2001 YAMAHA TTR90 length

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Page 8 of 288

YAMAHA TTR90 2001  Owners Manual  
4. When transporting the machine in
another vehicle, be sure is kept
upright and that the fuel cock is
turned to the “OFF”. If it should lean
over, gasoline may leak out of the car-
buretor or f

Page 52 of 288

YAMAHA TTR90 2001  Owners Manual GEN
INFO
1 - 12
STARTING AND OPERATION
STARTING AND OPERATION
CAUTION:
Prior to operating the machine, perform
steps listed in pre-operation check list.
WARNING
Never start your engine or let it run f

Page 56 of 288

YAMAHA TTR90 2001  Owners Manual SPEC
 
2 - 1 
EC200000 
SPECIFICATIONS 
EC211000 
GENERAL SPECIFICATIONS 
Model name: TT-R90N
(USA-except for California, CDN, AUS, NZ)
TT-R90NC (USA for California)
TT-R90 (Europe)
Model code number:

Page 61 of 288

YAMAHA TTR90 2001  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:

Page 63 of 288

YAMAHA TTR90 2001  Owners Manual SPEC
 
2 - 8 
Crankshaft:
Crank width “A” 42.95 ~ 43.00 mm
(1.691 ~ 1.693 in)----
Runout limit C ---- 0.03 mm 
(0.0012 in)
Big end side clearance “D” 0.10 ~ 0.40 mm
(0.0039 ~ 0.0157 in)0.50 mm

Page 66 of 288

YAMAHA TTR90 2001  Owners Manual SPEC
 
2 - 11 
CHASSIS 
Item Standard Limit
Steering system:
Steering bearing type Angular bearing ----
Front suspension:
Front fork travel 110 mm (4.33 in) ----
Fork spring free length 425.1 mm (16.7

Page 67 of 288

YAMAHA TTR90 2001  Owners Manual SPEC
 
2 - 12 
Drum brake:
Front drum brake type Leading, trailing ----
Rear drum brake type Leading, trailing ----
Front drum inside diameter 95 mm (3.74 in) 96 mm (3.78 in)
Rear drum inside diameter

Page 70 of 288

YAMAHA TTR90 2001  Owners Manual  
2 - 15
SPEC
 
GENERAL TORQUE SPECIFICATIONS/
DEFINITION OF UNITS 
EC220001 
GENERAL TORQUE 
SPECIFICATIONS 
This chart specifies torque for standard fasten-
ers with standard I.S.O. pitch threads. T
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