Suzuki DF 25, Service Manual, Page: 14 / 148

1-10 GENERAL INFORMATION
* SERVICE DATA
* These service data are subject to change without notice.
POWER HEAD
* Figures shown are guidelines only, not absolute service limit.
CARBURETOR
CYLINDER HEAD/CAMSHAFT
Item Unit
Data
DF2.5
Recommended operating
range
r/min 5 250 – 5 750
Idle speed r/min 1 900 ± 100 (in-gear: approx. 1 500)
* Cylinder compression kPa
(kg/cm
2
, psi)
960 – 1 400 (9.6 – 14.0, 137 – 199)
Engine oil API classification SE, SF, SG, SH, SJ
Viscosity rating
SAE 10W-40
Engine oil amounts L (US/lmp. qt) 0.38 (0.40/0.33)
Thermostat operating
temperature
°C (°F) 48 – 52 (118 – 126)
Type Walbro LMJ-26
I.D mark 97J10
Main jet # 70
Pilot jet # 32
Pilot screw Turns open Pre-set
Float height mm 10 ± 2
Cylinder head
distortion
Limit mm (in) 0.05 (0.002)
Cam
height
IN,
EX
STD mm (in) 28.480 – 28.680 (1.1213 – 1.1291)
Limit mm (in) 28.180 (1.1094)
Rocker
arm shaft
hole
diameter
IN
STD mm (in) 4.015 – 4.027 (0.1581 – 0.1585)
EX
Rocker
arm shaft
outside
diameter
IN
STD mm (in) 3.990 – 4.005 (0.1571 – 0.1577)
EX