Yamaha 2009 YFM25RY Service Manual page 28

Carburetor
ID mark
Main jet
Main air jet
Jet needle
Needle jet
Pilot air jet 1
Pilot air jet 2
Pilot outlet
Pilot jet
Bypass 1
Bypass 2
Bypass 3
Valve seat size
Starter jet 1
Starter jet 2
Throttle valve size
Float height
Idling condition
Engine idling speed
CO%
Intake vacuum
Oil temperature
Oil pump
Oil pump type
Inner-rotor-to-outer-rotor-tip clearance
Limit
Outer-rotor-to-oil-pump-housing clearance
Limit
Oil-pump-housing-to-inner-and-outer-rotor
clearance
Limit
Oil pressure (hot)
Pressure check location
ENGINE SPECIFICATIONS
4D31 00
#133.8
#140
5DH66-1
P-0M (922)
#85
#170
0.9
#25
0.8
0.8
0.8
2
#55
0.5
#100
13.0 mm (0.51 in)
1500–1600 r/min
4.0–5.0%
34.0 kPa (255 mmHg, 10.0 inHg)
55.0–65.0 °C (131.0–149.0 °F)
Trochoid
0.15 mm (0.0059 in)
0.23 mm (0.0091 in)
0.100–0.151 mm (0.0039–0.0059 in)
0.22 mm (0.0087 in)
0.04–0.09 mm (0.0016–0.0035 in)
0.16 mm (0.0063 in)
3.0 kPa/1550 r/min (0.03 kgf/cm
0.4 psi/1550 r/min)
Cylinder head
2-9
2
/1550 r/min,