How does a motorcycle internal combustion engine work?

A motorcycle engine works by converting the energy from an explosive fuel-air mixture into mechanical energy, which is then used to power the motorcycle: 

four-stroke cycle piston makes two up strokes and two down strokes per cycle

1. inake Piston down  air/fuel mixture by valves controlled by camshaft. (piston down) (fuel injector or carburetor)
2. Compressions  (piston up)
3. spark (piston down)
4. exhaust volves open to out he gases (piston up)

When piston up compress the air/fuel mixture spark plug sparks and ignite the mixture and push piston down.

Piston have piston rings just like needle syrangee’s plunger

compression ring is to seal the gap between the piston and the cylinder walls. ensure that the air-fuel mixture in the combustion engine does not move down to the crankcase and causes low compression and power.

engine oil in the crankcase, used for lubrication, does not move up into the combustion chamber and gets burnt.

2. wiper ring: clean the liner surface off the excess oil and to act as support backup ring on stopping any gas leakage further down which escaped the top compression ring.

3.oil ring is used to wipe excess oil from the cylinder wall during piston movement. Excess oil is returned through ring openings to the oil reservoir in the engine block.

How Motorcycle engine intake and exhaust valves works

control the entry and exit of air and fuel mixture to the combustion chamber. Most modern bikes have four valves per cylinder (two for inlet, two for exhaust). 

Crank shaft connected timg

Intake and exahaust volves controlled by timing chain

Camshaft

take care of valve controls

1. When the Piston goes down opens Intake volves,
2. When the Piston goes down opens outlet volves,
3. engine misfires if  there is no synchronization between crank & cam shaft

Timing chain connects crank shaft and cam shaft  synchronizes both cam & crank shafts

Symptoms Of Bad Piston Rings

Symptoms of bad piston rings are similar to the symptoms of worn or damaged valve seals. Catching symptoms in the early stages will save your engine and save you from a hefty bill. Here is a list of the most common symptoms for bad piston rings:

• White or gray exhaust smoke  (engine oil burn cumbston chamber)
• Excessive oil consumption  (Worn-out piston rings will lead to oil leaks in the combustion chamber)
• Low power for acceleration
• Overall loss of power or poor performance
• Oil in the intake manifold

10 hours to complete a piston ring replacement.

Piston engine misfire

Engine misfires happen when one of the cylinders does not produce sufficient spark or compression and lack of fuel. It could involve more than one cylinder. It can be caused by a faulty spark plug, fuel injector, ignition coil and or worn cylinder.

raju ginni

Hi, am (rajuginni). writer since 2012, passionate about Knowing new things sharing the same, after engine failure, i became bike enthuaist , you may follow me yoututbe.