compression ratio YAMAHA YZF-R6 2018 Owners Manual

Periodic maintenance an d a djustment
7-39
7
EAU25872
Trou bleshootin g
Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur
during 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
inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWA15142
When checkin g the fuel system, do
not smoke, an d make sure there are
no open flames or sparks in the ar-
ea, inclu din g pilot lig hts from water
heaters or furnaces. Gasoline or
g asoline vapors can i gnite or ex-
plod e, causin g severe injury or prop-
erty damag e.
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Specifications
9-1
9
Dimensions:
Overall length:2040 mm (80.3 in)
Overall width:
695 mm (27.4 in)
Overall height: 1150 mm (45.3 in)
Seat height: 850 mm (33.5 in)
Wheelbase:
1375 mm (54.1 in)
Ground clearance: 130 mm (5.12 in)
Minimum turning radius: 3.6 m (11.81 ft)
Wei ght:
Curb weight:
190 kg (419 lb)
Engine:
Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train: DOHC
Cylinder arrangement: Inline
Number of cylinders:
4-cylinder
Displacement: 599 cm³
Bore × stroke:
67.0 × 42.5 mm (2.64 × 1.67 in)
Compression ratio:
13.1 : 1
Starting system: Electric starter
Lubrication system: Wet sump
Engine oil:
Recommended brand:
YAMALUBE
SAE viscosity grades: 10W-40, 20W-40
Recommended engine oil grade:
API service SG type or higher, JASO
standard MA
Engine oil quantity:
Oil change:2.40 L (2.54 US qt, 2.11 Imp.qt) With oil filter removal:
2.60 L (2.75 US qt, 2.29 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):
2.30 L (2.43 US qt, 2.02 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: 3.4 L (0.90 US gal, 0.75 Imp.gal)
Fuel injection:
Throttle body:
ID mark: BN64 20
Spark plu g(s):
Manufacturer/model:
NGK/CR10EK
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)
Clutch:
Clutch type:Wet, multiple-disc
Drivetrain:
Primary reduction ratio:
2.073 (85/41)
Final drive: Chain
Secondary reduction ratio: 2.813 (45/16)
Transmission type:
Constant mesh 6-speed
Gear ratio: 1st:
2.583 (31/12)
2nd: 2.000 (32/16)
3rd: 1.667 (30/18)
4th:
1.444 (26/18)
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