MK1001266 About NICHE NICHE provides Powersports replacement parts. Some of the NICHE product categories include cylinders, brake pads, axles, off-road mirrors, and drive chains. NICHE parts are here for when you need them the most. NICHE Cylinder Head Piston Gasket Kit Part Number MK1001266 Includes: NICHE Cylinder Head Piston Gasket KitCompatible with the following brands: Yamaha Compatible with the following models: Timberwolf 250, Bear Tracker 250Replaces for the following OEM MPN's: 29U-11310-03-00, 3GH-11310-01-00, 4BD-11310-01-00, 4BD-11631-00-Y0, 29U-11631-00-Y0, 5VC-11351-02-00, 5VC-11351-02-00 Compatible Vehicle: ATV Placement on Vehicle: Front Cylinder Bore Size: 92mm Cylinder Displacement: 229.6cc; Compression 8.7:1 Cylinder Material: ADC12 aluminum Piston Bore Size: 71mm Piston Surface Coating: Tin-Plated Piston Material: Aluminum Alloy;Type: Dish NICHE Cylinder 519-CCY2243L NICHE Cylinder Head 519-KCY2226H NICHE Piston 519-KPS2242T NICHE Gasket 519-KGS2243K Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.8 out of 5 stars 5 3.9 out of 5 stars 35 — 5.0 out of 5 stars 2 Price $59.95$59.95 $179.95$179.95 $19.95$19.95 $12.95$12.95 92mm 92mm 71mm no data Aluminum Aluminum Aluminum no data Engine Type 4 Stroke no data no data no data Cooling Type Air no data no data no data Fittings No no data no data no data Piston Type no data no data Dish no data Surface Coating None None Tin-Plated None Includes Base Gasket no data no data no data Yes Includes Head Gasket no data no data no data Yes NICHE CYLINDER ATV engines come with either one or two cylindersDisplacements typically measuring between 100cc and 800ccIt's important to note that safely riding an ATV requires a certain amount of body weight and physical strength Disaster can strike, for example, when a young rider uses an overpowered or a larger ATV NICHE PISTON An ATV piston is a component of engines, pumps, and gas compressors. It is located in a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft through a piston rod and or connecting rod Piston Anatomy A piston is a cylindrical engine component that slides back and forth in the cylinder bore by forces produced during the combustion process. The piston acts as a movable end of the combustion chamber. The stationary end of the combustion chamber is the cylinder head. Piston Components ATV Piston components include the piston head, piston pin bore, piston pin, skirt, ring grooves, ring lands, and piston rings. The piston head is the top surface of the piston which is subjected to tremendous forces and heat during normal engine operation NICHE CYLINDER HEAD A cylinder head is usually located on the top of the engine blockIt serves as a housing for components such as the intake and exhaust valves, springs and lifters and the combustion chamberThe passages in the cylinder head allow air and fuel to flow inside the cylinder while permitting the exhaust gases to flow out of itThe cylinder head uses a gasket that aids in preventing water or oil from leaking into the combustion chambers NICHE GASKET A gasket is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. Some Types of Gaskets: Head gaskets create a seal between the engine block and cylinder head. This seal establishes a proper compression and prevents fluid leaks into the cylindersBase gaskets create a seal between the top-end of your engine and the engine cases. Stop pesky engine oil leaks before they cause permanent damage to your engine.The valve cover is sealed to the upper section of the engine cylinder head by a valve cover gasket. As it passes around the camshafts, rockers, and valves, the gasket stops engine oil from seeping out.