ENGINE INSPECTION
5-9
EAS20041
ENGINE INSPECTION
EAS30249
MEASURE THE COMPRESSION PRESSURE
The following procedure applies to all of the cyl-
inders.
TIP
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
• Valve clearance
Out of specification
→
Adjust.
Refer to “ADJUSTING THE VALVE CLEAR-
ANCE” on page 3-6.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Rider seat
Refer to “GENERAL CHASSIS (1)” on page
4-1.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• Air filter case
Refer to “AIR FILTER CASE” on page 7-5.
• Air cut-off valve
Refer to “AIR INDUCTION SYSTEM” on
page 7-19.
• Ignition coils
• Spark plugs
Refer to “CAMSHAFTS” on page 5-17.
NOTICE
ECA13340
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug wells to prevent it from
falling into the cylinders.
4. Install:
• Compression gauge “1”
5. Measure:
• Compression pressure
Out of specification
→
Refer to steps (c) and
(d).
a. Set the main switch to “ON”.
b. With the throttle wide open, crank the en-
gine until the reading on the compression
gauge stabilizes.
WARNING
EWA17100
To prevent sparking the plug, remove all ig-
nition coil couplers and fuel injector cou-
plers before cranking the engine.
TIP
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
kgf/cm², 15 psi).
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
→
Eliminate.
d. If the compression pressure is below the
minimum specification, pour a teaspoonful
of engine oil into the spark plug bore and
measure again.
Refer to the following table.
Compression gauge
90890-03081
Engine compression tester
YU-33223
Compression pressure
1261–1624 kPa/210 r/min (12.6–
16.2 kgf/cm²/210 r/min, 179.4–
231.0 psi/210 r/min)
Compression pressure (with oil applied into the
cylinder)
Reading
Diagnosis
Higher than without oil
Piston ring(s) wear or
damage
→
Repair.
Same as without oil
Piston, valves, cylinder
head gasket possibly
defective
→
Repair.
1
Summary of Contents for YZF-R1 2020
Page 1: ...2020 SERVICE MANUAL YZF R1 YZF R1M YZF1000L YZF1000 YZF1000DL YZF1000D B3L 28197 20 ...
Page 2: ......
Page 6: ......
Page 8: ......
Page 38: ...SPECIAL TOOLS 1 29 ...
Page 55: ...TIGHTENING TORQUES 2 16 ...
Page 60: ...CABLE ROUTING 2 21 Frame rear right side view B A C D 2 1 2 3 4 5 6 7 ...
Page 82: ...CABLE ROUTING 2 43 Front brake hose left side view A 1 1 1 1 2 2 2 3 3 3 4 4 4 3 4 ...
Page 86: ...CABLE ROUTING 2 47 Fuel tank top and left side view A B 1 2 3 4 5 2 5 ...
Page 88: ...CABLE ROUTING 2 49 Canister A E 1 2 3 4 5 6 B B B C D 7 8 9 10 E F G H E 7 10 11 ...
Page 92: ...CABLE ROUTING 2 53 Air cut off valve right side view A B C C D E 1 2 2 3 3 3 4 4 5 5 5 6 7 ...
Page 100: ...CABLE ROUTING 2 61 Muffler top and left side view 1 1 2 3 3 4 5 5 6 6 4 4 5 6 5 6 A ...
Page 104: ...CABLE ROUTING 2 65 ...
Page 107: ......
Page 149: ......
Page 171: ...GENERAL CHASSIS 5 4 22 T R Front muffler protector bolt 7 N m 0 7 kgf m 5 2 lb ft b b a a 1 ...
Page 280: ...CHAIN DRIVE 4 131 ...
Page 335: ...ELECTRIC STARTER 5 52 1 2 3 a b ...
Page 388: ...TRANSMISSION 5 105 ...
Page 406: ...WATER PUMP 6 17 ...
Page 433: ......
Page 439: ...IGNITION SYSTEM 8 6 ...
Page 447: ...CHARGING SYSTEM 8 14 ...
Page 451: ...LIGHTING SYSTEM 8 18 ...
Page 486: ...ELECTRICAL COMPONENTS 8 53 ...
Page 495: ......
Page 505: ...SYSTEM DIAGRAM 9 10 ...
Page 531: ...STEERING DAMPER SYSTEM 9 36 ...
Page 815: ...91_ABS 9 320 4 Defective hydraulic unit assembly Replace the hydraulic unit assembly ...
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Page 819: ......
Page 820: ......