{"product_id":"fmf-fatty-expansion-chamber-pipe-020124-for-1984-1986-yamaha-yz250","title":"FMF Fatty Expansion Chamber Pipe 020124 for 1984–1986 Yamaha YZ250","description":"For an all-around power increase throughout the power range!\n\u003cp\u003eUpgrade the power delivery of your 1984, 1985, or 1986 Yamaha YZ250 with the FMF Fatty Expansion Chamber Pipe, manufacturer part number 020124 and vendor part number 78-1306. Designed for an all-around power increase throughout the power range, this pipe helps broaden usable performance for motocross, trail riding, and general off-road use. The Fatty model is an excellent choice for riders seeking balanced power without concentrating the delivery exclusively at the low or high end of the powerband.\u003c\/p\u003e\u003cp\u003eFeature: The FMF Fatty expansion chamber is electro-nickel plated for a durable, non-chip finish that resists discoloration during normal use. This finish provides a clean appearance while helping protect the pipe from common riding conditions. The factory pipe is the exception, featuring hand-pounded welds and no coating, similar to the pipes used on works bikes.\u003c\/p\u003e\u003cp\u003eFeature: FMF offers multiple power-focused designs for compatible applications, including Gnarly pipes for increased low-end torque and heavy-duty off-road durability, and Factory Rev pipes for stronger middle- and upper-RPM performance. The Fatty configuration balances the powerband, making it suitable for riders who want improved overall response and a wider range of usable engine performance.\u003c\/p\u003e\u003cp\u003eThe FMF Pipe Fatty is built specifically to fit the 1984 Yamaha YZ250, 1985 Yamaha YZ250, and 1986 Yamaha YZ250. Confirm the motorcycle year and model before ordering to ensure proper fitment. Installation hardware, clearance requirements, and exhaust sealing components should be checked against the motorcycle and the manufacturer’s instructions. With its application-specific design and broad power focus, FMF part number 020124 is a practical performance upgrade for maintaining strong, versatile two-stroke power.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eElectro-nickel-plated finish helps resist chipping and discoloration\u003c\/li\u003e\n\u003cli\u003eFatty design provides an all-around power increase throughout the power range\u003c\/li\u003e\n\u003cli\u003eApplication-specific expansion chamber for 1984–1986 Yamaha YZ250 models\u003c\/li\u003e\n\u003cli\u003eFMF manufacturer part number 020124\u003c\/li\u003e\n\u003cli\u003eVendor part number 78-1306\u003c\/li\u003e\n\u003cli\u003eAlternative FMF designs include Gnarly for low-end torque and Factory Rev for middle- and upper-RPM power\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1984 Yamaha YZ250\u003cbr\u003e\n1985 Yamaha YZ250\u003cbr\u003e\n1986 Yamaha YZ250","brand":"FMF","offers":[{"title":"Default Title","offer_id":67552824623339,"sku":"78-1306","price":291.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/2b9a-572a8971aa757_d177974c-64c2-4287-93b1-a549a18e89ca.jpg?v=1790741659","url":"https:\/\/ctracingservices.com\/products\/fmf-fatty-expansion-chamber-pipe-020124-for-1984-1986-yamaha-yz250","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}