clutch YAMAHA TTR90 2006 User Guide

4 - 28
ENGCLUTCH
CLUTCH
Extent of removal:
1 Friction plate and clutch plate removal
2 Clutch housing removal
3 Primary clutch removal
Extent of removal Order Part name Q’ty Remarks
CLUTCH REMOVAL
1 Bolt/clutch spring 4/4
2 Pressure plate 1
3 Washer 1
4 Push rod #1 1
5 Friction plate 5
6 Clutch plate 4
7 Push rod #2 1
8 Clutch boss nut 1
Use special tool.
Refer to “REMOVAL POINTS”. 9 Lock washer 1
10 Clutch boss 1
11 Washer 1
12 Clutch housing 1
2
1
3

4 - 29
ENGCLUTCH
Extent of removal Order Part name Q’ty Remarks
13 Spacer 1
14 Spacer 1
15 Primary clutch nut 1 Use special tool.
Refer to “REMOVAL POINTS”.
16 Washer 1
17 Spacer 1
18 Primary clutch housing 1
19 Primary clutch boss 1
20 Clutch carrier 1
21 One-way clutch assembly 1
22 Washer 1
3
2

4 - 30
ENGCLUTCH
REMOVAL POINTS
Clutch boss
1. Remove:
Clutch boss nut 1
Lock washer 2
Clutch boss
NOTE:
Straighten the lock washer tab and use the
clutch holding tool 3 to hold the clutch boss.
ÈFor USA and CDN
ÉExcept for USA and CDN
Clutch holding tool:
YM-91042/90890-04086ÈÉ
Primary clutch
1. Remove:
Primary clutch nut 1
NOTE:
Loosen the nut while holding the magneto
rotor with the sheave holder 2.
INSPECTION
EC484500
Friction plate
1. Measure:
Friction plate thickness
Out of specification → Replace friction
plate as a set.
Measure at all four points.
Sheave holder:
YS-1880-A/90890-01701
Friction plate thickness:
Standard Limit
2.7 ~ 2.9 mm
(0.106 ~ 0.114 in)2.6 mm
(0.102 in)

4 - 31
ENGCLUTCH
EC484600
Clutch plate
1. Measure:
Clutch plate warpage
Out of specification → Replace clutch
plate as a set.
Use a surface plate 1 and thickness
gauge 2.
EC484400
Clutch spring
1. Measure:
Clutch spring free length a
Out of specification → Replace springs
as a set.
Push rod
1. Measure:
Push rod #2 bend
Out of specification → Replace.
Warp limit:
0.2 mm (0.008 in)
Clutch spring free length
Standard Limit
26.2 mm (1.03 in) 24.2 mm (0.95 in)
Bending limit:
0.5 mm (0.02 in)
Primary clutch
1. Measure:
Primary clutch housing inside diameter
Out of specification → Replace.
Primary clutch housing inside
diameter:
105 mm (4.13 in)
: 106 mm (4.17 in)
2. Measure:
Clutch shoe groove depth a
Out of specification → Replace.
Clutch shoe groove depth:
1.0 ~ 1.3 mm (0.039 ~ 0.051 in)
: 0.1 mm (0.004 in)

4 - 32
ENGCLUTCH
ASSEMBLY AND INSTALLATION
Primary clutch
1. Install:
Washer 1
Nut (primary clutch) 2
NOTE:
Tighten the nut while holding the magneto
rotor with the sheave holder 3.
Clutch
1. Install:
Lock washer 1
Nut (clutch boss) 2
NOTE:
Use the clutch holding tool 3 to hold the clutch
boss.
ÈFor USA and CDN
ÉExcept for USA and CDN
2. Bend:
Lock washer tab
Sheave holder:
YS-1880-A/90890-01701
Clutch holding tool:
YM-91042/90890-04086
T R..50 Nm (5.0 m · kg, 36 ft · lb)
New
T R..70 Nm (7.0 m · kg, 50 ft · lb)
ÈÉ
Clutch release adjustment
1. Adjust:
Clutch release
Adjustment steps:
Loosen the locknut 1.
Turn in the adjuster 2 until it is lightly
seated.
Turn out by 1/8 turn.
Tighten the locknut.
T R..
Locknut:
8 Nm (0.8 m  kg, 5.8 ft  lb)

4 - 33
ENGKICK AXLE
KICK AXLE
Extent of removal:
1 Kick axle removal
2 Kick axle disassembly
Extent of removal Order Part name Q’ty Remarks
KICK AXLE REMOVAL AND
DISASSEMBLY
Preparation for removal Crankcase cover (right) Refer to “CLUTCH” section.
1 Kick axle assembly 1
2 Circlip 2
3 Spring cover 1
4 Torsion spring 1
5 Spring guide 1
6 Circlip 1
7 Ratchet wheel 1
8Clip 1
9 Circlip 1
10 Washer/wave washer 1/1
11 Kick gear 1
12 Kick axle 1
2
1

4 - 34
ENGSHIFT SHAFT
SHIFT SHAFT
Extent of removal:
1 Shift shaft removal
Extent of removal Order Part name Q’ty Remarks
SHIFT SHAFT REMOVAL
Preparation for removal Clutch housing and clutch carrier Refer to “CLUTCH” section.
1 Shift fork guide bar 1
2 Shift arm 3 1
3 Plate washer 1
4 Compression spring 1
5 Shift guide 1
6 Ball holder 1
7Guide 1
8 Dowel pin 1
9 Plate washer 1
10 Thrust bearing 1
11 Circlip 1
12 Shift lever assembly 1
13 Shift shaft 1
1

4 - 36
ENGOIL PUMP
OIL PUMP
Extent of removal:
1 Oil pump removal
2 Oil strainer removal
3 Oil pump disassembly
Extent of removal Order Part name Q’ty Remarks
OIL PUMP REMOVAL AND DIS-
ASSEMBLY
Preparation for removal Clutch housing and clutch carrier Refer to “CLUTCH” section.
Shift shaft Refer to “SHIFT SHAFT” section.
1 Rotary filter 1
2 Oil pump assembly 1
3 Gasket 1
4 Oil pump drive gear 1
5 Oil strainer 1
6 Circlip 1
7 Oil pump driven gear 1
8 Spring washer 1
9 Circlip 1
10 Washer 1
2
1
3

4 - 39
ENG
CDI MAGNETO (TT-R90)
Extent of removal:
1 Pickup coil/stator assembly removal
2 Rotor removal
Extent of removal Order Part name Q’ty Remarks
CDI MAGNETO AND STATOR
REMOVAL
Preparation for removal Fuel tank
Crankcase cover (left) Refer to “CLUTCH” section.
1 CDI magneto coupler 1
2 Pickup coil/stator assembly 1
3 Rotor nut 1
Use special tool.
Refer to “REMOVAL POINTS”. 4 Rotor 1
5 Woodruff key 1
2
1
CDI MAGNETO (TT-R90)

4 - 41
ENGCDI MAGNETO AND STARTER CLUTCH (TT-R90E)
CDI MAGNETO AND STARTER CLUTCH (TT-R90E)
Extent of removal:
1 Pickup coil/stator removal
2 Rotor removal
3 Starter clutch/wheel gear removal
Extent of removal Order Part name Q’ty Remarks
CDI MAGNETO AND STATOR
REMOVAL
Preparation for removal Fuel tank
Crankcase cover (left) Refer to “CLUTCH” section.
1 CDI magneto coupler 1
2 Pickup coil/stator assembly 1
3 Rotor nut 1
Use special tool.
Refer to “REMOVAL POINTS”. 4 Rotor 1
5 Woodruff key 1
6Shaft 1
7 Idler gear 1
8 Starter clutch/wheel gear 1/1
2
1
3