116

2

3

4

5

679

10 11 12

1314 15

8

17

14

Parts Diagram

RACE SERIES

Lot Number

Yoshimura Asia Co., Ltd. / Installation Instruction Manual

1905 GROM 180C-40A-51*0: P.1/5

HONDA GROM 2014~2016 / 2017~2019RACE SERIES FULL SYSTEM R-77S

121210U520 (SSC)121210U720 (STBC)

Qualified Manufacturer Declared “Modified Part”

FOR CLOSED COURSE COMPETITION ONLY; NOT INTENDED FOR STREET USE

No. Descriptions Part No. Q'ty No. Descriptions Part No. Q'ty 1011121314151617--

181-40A-5X01186C-40A-5W51

186C-40A-5W81B162-40R-G500896-016-0835161-40A-0210161-40A-0220805-208-5030800-206-4030812-108-2600

823-008-1250553-565-0000850-208-1212803-206-4015812-206-1310823-006-1000118-001-0000850-008-2604

--

Exhaust PipeSilencer Assy StainlessSilencer Assy Titanium BlueSilencer BandSilencer Band RubberSilencer Bracket #1Silencer Bracket #2Hex Head Flange Bolt M8x30Cap Bolt M6x30Washer M8x26

Flange Nut M8Grommet RubberGrommet SpacerButton Bolt M6x15SUS Washer M6Flange Nut M6Exhaust SpringSpacer 8-26-4Spring Puller ToolSticker

1

1

1111121

1112422112

1

2

3456789

Race Series systems are: • NOT CARB/EPA tail-pipe emissions compliant. • NOT street legal. • For “Closed Course Competition” use only. You must know how to remove and replace your stock exhaust in order to install this product otherwise have it installed by a professional mechanic. Keep all stock parts from your existing system as some components may be necessary to install your new Yoshimura exhaust depending on the application. Read through all instructions before beginning installation. Exhaust system can be extremely hot. Let motorcycle cool down before beginning installation. Always wear hand and eye protection and take precautionary measures to avoid injury.

NOTE: IN THE STATE OF CALIFORNIA, IT IS ILLEGAL TO MODIFY THE EMISSION CONTROL SYSTEM, WHICH INCLUDES THE CARBURETORS OF ANY VEHICLE.

This product was specially made for the U.S. market and was manufactured under quality control at Yoshimura factory.

GROM 180C-40A-51*0: P.2/5

Installation Procedure

Fig. 2Fig. 2

CAUTION

Fig. 1 Fig. 1

REFERENCE

Stock nut

Stock bolt

Loosen stock bolt and nut at right hand side foot peg bracket and pull out stock foot peg bracket from shaft for easier work. (See Fig. 2)

GROM 2016 and after only:Remove grommet rubber and grommet spacer from exhaust system mounting bracket. (See Fig. 2)

Check all the component parts are in hand.

According to Honda service manual, remove stock exhaust system. (See Fig. 1)

When removing stock exhaust system, be careful not to damage engine, swing arm or other components.

Stock nuts and bolt removed at this stage are reused when mounting Yoshimura exhaust system.

1)

2)

3)

4)

5)

6)

7)

Fig. 3Fig. 3

Fig. 8Fig. 5Fig. 4Fig. 4

Spacer 8-26-4

Stock bolt

Stock gasket

Exhaust Pipe

Exhaust pipe bracketExhaust Pipe

Stock nut

Sight from back

OutsideInside

Refer Fig. 8 for installation.

Bolt hole underneath engineRefer Fig. 8 for installation.

CAUTION Use Honda genuine new exhaust gasket.

CAUTION Be careful not to damage brake hose.

CAUTION Cover foot peg bracket with cloth to avoid making scratch at swing arm, frame or other component.

Replace stock gasket at exhaust port of engine with new one. Then mount Exhaust Pipe and tighten with stock nuts by hand only at this stage. (See Fig. 3)

Fix exhaust pipe bracket at bolt hole underneath engine with stock bolt and Spacer 8-26-4. Tighten bolt by hand only at this stage. (See Fig. 4 & 5)

Install Grommet Rubber and Grommet Spacer to Silencer Bracket #2. (See Fig. 6 on next page)

GROM 2016 and after only:Remove grommet rubber and grommet spacer from the bracket.

GROM 180C-40A-51*0: P.3/5

8)

9)

10)

11)

Fig. 9Fig. 9

Refer Fig. 10 for installation.

Exhaust Pipe

Silencer Assy

REFERENCE

Silencer BandSilencer Band Rubber

Fig. 10Fig. 10Silencer Band Rubber

Silencer Assy

Washer M6

Button BoltM6x15

Flange Nut M6

Silencer Band

Silencer Bracket #2

Mount Silencer Assy on Exhaust Pipe. (See Fig. 9)

Place Silencer Band Rubber inside Silencer Band, and slide them on Silencer Assy. Set Silencer Band position at 48mm from front edge of silencer sleeve, then fix Silencer Band on Silencer Bracket #2 with 2 of each Button Bolt M6x15, SUS Washer M6 and Flange Nut M6. (See Fig. 9 & 10) Tighten and torque 2 of Button Bolt M6x15.

CAUTION

CAUTION

Cut excess of Silencer Band Rubber with scissors etc. when placing it inside Silencer Band.

Be sure to place Silencer Band at right angles to Silencer Assy. If neglected, it may cause breakage to Silencer Band.

Before tighten Silencer Band, make sure silencer sleeve and Silencer Band fit evenly and there is no opening between them. If neglected, it may cause deformation of silencer sleeve.

OutsideInside

Fig. 5Fig. 8

Fig. 3Fig. 6

Sight from back

Silencer Bracket #1

Silencer Bracket #2

Washer M8x26

Grommet Rubber/Grommet Spacer

Hex Head FlangeBolt M8x30

Cap Bolt M6x30

SUS Washer M6

Flange Nut M8

Silencer Bracket #1

Fig. 7

SilencerBracket #1Cap Bolt M6x30

Rear brake mastercylinder

Mount Silencer Bracket #1 and Silencer Bracket #2 together with Hex Head Flange Bolt M8x30, Washer M8x26 and Flange Nut M8. Tighten bolt by hand only at this stage. (See Fig. 6)

Loosen 2 of stock bolt which are mounting rear brake master cylinder and mount it and Silencer Bracket #1 together with 2 of each Cap Bolt M6x30 and SUS Washer M6 at original position. Tighten and torque 2 of Cap Bolt M6x30. (See Fig. 7 & 8)

Cap Bolt M6x30 : 10Nm

CAUTION Torque specification must be followed.

Tightening Torque

Rear brake master cylinder

48mm

Button Bolt M6x15 : 10Nm

CAUTION Torque specification must be followed.

Tightening Torque

GROM 180C-40A-51*0: P.4/5

Fig. 11Fig. 11

Exhaust Pipe

Exhaust Spring

Silencer Assy

Fig. 12Fig. 12

Fig. 13Fig. 13

12)

13)

14)

15)

16)

Stock nut at exhaust portStock bolt at exhaust pipe bracketButton Bolt M6x15Hex Head Flange Bolt M8x55

: 15Nm: 23Nm: 10Nm: 23Nm

CAUTION Make sure that exhaust spring is hooked to installing tool firmly. If neglected, it may cause injury.

CAUTION Torque specification must be followed.

CAUTION Torque specification must be followed.

Install 2 of exhaust spring. (See Fig. 11)

According to Honda service manual, tighten and torque stock bolt and nut at right hand side foot peg bracket. (See Fig. 2)

Check that there are proper clearances between Yoshimura Exhaust System and other components, and adjust the position and angle of Silencer Assy. Then tighten and torque 2 of stock nut at exhaust port, stock bolt at exhaust pipe bracket, 2 of Button Bolt M6x15 at Silencer Band and Hex Head Flange Bolt M8x30 at Silencer Bracket in order. (See Fig. 12 & 13)

Tightening Torque

Warm-up engine, and inspect the exhaust leakage. Tighten all bolts and nuts further after engine is cooled down.

When cleaning silencer, use soft cloth with dish soap. Do not use metal polish or parts cleaner. If neglect, the paint of Emblem may come off or Titanium Blue color may tarnish.

CAUTION

It is recommended that whole Yoshimura exhaust system to be wiped down with dish soap to remove oil and fingerprints. This will prevent tarnishing of finish after the exhaust system is heated up.

GROM 180C-40A-51*0: P.5/5

REFERENCE Yoshimura recommends silencer inner wool replacement every 5,000km (3,000miles) in order to get Yoshimura exhaust performance fully. Climate, riding condition, and frequency of ride are direct contributing factors for inner wool worn out. Keeping high engine revolution also promotes further wool consumption.

Titanium Blue sleeve is colored by anodizing. Handle with care as the color may change. When cleaning silencer, use soft cloth with dish soap but do not use metal polish or chemical cleaner.

CAUTION

- CAUTIONS AFTER INSTALLATION -Check each bolt sometimes to see that there is no failure condition such as poor tightening.Quality control is implemented on all products. If, however, any defect or failure is found, please notify Yoshimura R&D Of America through the selling dealer. Necessary technical service or replacing of the product will be made.Due to improvement, the specifications and price of the product are subject to change without notice.For any information regarding this product, please address inquiries to Yoshimura R&D Of America, Inc. YOSHIMURA RESEARCH & DEVELOPMENT OF AMERICA, INC. 5420 DANIELS STREET STE A, CHINO CA., 91710 (800) 634-9166 · (909) 628-4722 · FAX (909) 591-2198 · www.yoshimura-rd.com

After Installation