Flywheel

Flywheel
The flywheel provides a friction surface for the clutch disc, a mounting surface for the pressure plate, a mounting for the starter driven gear, and on some engines, the flywheel is a factor in engine balance.

The condition of the friction surface of the flywheel is important for proper clutch function. The surface should be smooth and free of burned spots and surface cracks. Used flywheels can be re-surfaced. This should be done by grinding rather than lathe turning as less material is removed. The amount of material removed from the face can affect which clutch release bearing should be used. A flywheel should always be checked for runout on the engine it will be used on. Face runout should not exceed .005 (five thousandths) of an inch.

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Transmission Front Bearing Retainer

Transmission Front Bearing Retainer
This great device has three critical functions. This first is as its name implies. The second is to provide a register on which the bellhousing must center. This is feature is sometimes overlooked with expensive consequences. Thirdly, its tubular snout is the surface on which the throwout bearing rides on its way into to depress the springs of the pressure plate. Conversions often require special and modified retainers to acheive compatibility.

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Clutch Release Bearing

Clutch Release Bearing
As its name implies, this is the bearing that releases the clutch. It is often referred toas a "throw-out" bearing. They come on a number of different style carriers. The carriers, in some cases, vary considerably with the particular engine.Because the release bearing only works when the clutch is being released it usually lasts quite a long time. However, improper linkage adjustment or riding the clutch with your foot when driving can wear the bearing prematurely. Normally there should be a minimum of 1/16" clearance between the face of the bearing and the three release fingers or diaphragm spring of the pressure plate when the clutch is engaged. This fact is important and will be discussed further when we get to the part about setting up the clutch linkage.

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Pilot Bushing

Pilot Bushing
In most cases, this is a porous bronze, pre-lubed bushing rather than an actual bearing, as it is often called. A few applications still use an actual bearing and others use a needle roller type bearing, but by far, the most common type is bronze. You cannot use a roller bearing on a transmission shaft originally designed for a bronze bushing due to different type of heat treatment on the shafts. The pilot bushing is seldom thought of as a part of the clutch system but it is one of the most vital parts of the system. It pilots the end of the transmission input gear in the crankshaft. If it is worn or not running "true", it can cause serious clutch problems or transmission failure. Pilot bushing bore runout should always be checked with a dial indicator and should be within .002 total. The bronze bushing type should be a press fit in the crankshaft bore. It must be installed carefully. It should have between .001 and .003 clearance on the transmission shaft when installed. The pilot bushing is only functional when the clutch is disengaged but it is a factor in input gear alignment at ALL times

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Wet Clutch

Wet Clutch

Wet clutch are universal and found on any bike. Almost 99% of motorcycle manufactured uses this kind of clutch. In the wet clutch set up the entire clutch is inside the case of the bike. Here it is bathed in oil which acts like a kind of dampener. It stops the clutch from knocking on itself.

Advantages:

• It has less wear and tear effect due to oil circulation.
• It has smoother engagement compare to dry clutch
• It is cooled by engine oil
• It tolerates slipping during initial clutch take off
• It is cheaper to manufacture
• The wet clutch operation is quiet and makes less noise compare to dry clutch operation.

Disadvantages:

• Oil needs to be circulated specially for the clutch presence.
• Due to rotation of clutch in oil then engine losses some horse power to rear wheel
• Clutch garbage and hammer mixes in engine oil (an oil filter fitted to avoid such problem)

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Clutch Basket

Clutch Basket: It is bowl shaped basket which holds entire clutch assembly. It has teethes on the outside surfaces which fix on the primary drive teethes. It means that it is connected with the transmission. It is bolted onto the end of clutch shaft.

 

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Dry Clutch

Dry Clutch:

The dry clutch is almost identical to the wet clutch the only difference s there are seals on the shafts that keep oil out. In the dry clutch set up the entire clutch is outside the case of the bike.

There is no oil circulated in to the clutch, which result into clutch knocking on itself. Ducati’s are almost the only bike with this type of clutch.
Advantages:

• It is very easy to replace as it is outside the case of bike.
• Oil does not need to circulate for clutch, which ultimately eliminate reduction in loss of Horse power due to oil circulation in clutch. It is the biggest reason why it is use in Moto GP racing.
• You can use friction modified oils in engine
• It is easier to use.

Disadvantages:

• Sometimes it has tendency to grab during engagement which makes take off difficult.
• The clutch overheats due to grabbing effect and wears out very fast.
• The same thing makes clutch operation less progressive.
• It has very shorter life.
• Once hot it is very difficult to calm if there is no open clutch cover is there.
• It is very noisy sometimes makes you feel like hammering.

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Clutch Lever

Clutch Lever: It is metal rode which pivots on a perch located of the left handlebar. It gives input to clutch assembly.

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Clutch Cable

Clutch Cable: The clutch cable is a cable through which the rider’s input passes to the clutch internals.

Clutch Cover: It covers the entire clutch assembly.

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Driven (steel) plate

Driven (steel) plate: It is ring shaped and made of steel and sometime of aluminum. The surfaces of steel or aluminum plate interfaces between pressure plate and clutch hub. It has teethes on inside surfaces. This teethes are fix on the cutouts of clutch hub. Mostly steel plates are used in clutch assembly due to their durability. The aluminum plates are used in Moto GP due to their lighter weight. These plates are worn out very fast compare to steel plate.

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Pressure Plate

Pressure Plate: It is the moving part of the clutch assembly which works against clutch spring tension. It releases the clamping action on the clutch plates when the clutch lever is engaged.

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Clutch springs

Clutch springs: The clutch springs shape is like short coil. These springs continuously hold the friction and steel or aluminum plates through spring tension. It also prevents slippage except when the clutch lever is engaged. Most of motorcycle has five or more springs used per clutch assembly. For higher engine output stiffer or more springs are used while softer or few springs used in order to lighter clutch level pulling effort.

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Clutch Hub

Clutch Hub: The clutch hub places between clutch basket and pressure plate. The clutch plates are mounted on it. It has teethes in the centre hole which rotate with main shaft. It means it is connected with the engine.

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Drive (friction) plate

Drive (friction) plate: The friction plate is ring shaped and coated with fiber. It is a wear and tear part of clutch assembly. The friction plate surfaces interface between the clutch basket tangs (gaps) and pressure plate. It has teethes on the outside surfaces. These teethes fix on the cutouts between clutch hub tangs (gaps). It is coated with the same material as you see in brake pad (shoe).

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Clutch Plate

Clutch Plate: There are two types of plates in clutch plate. One is Drive (friction) plate another is Driven (Steel) plate

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How A Clutch Works

How A Clutch Works

In a normal condition a clutch is engaged with the engine. When a rider presses the clutch lever for changing gears, the coil springs in the clutch compressed and the pressure plate expands which allows the stake of clutch plates to move independently. The stake of clutch is arranged in such a manner that friction plate and steel plate alternate. It makes the engine and clutch to move at different speeds. Ultimately the clutch disengages power to transmission which allows rider to shift the gears.
There are two types of clutches: Wet clutch & Dry clutch

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Clutch

A clutch is that part of engine which engages or disengages power from the engine crankshaft to transmission. A clutch is mechanism by which you change the gears. In simple words, it turns on or off power to rear wheel. A clutch is made of clutch assembly which includes clutch plate, Clutch basket, Clutch hub, pressure plates, Clutch springs, lever and clutch cable.

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