e\n\u003cli\u003eFor 50 cc two-stroke Polaris youth engines\u003c\/li\u003e\n\u003cli\u003e40.00 mm bore cylinder\u003c\/li\u003e\n\u003cli\u003e10 mm wrist pin compatibility\u003c\/li\u003e\n\u003cli\u003e50 mm cylinder stud spacing\u003c\/li\u003e\n\u003cli\u003eEngine type: single-cylinder, two-stroke, air-cooled\u003c\/li\u003e\n\u003cli\u003eBore × stroke: 40.00 mm × ~39.1 mm (≈49 cc)\u003c\/li\u003e\n\u003cli\u003eWrist pin diameter: 10 mm\u003c\/li\u003e\n\u003cli\u003eCylinder stud spacing: 50 mm (centre-to-centre)\u003c\/li\u003e\n\u003cli\u003eSpark plug type: NGK BPR7HS\u003c\/li\u003e\n\u003cli\u003eCross-Reference OEM Part Numbers\u003c\/li\u003e\n\u003cli\u003eCylinder: 0451718 (50 cc applications)\u003c\/li\u003e\n\u003cli\u003eCylinder head: 0451717 (50 cc applications)\u003c\/li\u003e\n\u003cli\u003eBase gasket: 0450008 (50 cc applications)\u003c\/li\u003e\n\u003cli\u003eHead gasket: 0450003 (50 cc applications)\u003c\/li\u003e\n\u003cli\u003ePiston (Predator 50): 0453833 (50 cc applications)\u003c\/li\u003e\n\u003cli\u003eSpark plug: 0450005 (BPR7HS)\u003c\/li\u003e\n\u003cli\u003eStud, cylinder\/head: 0450010; nuts: 0450011, 0450012\u003c\/li\u003e\n\u003cli\u003eCylinder: 0450007 (90 cc\/52 mm applications – not for this 40 mm kit)\u003c\/li\u003e\n\u003cli\u003eGaskets: 0455372 (base), 0455373 (head) (90 cc\/52 mm applications – not for this 40 mm kit)\u003c\/li\u003e\n\u003cli\u003ePiston kits: 0450802, 0450704, 0450651 (90 cc applications – not for this 40 mm kit)\u003c\/li\u003e\n\u003cli\u003eVehicle Fitments\u003c\/li\u003e\n\u003cli\u003ePolaris Scrambler 50 (2001–2003)\u003c\/li\u003e\n\u003cli\u003ePolaris Sportsman 50 (2001–2003)\u003c\/li\u003e\n\u003cli\u003ePolaris Predator 50 (2004–2006)\u003c\/li\u003e\n\u003cli\u003eNote: 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\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eNo separate vehicle-fitment table record was supplied for this part. Check any application details, sizes and specifications above before ordering.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eWhy buy from FDY Performance?\u003c\/h3\u003e\u003cp\u003eFDY 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.\u003c\/p\u003e\u003ch3\u003eNeed help choosing the right part?\u003c\/h3\u003e\u003cp\u003eContact us with your bike make, model and year, plus the part number shown above, and we can help you check compatibility.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCall: \u003ca href=\"tel:+447765534854\"\u003e07765 534854\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eEmail: \u003ca href=\"mailto:fdy@fdyperformance.com\"\u003efdy@fdyperformance.com\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eWebsite: \u003ca href=\"https:\/\/www.fdyperformance.com\"\u003ewww.fdyperformance.com\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Dirt Racing","offers":[{"title":"Default Title","offer_id":59664099213660,"sku":"56-K239.40.CK","price":56.89,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0866\/6982\/0252\/files\/56-k239-40-ck.jpg?v=1793123453","url":"https:\/\/fdyperformance.com\/products\/oro2u-56-k239-40-ck-fb456d1c","provider":"FDY performance Ltd","version":"1.0","type":"link"}