Yamaha TTR90(M), Owner'S Service Manual

Page: 59 / 287

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 ---- 0.03 mm
(0.001 in)
Camshaft:
Drive method Chain drive (left) ----
Cam dimensions
Intake “A” 25.428 ~ 25.528 mm
(1.0011 ~ 1.0050 in) 25.4 mm
(1.00 in)
“B” 21.034 ~ 21.134 mm
(0.8281 ~ 0.8320 in) 21.0 mm
(0.83 in)
“C” 4.328 ~ 4.628 mm
(0.1704 ~ 0.1822 in) ----
Exhaust “A” 25.286 ~ 25.386 mm
(0.9955 ~ 0.9994 in) 25.26 mm
(0.99 in)
“B” 21.047 ~ 21.147 mm
(0.8286 ~ 0.8326 in) 21.017 mm
(0.83 in)
“C” 4.186 ~ 4.486 mm
(0.1648 ~ 0.1766 in) ----
Camshaft runout limit ---- 0.03 mm
(0.0012 in)
C
A
B
MAINTENANCE SPECIFICATIONS