What size is a 125cc piston?

Piston / Bore size is 52.4mm. Chinese 110cc and 125cc engine use this size piston, you MUST measure and match the piston diameter 52.4mm before purchase. Please note, a lot of Chinese-made 125cc engine also use this piston, to be sure, please measure your bore size, it needs to be 52.4mm.

What is the standard size piston?

Choosing the right piston size:

English Metric
STD. Bore STD. Bore Manufactured specification size
+ .010 0.25 mm Ten thousands of an inch over manufactured size
+ .020 .050 mm Twenty thousands of an inch over manufactured size
+ .030 .075 mm Thirty thousands of an inch over manufactured size

What are the three types of pistons?

Types of Pistons

  • There are three types of pistons, each named for its shape: flat top, dome, and dish.
  • As simple as it sounds, a flat-top piston has a flat top.
  • Dish pistons present the least problems for engineers.
  • Opposite in concept to the dish pistons, these bubble in in the middle like the top of a stadium.

How do you tell if the piston rings are damaged on a 125 motorbike?

The first is blue smoke coming from the motorcycle’s exhaust. Blue exhaust is a clear sign of an engine that is burning oil. This is caused by an oil leak into the combustion chamber, and the cause of leak could be worn or damaged piston rings. Burning oil is a serious issue that should be addressed right away.

How big is a 150cc piston?


What does 0.50 mean on a piston?

when ur piston says 0.50 it is NOT a 50 over bore… the .50 means half a millimeter meaning .020 over…. ur piston is a 20 over next size would be .030 or .040, .40= a millimeter(67.00)

Do oversize pistons give more power?

The short answer is that a bigger bore is generally the best way to get more power. It creates more space, allowing for bigger valve openings, which in turn can bring more fuel and air into the cylinder. A bigger bore with a shorter stroke also allows an engine to rev higher, which creates more horsepower.

What’s better flat top or dish pistons?

But this comes with a bit of a weight penalty versus a flat-top piston, so the dished piston is more suitable for large-displacement, low-rpm engines. All of this makes the flat-top piston preferable for most performance engines, particularly those that don’t use hemispherical combustion chambers.

How do you calculate the force of a piston?

The piston rod thrust force developed by the fluid pressure acting on the piston is easily determined by multiplying the line pressure by the piston area. FORCE = PRESSURE x AREA or F = PA EXAMPLE: Find the thrust force of a 4″ diameter piston operating with a line pressure of 100 psi.

Can I reuse a scored piston?

There is no problem with a scored piston. Use a not too fine file to clean it up, and use the rings as a tool to clean up the ring grooves.

Can I reuse pistons after honing?

Replacing the piston rings is considered a engine rebuild and you cannot just change them as you must ensure that the cylinder is true, meaning that it is straight from the top of the cylinder to the bottom, and that the cylinder is perfectly round, as well.