Yamaha YP125R, Service Manual

Page: 85 / 498

ENGINE SPECIFICATIONS (YP250R)
2-54
Clutch shoe spring free length 40.5 mm (1.59 in)
Clutch housing inside diameter 145.0 mm (5.71 in)
Limit 145.5 mm (5.73 in)
Compression spring free length 102.4 mm (4.03 in)
Limit 90.0 mm (3.54 in)
Weight outside diameter 20.0 mm (0.79 in)
Limit 19.5 mm (0.77 in)
Clutch-in revolution 2100–2700 r/min
Clutch-stall revolution 3650–4650 r/min
V-belt
V-belt width 23.0 mm (0.91 in)
Limit 21.0 mm (0.83 in)
Transmission
Transmission type V-belt automatic
Primary reduction system Helical gear
Primary reduction ratio 40/15 (2.666)
Secondary reduction system Helical gear
Secondary reduction ratio 40/14 (2.857)
Operation Centrifugal automatic type
Gear ratio 2.440–0.830 :1
Air filter
Air filter element Oil-coated paper element
Fuel pump
Pump type Electrical
Output pressure 250.0 kPa (2.50 kgf/cm², 36.3 psi)
Fuel injector
Model/quantity 1C04/1
Throttle body
Type/quantity EFI 1C04/1
ID mark 1C04 00
Throttle position sensor
Input voltage (at idle) 5 V
Output voltage (at idle) 0.40–0.90 V
Fuel injection sensor
Crankshaft position sensor resistance 248–372
Ω
at 20 °C (68 °F)
Intake air pressure sensor output voltage 3.57–3.71 V
Intake air temperature sensor resistance 2.21–2.69 k
Ω
at 20 °C (68 °F)
Coolant temperature sensor resistance 2.32–2.59 k
Ω
at 20 °C (68 °F)
310–326
Ω
at 80 °C (176 °F)
Idling condition
Engine idling speed 1450–1650 r/min
CO% (muffler tailpipe) 0.3–0.7%
Intake vacuum 39.0–45.0 kPa (293–338 mmHg, 11.5–13.3
inHg)