Checking The Primary Injectors (Before Removing); Checking The Primary Injectors; Checking And Cleaning The Throttle Bodies - Yamaha YZF-R1(B) 2012 Service Manual

EAS14B1108

CHECKING THE PRIMARY INJECTORS

(BEFORE REMOVING)
1. Check:
• Injectors
Use the diagnostic code number "D:36–
D:39".
Refer to "DIAGNOSTIC MODE" on page
8-38.
EAS14B1109
REMOVING THE PRIMARY INJECTORS
EWA14B1028
WARNING
• Check the injectors in a well-ventilated
area free of combustible materials. Make
sure that there is no smoking or use of
electric tools in the vicinity of the injec-
tors.
• Be careful when disconnecting the fuel
hoses. Any remaining pressure in the fuel
hoses may cause the fuel to spray out.
Place a container or rag under the hoses
to catch any fuel that spills. Always clean
up any spilt fuel immediately.
• Turn the main switch to "OFF" and dis-
connect the negative battery lead from
the battery terminal before checking the
injectors.
1. Remove:
• Fuel tank
• Fuel hoses
• Air filter case
• Throttle bodies
2. Remove:
• Sub-wire harness
• Primary injectors
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the fuel rail screws "1" as shown.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
3. Remove:
• Fuel rails "1"
• Primary injector joint "2"
EAS14B1110
CHECKING THE PRIMARY INJECTORS
1. Check:
• Injectors
Obstruction → Replace and check the
fuel pump/fuel supply system.
Deposit → Replace.
Damage → Replace.
2. Check:
• Injector resistance
Refer to "CHECKING THE FUEL INJEC-
TORS" on page 8-148.
EAS14B1072
CHECKING AND CLEANING THE THROT-
TLE BODIES
TIP
Before cleaning the throttle bodies, check the
following items:
• Valve clearance
• Spark plugs
• Air filter element
• Throttle body joints
• Fuel hoses
• Air induction system
• Exhaust system
• Breather hoses
• Vacuum hose
EWA14B1021
WARNING
• If the throttle bodies are subjected to
strong shocks or dropped during clean-
ing, replace them as a set.
• Before removing the throttle bodies to
clean them, check the operation of the
throttle bodies, refer to "FUEL INJECTION
SYSTEM" on page 8-33.
1. Check:
• Throttle bodies
Cracks/damage → Replace the throttle
bodies as a set.
7-15
THROTTLE BODIES