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Motorcycle Knowledge ABC

What is a horsepower?

1 horsepower is not only in seconds, weighs 75 kilograms (kg) of objects pulled 1 meter (m), called a horsepower in daily to see the specifications table, such as: 70ps/8000 rpmnot only that the engine produces 70 horsepower, 8000 rpm. rpm is the engine revolutions per minute of the abbreviation.

What is torque?

Torque is also called the torque, is to make the axis of rotation of the torque. XXX common units of torque kg-m (international units of Nm).

Example: tighten the screws with a screwdriver or wrench, screwdriver or wrench length of 1m, at one end of a screwdriver or wrench plus 1kg of force, the screw is screwed in order to better understand the concept of torque, the following are some examples. tight Torque 1kg-m, if the length of the screwdriver or wrench 0.5m 2kg of force must be exerted in order to get 1kg-m of torque, and vice versa, if the drive torque the same, the farther away from the center of rotation position, the forces generated are smaller.

How to calculate the displacement?

Bore ------ cylinder diameter referred to as the bore.

Stroke ------ piston in the cylinder reciprocating movement, the distance traversed is called the piston stroke when the piston from top dead center (TDC), run to the next stop point (BDC), referred to as stroke or stroke. (Now the Honda CBR600RR in 2003, for example, the engine forms: water-cooled four-stroke parallel four-cylinder 16-valve DOHC engine, for example:

Bore and stroke (67.0mm) (42.5mm).

Displacement calculation method:

Cylinder of basal area X stroke X number of cylinders = exhaust the total cc

Stroke ------ 42.5mm = 4.25cm

Bore ------ 67.0mm = 6.7cm

Basal area ---- 3.35 3.35 X-3.1416 = 35.25

Basal area of ​​35.25 X-stroke 4.25 X the number of cylinders 4 = total displacement of 599cc


Here the term "clutch" to refer to the transmission system clutch structure, to play files cars left hand lever, it will be termed "clutch lever" to avoid confusion.

To understand the use of "semi-clutch", it must first have a basic understanding of the structure of the clutch.

The use of the clutch for power separation and bonding action. Its one end to the engine crankshaft, the other end to the gear, responsible for joint action between the two from the clutch friction plate. Cylinder when the engine is running, the movement of the piston up and down movement through the crankshaft is converted to rotary movement, the rotation of the crankshaft drive clutch rotation, rotation movements only to the clutch when the clutch friction plate separation is no longer transmitted down when the clutch friction plate bonding , the spins continue to send to the gear by gear to pass the current gear the gear has been sent down until the rear wheels so far. On the other hand, the action of the rear wheel's rotation status is sent to the engine, but also by the clutch to be complementary.

Adjustment of the clutch

Before adjusting the clutch lever must have the concept of the clutch lever clearance (hereinafter referred to as the clutch gap), so-called clutch gap in the pressure of the clutch lever means, should have the front section of the clutch lever free activities, but will not pull the clutch distance. Let go of the clutch lever, with a hand shake to see the previous paragraph is not loose? From start to finish as tight, it means there is no gap, so, that is, even if the whole release the clutch lever, clutch there is no way The full engagement, the clutch will remain in the half-clutch, sliding state. This is a very bad thing. So adjust the clutch lever, the first thing you should make sure there must be clutch gap.

There is a gap, again we must determine the size of the gap is moderate. The clearance of the clutch, if larger, then pull the clutch in the clutch lever pull in the end, the distance is small, less favorable for the separation of the clutch. The gap is too big clutch enough, to play the file difficult to play, the gap is not easy into the file, pull the clutch slide will have the resistance of the engine brake. So if the gap of the clutch tune smaller lever pull ropes in long distance, you can make better able to effectively achieve the purpose of the clutch.Principles of Motorcycle Carburetor

Motorcycle carburetors look very complex, but as long to master some of the principles, you will be able to adjust your motorcycle to the best condition. All carburetors work under the basic principle of atmospheric pressure. The atmospheric pressure is a powerful force to put pressure on all things. It will be subtle changes, but typically 15 pounds per square inch pressure (PSI). This means that the atmospheric pressure on anything pressure is 15 pounds per square inch pressure. By changing the atmospheric pressure within the engine and carburetor, we can change the pressure and the fuel and air flow through the carburetor.

Atmospheric pressure to low pressure from the high-pressure diffusion. When the two-stroke engine the piston is the only point (or four-stroke engine the piston at TDC), the formation of a low pressure in the piston of the crankshaft in the box below (four-stroke engine piston above). This low pressure will cause the low-pressure carburetor. The higher pressure outside the engine and carburetor, air will burst into the carburetor into the engine until the pressure was balanced. Through the carburetor air flow will drive the fuel, the fuel will be mixed with air.

Inside the carburetor section of pipe, pipe contraction part is accelerated by forcing air inside the carburetor. Sudden narrowing of the river can be used to illustrate the occurrence into the carburetor inside the case. The river will speed up the river bank near the narrowed riparian continuous narrowing will be faster. The same thing happens inside the carburetor. Accelerate the flow of air will cause the carburetor inside the atmospheric pressure is reduced. Air flow, the faster the carburetor inside the lower the pressure. By tube placed inside the pipes, we can take advantage of the low pressure fuel mixed with air flow.

Most motorcycle carburetor channel is throttle position and engine speed control. There are five main conditioning systems inside most motorcycle carburetors. These regulatory systems affect each other, they are:

Idle channel

Pilot jet

The main nozzle and needle

The main jet

Choke channel

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