{"product_id":"coolster-110cc-pit-bike-420-19t-17mm-front-sprocket","title":"Coolster 110cc Pit Bike 420 19T 17mm Front Sprocket","description":"\u003ch2\u003eCoolster 110cc 420 19T Front Sprocket\u003c\/h2\u003e\n\u003cp\u003eAftermarket 420-chain 19-tooth front drive sprocket for selected Coolster 110cc pit-bike \/ ATV applications using the common 17 mm-type countershaft and 30 mm retainer-hole pattern.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specification\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePart type: Front \/ countershaft drive sprocket\u003c\/li\u003e\n\u003cli\u003eChain size: \u003cstrong\u003e420\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTooth count: \u003cstrong\u003e19T\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMounting-hole \/ shaft type: \u003cstrong\u003e17 mm type\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApprox. splined inner opening: \u003cstrong\u003e14 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApprox. retainer-hole centres: \u003cstrong\u003e30 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApprox. sprocket diameter: \u003cstrong\u003e80 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApprox. thickness: \u003cstrong\u003e6 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaterial: Steel\u003c\/li\u003e\n\u003cli\u003eCondition: Brand new aftermarket replacement \/ gearing sprocket\u003c\/li\u003e\n\u003cli\u003eQuantity: 1 sprocket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant 19-Tooth Gearing Information\u003c\/h3\u003e\n\u003cp\u003eA 19-tooth front sprocket is a relatively large front sprocket for many small motorcycles and pit bikes. If your original sprocket has fewer teeth, fitting 19T changes the final-drive ratio rather than simply restoring the factory gearing. A larger front sprocket generally raises the overall gearing, which can reduce engine RPM at a given road speed but may reduce acceleration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore ordering, check there is enough sprocket-cover \/ crankcase clearance for 19 teeth and enough chain adjustment for the larger sprocket.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFitment Checks\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the chain is \u003cstrong\u003e420 pitch\u003c\/strong\u003e. A 428 sprocket is not interchangeable simply because the shaft size is similar.\u003c\/li\u003e\n\u003cli\u003eCompare the central spline profile and the 17 mm-type mounting arrangement with the old sprocket.\u003c\/li\u003e\n\u003cli\u003eCheck the approximately 14 mm splined opening and 30 mm retainer-hole spacing against your original part.\u003c\/li\u003e\n\u003cli\u003eConfirm the retainer plate \/ fixing arrangement matches your engine.\u003c\/li\u003e\n\u003cli\u003eCheck chain alignment after installation and replace a worn chain and rear sprocket as a set where appropriate.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eFit with the engine safely supported and follow the vehicle manufacturer's procedure for sprocket retention, chain tension and alignment. Rotate the wheel by hand after adjustment to confirm the chain runs freely and the sprocket does not contact the engine case or cover.\u003c\/p\u003e\n\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCoolster 110cc pit-bike \/ ATV applications listed for the 420-19T\/17 mm sprocket family\u003c\/li\u003e\n\u003cli\u003e420 chain\u003c\/li\u003e\n\u003cli\u003e19T gearing\u003c\/li\u003e\n\u003cli\u003e17 mm-type mounting with approximately 14 mm splined opening\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eApplication note:\u003c\/strong\u003e Coolster used several engines and gearing combinations. This listing is for machines matching the stated 420 chain and 17 mm-type sprocket dimensions; compare the original part before purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePackage contains:\u003c\/strong\u003e 1 x 420 19T 17 mm-type front sprocket. Retainer plate, bolts, chain and rear sprocket are not claimed as included unless they are visibly supplied with your stock.\u003c\/p\u003e\n","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":57504413811063,"sku":"02284-DNT","price":9.0,"currency_code":"SHP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0528\/8771\/6007\/files\/20260929_110719.jpg?v=1790781636","url":"https:\/\/www.motomaniauk.com\/products\/coolster-110cc-pit-bike-420-19t-17mm-front-sprocket","provider":"Moto Mania UK","version":"1.0","type":"link"}