Yamaha TT-R90E User Manual

SPEC
2 - 4
MAINTENANCE SPECIFICATIONS
ENGINE
Item Standard Limit
Cylinder head:
Warp limit ---- 0.03 mm
(0.0012 in)
Cylinder:
Bore size 47.000 ~ 47.005 mm
(1.8504 ~ 1.8506 in)
47.05 mm
(1.8524 in)
Out of round limit ---- 0.05 mm
(0.0020 in)
Camshaft:
Drive method Chain drive (left) ----
Cam dimensions
Intake “A” 25.428 ~ 25.528 mm
(1.0011 ~ 1.0050 in)
25.400 mm
(1.0000 in)
“B” 21.034 ~ 21.134 mm
(0.8281 ~ 0.8320 in)
21.000 mm
(0.8268 in)
Exhaust “A” 25.286 ~ 25.386 mm
(0.9955 ~ 0.9994 in)
25.260 mm
(0.9945 in)
“B” 21.047 ~ 21.147 mm
(0.8286 ~ 0.8326 in)
21.017 mm
(0.8274 in)
Camshaft runout limit ---- 0.03 mm
(0.0012 in)
MAINTENANCE SPECIFICATIONS

Yamaha TT-R90E Specifications

General

Displacement	89 cc
Ignition System	CDI
Final Drive	Chain
Starter	Electric
Engine Type	SOHC, air-cooled, 4-stroke
Bore x Stroke	47.0 mm x 48.0 mm
Transmission	5-speed
Front Suspension	telescopic fork
Rear Suspension	Swingarm
Front Brake	Drum brake
Rear Brake	Drum brake
Wet Weight	161 lb
Curb Weight	143 lbs
Fuel System	Mikuni VM13 carburetor