compression ratio YAMAHA YZF-R1M 2018 Owners Manual

Periodic maintenance and adjustment7-36
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EAU25872
TroubleshootingAlthough Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
WARNING
EWA15142
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from water heaters or furnaces. Gasoline or
gasoline vapors can ignite or ex-
plode, causing severe injury or
property damage.
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Specifications
EAU70621
Dimensions:Overall length: 2055 mm (80.9 in)
Overall width: 690 mm (27.2 in)
Overall height: 1150 mm (45.3 in)
Seat height:
855 mm (33.7 in) (YZF-R1)
860 mm (33.9 in) (YZF-R1M)
Wheelbase:
1405 mm (55.3 in)
Ground clearance: 130 mm (5.12 in)
Minimum turning radius: 3.3 m (10.83 ft)Weight:Curb weight:200 kg (441 lb) (YZF-R1)
201 kg (443 lb) (YZF-R1M)Engine:Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train: DOHC
Cylinder arrangement: Inline
Number of cylinders:
4-cylinder
Displacement: 998 cm
3
Bore  stroke:
79.0  50.9 mm (3.11  2.00 in)
Compression ratio:
13.0 : 1
Starting system: Electric starter
Lubrication system: Wet sumpEngine oil:Recommended brand:YAMALUBE
Type: Full synthetic
SAE viscosity grades:
10W-40, 15W-50
Recommended engine oil grade: API service SG type or higher, JASO stan-
dard MA
Engine oil quantity: Oil change:
3.90 L (4.12 US qt, 3.43 Imp.qt)
With oil filter removal: 4.10 L (4.33 US qt, 3.61 Imp.qt)Coolant quantity:Coolant reservoir (up to the maximum level
mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator (including all routes):
2.25 L (2.38 US qt, 1.98 Imp.qt)Air filter:Air filter element:Oil-coated paper element
Fuel:Recommended fuel:Premium unleaded gasoline (Gasohol
[E10] acceptable)
Fuel tank capacity:
17 L (4.5 US gal, 3.7 Imp.gal)
Fuel reserve amount: 3.0 L (0.79 US gal, 0.66 Imp.gal)Fuel injection:Throttle body:
ID mark: 2CR4 10Spark plug(s):Manufacturer/model:NGK/LMAR9E-J
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)Clutch:Clutch type:Wet, multiple-discDrivetrain:Primary reduction ratio:
1.634 (67/41)
Final drive: Chain
Secondary reduction ratio: 2.563 (41/16)
Transmission type:
Constant mesh 6-speed
Gear ratio: 1st:
2.600 (39/15)
2nd: 2.176 (37/17)
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