2004 YAMAHA TTR90 lock

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Page 18 of 364

YAMAHA TTR90 2004  Owners Manual  
ILLUSTRATED SYMBOLS 
(Refer to the illustration) 
Illustrated symbols  
1  
 to   
6  
 are designed as
thumb tabs to indicate the chapter’s number
and content. 
1 
General information 
2 
Specifi

Page 32 of 364

YAMAHA TTR90 2004  Owners Manual  
1 - 4
GEN
INFO
 
IMPORTANT INFORMATION 
EC132000 
ALL REPLACEMENT PARTS 
1. We recommend to use Yamaha genuine
parts for all replacements. Use oil and/or
grease recommended by Yamaha for
assembly an

Page 50 of 364

YAMAHA TTR90 2004  Owners Manual 1 - 11
GEN
INFO
CONTROL FUNCTIONS
FUEL COCK
The fuel cock supplies fuel from the tank to
carburetor while filtering the fuel. The fuel cock
has the three positions:
OFF: With the lever in this positio

Page 63 of 364

YAMAHA TTR90 2004  Owners Manual SPEC
 
2 - 6 Stem runout limit ---- 0.02 mm
(0.0008 in)
Valve seat width IN 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
EX 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm
(0.0630 in)
Valve spring:
F

Page 67 of 364

YAMAHA TTR90 2004  Owners Manual SPEC
 
2 - 10 Part to be tightened Thread size Q’tyTightening torque
Nm m•kg ft•lb
Cylinder head nut M8  
×  
 1.25 4 22 2.2 16
Cylinder head bolt M6  
×  
 1.0 2 10 1.0 7.2
Spark plug M10

Page 70 of 364

YAMAHA TTR90 2004  Owners Manual SPEC
 
2 - 13
NOTE:
1. First, tighten the ring nut approximately 38 Nm (3.8 m • kg, 27 ft • lb) by using the ring nut
wrench and turn the steering right and left a few times; then loosen the ring

Page 110 of 364

YAMAHA TTR90 2004  Owners Manual  
2 - 18
SPEC
 
CABLE ROUTING DIAGRAM 
TT-R90 
1  
Crankcase breather hose  
2  
Wire harness  
3  
CDI magneto lead  
4 
Starter cable  
5 
Carburetor heating lead 
6 
Engine stop switch lead 
7 
The

Page 114 of 364

YAMAHA TTR90 2004  Owners Manual  
2 - 20
SPEC
 
Å 
Pass the fuel tank breather hose through the
cable guide. 
ı 
Pass the throttle cable and engine stop switch
lead through the cable guide. 
Ç 
Pass the air vent hose through the
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