Adjusting The Exhaust Gas Volume; Checking The Air Induction System; Replacing The Air Filter Element - Yamaha YZF-R1 2020 Service Manual

• Canister purge hose
• Fuel tank breather hose
Cracks/damage → Replace.
Loose connection → Connect properly.
TIP
Make sure that the canister breather "a" is not
blocked, and if necessary, clean it.
3. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
EAS30799

ADJUSTING THE EXHAUST GAS VOLUME

TIP
• Be sure to set the CO density level to standard,
and then adjust the exhaust gas volume.
• To adjust the exhaust gas volume, use the CO
adjustment mode of the Yamaha diagnostic
tool. For more information, refer to the opera-
tion manual of the Yamaha diagnostic tool.
1. Connect the Yamaha diagnostic tool to the
coupler. For information about connecting the
Yamaha diagnostic tool, refer to "YDT" on
page 9-2.
Yamaha diagnostic tool USB
90890-03267
Yamaha diagnostic tool (A/I)
90890-03264
TIP
• Yamaha diagnostic tool (A/I) (90890-03264) in-
cludes YDT sub harness (6P) (90890-03266).
• If you already have Yamaha diagnostic tool (A/
I) (90890-03262), YDT sub harness (6P)
(90890-03266) is separately required.
1 1 1
a a
PERIODIC MAINTENANCE
EAS30627

CHECKING THE AIR INDUCTION SYSTEM

Refer to "AIR INDUCTION SYSTEM" on page
7-19.
EAS30628

REPLACING THE AIR FILTER ELEMENT

1. Remove:
• Rider seat
Refer to "GENERAL CHASSIS (1)" on page
4-1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
2. Remove:
• Air filter case cover
• Air filter element
Refer to "AIR FILTER CASE" on page 7-5.
3. Check:
• Air filter element
• Air filter seal
Damage → Replace.
TIP
• Replace the air filter element every 40000 km
(24000 mi) of operation.
• The air filter needs more frequent service if you
are riding in unusually wet or dusty areas.
4. Install:
• Air filter element
• Air filter case cover
ECA20710
NOTICE
Never operate the engine without the air filter
element installed. Unfiltered air will cause
rapid wear of engine parts and may damage
the engine. Operating the engine without the
air filter element will also affect throttle body
synchronization, leading to poor engine per-
formance and possible overheating.
TIP
• Align projections "a" of the air filter element to
the slots "b" of the air filter case and install.
• When installing the air filter element into the air
filter case, make sure that the sealing surfaces
are aligned to prevent any air leaks.
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