Yamaha YFM90RA Model Vehicle User Manual


 
2 - 4
SPEC
ENGINE SPECIFICATIONS
EBS01002
ENGINE SPECIFICATIONS
Item Standard Limit
Cylinder head
Warp limit 0.05 mm
(0.002 in)
Cylinder
Bore size 47.000 ~ 47.010 mm
(1.8504 ~ 1.8508 in)
7.00 ~ 7.40 cm
3
(0.43 ~ 0.45 cu.in)
47.10 mm
(1.8543 in)
Taper limit ---- 0.05 mm
(0.002 in)
Maximum out-of-round ---- 0.01 mm
(0.0004 in)
Camshaft
Drive method Chain drive (Left) ----
Cam dimensions
Intake “A” 25.683 ~ 25.843 mm
(1.0111 ~ 1.0174 in)
25.583 mm
(1.0072 in)
“B” 20.985 ~ 21.015 mm
(0.8262 ~ 0.8274 in)
20.886 mm
(0.8223 in)
Exhaust “A” 25.525 ~ 25.685 mm
(1.0049 ~ 1.0112 in)
25.425 mm
(1.0010 in)
“B” 20.985 ~ 21.015 mm
(0.8262 ~ 0.8274 in)
20.886 mm
(0.8223 in)
Camshaft runout limit ---- 0.03 mm
(0.0012 in)
Timing chain
Timing chain type/No. of links KMC 92 RH 2005 / 86 ----
Timing chain adjustment method Automatic ----
A
B