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MK1003105
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 Number MK1003105
- Includes: NICHE Cylinder Head Spark Plug Piston Gasket
- Compatible with the following brands: Yamaha
- Compatible with the following models: YZ85
- Replaces for the following OEM MPN's: 4ES-11351-00-00,5PA-11311-30-00,5PA-11111-01-00,93210-56459-00,93210-84724-00,BR1-0EG00-00-00,93450-16115-00,90116-08394-00,90176-08026-00,90201-080L8-00,93310-21403-00,4ES-11633-00-00,5PA-11631-00-D0,5PA-11631-00-C0,5PA-11631-00-B0,5PA-11631-00-A0,4ES-11631-01-A0,4ES-11631-01-B0,4ES-11631-01-D0,4ES-11631-01-C0
- Compatible Vehicle: Mini Bike/Pit Bike
NICHE CYLINDER
- ATV engines come with either one or two cylinders
- Displacements typically measuring between 100cc and 800cc
- It'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 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 cylinders
- Base 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.
NICHE CYLINDER HEAD
- A cylinder head is usually located on the top of the engine block
- It serves as a housing for components such as the intake and exhaust valves, springs and lifters and the combustion chamber
- The passages in the cylinder head allow air and fuel to flow inside the cylinder while permitting the exhaust gases to flow out of it
- The cylinder head uses a gasket that aids in preventing water or oil from leaking into the combustion chambers
Lucas
Reviewed in the United States on March 30, 2025
Exelente calidad
Brody Stratton
Reviewed in the United States on March 21, 2025
The exhaust port doesn’t fit yz’s exhaust. What I mean is the exhaust is supposed to go in the inside side but it goes on the outside. So doesn’t fit even though it says
Randall Trojacek
Reviewed in the United States on March 29, 2021
Thread insert was not installed correctly. Could not get the torque needed. Bought a different off of EBay
Nicholas
Reviewed in the United States on February 25, 2021
Good!!
Juan Garcia
Reviewed in the United States on June 19, 2020
Received the kit 2 days ago installed it and I have had no issues.
Jessica Clark
Reviewed in the United States on June 11, 2020
Very disappointed. Bought this kit and replaced on my son’s 2005 YZ85 and he rode the track 30 minutes and it lost all compression and wouldn’t start for the rest of the time at the track. We got home, tore the bike down again and it was pretty much grenaded. I expected it to not last us years but I expected for more than 30 minutes...
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