{"product_id":"90cc-49mm-big-bore-cylinder-kit-for-rs5-dt50-tzr-50-am6-2-stroke-rx-ryz-sm","title":"90cc 49mm Big Bore Cylinder Kit for AM6 2-Stroke RS50 DT50 TZR50 RX RYZ SM","description":"\u003cp\u003e90cc big bore cylinder kit, 49mm, for AM6 2-stroke engines — RS50, DT50, TZR50, RX, RYZ and SM.\u003c\/p\u003e\u003ch3\u003eDetails\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBore: 49mm\u003c\/li\u003e\n\u003cli\u003eCapacity: 90cc\u003c\/li\u003e\n\u003cli\u003eEngine: AM6 2-stroke\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePlease read before ordering\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck the measurement chart carefully against your own engine before ordering\u003c\/strong\u003e — bore, stud spacing and port layout. Allow 0.5–1.0cm for hand measurement.\u003c\/li\u003e\n\u003cli\u003eNo instructions are included. \u003cstrong\u003eProfessional installation is strongly recommended.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAftermarket part.\u003c\/li\u003e\n\u003cli\u003eColours may look slightly different from the photos.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eImportant — legality and safety\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting a big bore kit takes a 50cc moped over the 50cc legal limit.\u003c\/strong\u003e In the UK and most of the EU that changes the vehicle's class: a 90cc machine cannot be ridden on a 50cc licence or a CBT-restricted moped entitlement, and riding it that way voids your insurance and is an offence. The change must be declared to your insurer and, in most countries, to the vehicle registration authority.\u003c\/li\u003e\n\u003cli\u003eA big bore kit also invalidates the machine's type approval and emissions certification.\u003c\/li\u003e\n\u003cli\u003eA 90cc top end needs the carburettor rejetted, the ignition checked and often the clutch and gearing changed. Running it as-is will hole a piston. Have it set up on a dyno or by someone who knows AM6 engines.\u003c\/li\u003e\n\u003cli\u003eThe standard brakes, tyres and suspension were designed for a 50cc machine.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOur standard store returns policy applies.\u003c\/p\u003e","brand":"MMAlto","offers":[{"title":"Default Title","offer_id":49512018575617,"sku":"1005005563378295-Default Title","price":271.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/4544\/6401\/files\/S39170742f8c845e684d7f70b303822342.webp?v=1783087910","url":"https:\/\/mmalto.com\/products\/90cc-49mm-big-bore-cylinder-kit-for-rs5-dt50-tzr-50-am6-2-stroke-rx-ryz-sm","provider":"MMAlto","version":"1.0","type":"link"}