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Motorcycle Theory #1 > Motorcycle Theory: Test #3 Study > Flashcards

Motorcycle Theory: Test #3 Study Flashcards

1
Q

When the clutch doesn’t transfer 100% of the power.

A

Slippage

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2
Q

What is the purpose of a thermostat?

A

Decreases engine warm up time and maintains a minimum operating temperature.

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3
Q

What are the four types of cooling systems?

A

Oil and air cooled
Liquid cooled
Natural air
Forced air

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4
Q

Too little cooling does what?

A

Damages and seizes parts.

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5
Q

What’s unique about a variable ratio clutch?

A

Transmission and clutch combined.

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6
Q

What’s the purpose of a radiator cap?

A

Sets cooling system maximum operating pressure.

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7
Q

What are the five types of manual clutch release mechanism?

A 
Ball and ramp 
Rack and pinion
Level
Can
Screw (worm drive)
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8
Q

Purpose of a cooling system.

A

To conduct harmful heat away from the engine.

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9
Q

____________ engagement is dependent upon engine RPM.

A

Centrifugal Clutch

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10
Q

What is clutch drag?

A

Clutch doesn’t fully disengage.

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11
Q

What’s the purpose of a water pump?

A

A crank powered impeller pump used for circulating coolant.

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12
Q

Too much cooling does what?

A

Robs power.

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13
Q

Define spray clutch.

A

Engages in one direction, free wheels/spins in the other direction.

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14
Q

High output engines use what type of cooling system?

A

Oil and air.

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15
Q

What is the mix ratio of coolant?

A

50-50

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16
Q

Define a gear.

A

A rotary lever.

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17
Q

What’s the most common gear used?

A

Spur gear

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18
Q

What is a power valve?

A

Change his height, width, and length of the exhaust port.

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19
Q

What’s the purpose of the expansion chamber?

A

Shapes the power band and aids in scavenging.

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20
Q

What does the clutch basket freewheel on?

A

The transmission main shaft.

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21
Q

Angle measuring tools.

A

Degree wheel, protractor, torque angle gauge.

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22
Q

How do you find the final drive?

A

Rear wheel divided by transmission app

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23
Q

How do you find the primary drive ratio?

A

Clutch divided by crank.

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24
Q

Where does primary combustion take place?

A

Crank case under the piston crown.

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25
Q

What is the purpose of a clutch?

A

To permit gradual increment/engage and disengage power flow.

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26
Q

Where does secondary compression take place?

A

Above the piston crown.

27
Q

What is the gear ratio formula?

A

Driven divided by a drive.

28
Q

Where do you normally find a planetary gear?

A

And a starter motor or supercharged motorcycles.

29
Q

What is the purpose of offset gears?

A

To reduce backlash and vibrations.

30
Q

What is the transmission Drive ratio?

A

Counter shaft divided by main shaft.

31
Q

Dear ratio for direct drive.

A

1:1

32
Q

Part two of multiple clutch assembly.

A

Basket, drive plates, driven plates, hub, pressure plates, Springs.

33
Q

What are the types of two-stroke piston rings?

A

Standard, Keystone, and Dyke.

34
Q

What is the most tuneable variable intake system?

A

Rotary valve.

35
Q

Most popular piston Port design.

A

Crankcase reed valve

36
Q

What type of cylinder has the best heat transfer?

A

Plated aluminum.

37
Q

What is the purpose of crosshatching?

A

To seat piston rings and controls cylinder lubrication.

38
Q

What are the signs of a wet side seal leak?

A

Engine smokes excessively due to burning transmission oil.

39
Q

What are the signs of a dry side seal leak?

A

Engine runs Lean and Can seize.

40
Q

Where should the piston be positioned on a leak down test?

A

Bottom dead center

41
Q

What are two ratios for two-stroke pre-mixed fuel?

A

31: 1
50: 1

42
Q

What are the two types of bearings in a connecting rod?

A

Needle and roller.

43
Q

Why does the crankshaft need to be sealed?

A

To maintain positive and negative pressure’s in primary areas.

44
Q

How do you find the area of a circle?

A

Length times width times .7854

45
Q

What are the six types of measuring tools?

A

Tape measure, scale caliber, time measure, micrometer, angle measure.

46
Q

What is tolerance?

A

An acceptable range of measure.

47
Q

What was the metric system originally called?

A

MLG

48
Q

What is compression ratio?

A

Compares volume above piston at bottom dead center to volume above top dead center

49
Q

What is loop scavenging?

A

Transfer port angle to minimize the loss of charge out of the exhaust

50
Q

When does the combustion event begin?

A

Before top dead center

51
Q

How many crankshaft revolutions on a two stroke?

A

One

52
Q

What is symmetrical engine timing?

A

Open close equal distance from dead center

53
Q

What creates sonic waves in the expansion chamber?

A

Pressurized combustion gases entering the part.

54
Q

What is the equation for cylinder volume?

A

BxBxSx.7854

55
Q

How do you find engine displacement?

A

Unrounded cylinder volume multiplied by the number of cylinders

56
Q

What is the formula to find compression ratio?

A

(CV+CCV)/CCV

57
Q

What is overdrive?

A

Numerically less then 1 to 1

58
Q

What is under Drive?

A

Numerically more than one to one

59
Q

How do you find the primary drive ratio?

A

Clutch divided by crankshaft

60
Q

Equation to find transmission ratio.

A

Countershaft divided by main shaft

61
Q

How do you find the final drive

A

Rear real divided by transmission output

62
Q

Shaft ratio formula

A

Ring gear divided by pinion gear

63
Q

How do you find the overall gear ratio from a crankshaft to the rear wheel?

A

Unrounded primary ratio multiplied by unrounded transmission ratio multiplied by unrounded final drive ratio

Motorcycle Theory #1 (1 decks)

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