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MK1000975
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 Piston Gasket Kit Part Number MK1000975
- Includes: NICHE Cylinder Piston Gasket Kit
- Compatible with the following brands: Yamaha
- Compatible with the following models: YZ80, YZ85
- Replaces for the following OEM MPN's: 4ES-11311-30-00, 93210-56459-00,93210-84724-00, 4ES-11351-00-00, 4ES-11631-01-A0, 4ES-11633-00-00,43K-11611-00-00, 93450-16115-00, 4ES-11311-20-00
- Compatible Vehicle: ATV
- Placement on Vehicle: Front
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.
Abigail Lusted
Reviewed in Canada on February 27, 2025
I purchased the 85cc kit but inspecting the pistons oem is just a bit bigger then the piston in the kit, the kit works together (piston and cylinder go together) just not a 85cc kit
michael clim
Reviewed in the United States on June 23, 2024
I did a complete rebuild of my grandsons YZ85! I used only the case and head…..every other part was new. The hour meter showed 4.5 when the engine lost power and eventually found its way back to me for inspection. Now there are a million things that can cause the failure I seen, but it wasn’t obvious which one it was. We used a very high quality oil so that shouldn’t have been the issue. The ratio was 30-1 so that was correct. The piston ring was stuck at the exhaust port position. After inspection it was hard to determine what came first, but the cylinder chrome looked like it could have peeled at the port web, and was the cause of the issue. We replaced the cylinder and piston and its back in business. I will not buy these cylinders any more. All it takes is one issue like we experienced and the trust is gone. These are priced in a way that makes them appealing to those with limited funds but for us, it didn’t pay off.
Philip
Reviewed in Canada on September 2, 2023
Works good on the bike with a really good price. Seams to last good
Gavin
Reviewed in the United States on July 19, 2023
This worked on my 2004 yz85 and lasted around 50hrs of very harsh riding, and 2 strokes are supposed to be rebuilt every 25hr so this was perfect, will definitely buy again, and highly recommended
Christine
Reviewed in the United States on June 19, 2023
Installed on my daughter's 2006 YZ85 and started right up.Have about 12-15 hours of slow to medium speed trail riding including me (full size dad) getting it up a couple tough hills.Working well so far. Thanks Niche!
Brandon parker
Reviewed in the United States on March 1, 2023
I’ve put a lot of Hour on the Factory Top End, Then I put straight gas in on accident and fired the top end, so I bought this top end rebuild kit and I did it all to the books! Put a compression tester on it before starting and 10 kicks w/ throttle open it had 100 psi on first 10 kicks! Soo I installed the spark plug in and kicked it 100 times before it started and it ran maybe 20-30 mins and was fried
chickenuggettsss
Reviewed in the United States on September 18, 2022
Doesn't compare to OEM at all, but i got 4 hrs so far on this rebuild kit n it's running great!
Last Shot
Reviewed in the United States on October 6, 2021
My twelve year old rebuilt his YZ85 and this thing screams. Wheelies like no tomorrow
Mardio du Québec
Reviewed in Canada on October 1, 2021
The media could not be loaded.
Crystal
Reviewed in the United States on January 22, 2021
Great product! Fit great!
Nicolas
Reviewed in the United States on April 23, 2021
Great kit to get your bike up and running. She rips now! Everything fits great and everything looks flawless! A in my book! Thank you very much!
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