KEEWAY RKV125 User Manual

XII Cylinder Head/Valve
Preparatory data-----------------12.1 Valve guide replacement-------------12.5
Fault diagnosis------------------12.2 Valve race fixing and adjustment---12.6
Cylinder head--------------------12.3 Cylinder head installation------------12.7
Valve Inspection---------------- 12.4
12.1 Preparatory Data
Precautions on Operation
To ensure sealing between cylinder head and cylinder body, there is a great bolt pretension on the cylinder head.
Pretension value: 50Nm.
All the components shall be cleaned before inspection and test, and purged with high-pressure air.
Function of cylinder head: Cylinder head is used to seal cylinder and form a combustion chamber with piston to
hold high-temperature and high-pressure fuel gas. It accomplishes air intake and exhausting operation with valve
mechanism.
Basic Data Unit: mm
Item
Standard
Service
Limit
Cylinder cover flatness
0.03
0.05
Valve
Valve guide
Valve clearance
Intake
0.03-0.05
＿
Exhaust
0.03-0.05
＿
Valve stem OD
Intake
4.97-4.98
4.9
Exhaust
4.96-4.97
4.9
Valve guide ID
Intake
5 -5.012
5.1
Exhaust
5-5.012
5.1
Clearance between valve stem and valve guide
Intake
0.02-0.042
0.08
Exhaust
0.03-0.052
0.10
Valve race width
Intake/Exhaust
0.7
1.5
Valve
spring
Rocker arm
Clearance
Rocker arm shaft OD
38.8
37.8
Intake/Exhaust
11.980-11.988
11.95
Valve
Valve guide
Rocker arm hole ID
Intake/Exhaust
12-12.012
12.05
Clearance between rocker arm shaft and rocker arm
hole
Intake/Exhaust
0.012-0.032
0.08

KEEWAY RKV125 Specifications

General

Engine Type	Single cylinder, 4-stroke, air-cooled
Fuel System	Carburetor
Transmission	5-speed
Front Suspension	Telescopic fork
Front Brake	Disc
Rear Brake	Drum
Cooling System	Air-cooled
Seat Height	770 mm
Weight	135 kg
Fuel Tank Capacity	17 L
Rear Suspension	Dual shock absorbers