Yamaha R1 Series 2015, Service Manual

Page: 465 / 704

THROTTLE BODIES
7-12
EAS31666
CHECKING THE PRIMARY INJECTORS
(BEFORE REMOVING)
1. Check:
• Injectors
Use the diagnostic code numbers “36”–“39”.
Refer to “SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE (ECU)” on
page 9-5.
EAS31667
REMOVING THE PRIMARY INJECTORS
WARNING
EWA17330
• 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 injectors.
• Be careful when disconnecting the fuel
hose. Any remaining pressure in the fuel
hose may cause the fuel to spray out. Place
a container or rag under the hose to catch
any fuel that spills. Always clean up any
spilt fuel immediately.
• Turn the main switch to “OFF” and discon-
nect the negative battery lead from the bat-
tery terminal before removing the injectors.
1. Remove:
•
Fuel rail “1”
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Remove the fuel rail screws “2”.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
EAS31668
CHECKING THE PRIMARY INJECTORS
1. Check:
• Injectors
Obstruction
o
Replace and check the fuel
pump/fuel supply system.
Deposit
o
Replace.
Damage
o
Replace.
2. Check:
• Injector resistance
Refer to “CHECKING THE FUEL INJEC-
TORS” on page 8-196.
EAS30769
CHECKING AND CLEANING THE THROTTLE
BODIES
TIP
Clean the throttle bodies only if they cannot be
synchronized using the bypass air screws. Be-
fore cleaning the throttle bodies, check the fol-
lowing items:
•
Valve clearance
• Spark plugs
•
Air filter element
• Throttle body joints
•
Fuel hoses
• Air induction system
•
Exhaust system
• Crankcase breather hose
•
Vacuum hose
WARNING
EWA17340
If the throttle bodies are subjected to strong
shocks or dropped during cleaning, replace
them as a set.
1. Check:
•
Throttle bodies
Cracks/damage
o
Replace the throttle bod-
ies as a set.
2. Clean:
•
Throttle bodies
NOTICE
ECA21540
• Observe the following precautions; other-
wise, the throttle bodies may not operate
properly.
• Do not subject the throttle bodies to exces-
sive force.
• Clean the throttle bodies in the recom-
mended cleaning solvent.
• Do not use any caustic carburetor cleaning
solution.
• Do not apply cleaning solvent directly to
any plastic parts, sensors, or seals.
• Be careful not to remove the white paint
mark that identifies the standard throttle
body.
• Do not turn the bypass air screws “a”; oth-
erwise, the throttle body synchronization
will be affected.
1
2
2
Recommended cleaning solvent
Yamaha Oil & Brake Cleaner