NOTE
Use the battery which is fully charged.
Special Tools - Compression Gauge, 20 kgf/cm²: 57001-221 Compression Gauge Adapter, M10 × 1.0: 57001-1601 L-Shape Hose [C]: 57001-1606
Cylinder Compression
Usable Range: 1 099 
1 668 kPa (11.2
17.0 kgf/cm²,
159 
242 psi) at 320 r/min (rpm)
The following table should be consulted if the obtainable compression reading is not within the usable range.
| Problem | Diagnosis | Remedy (Action) |
| Cylinder compression is higher than usable range | Carbon accumulation on piston and in combustion chamber possibly due to damaged valve stem oil seal and/or damaged piston oil rings (This may be indicated by white exhaust smoke). | Remove the carbon deposits and replace damaged parts if necessary. |
| Incorrect cylinder head gasket thickness | Replace the gasket with a standard part. | |
| Cylinder compression is lower than usable range | Gas leakage around cylinder head | Replace damaged gasket and check cylinder head warp |
| Bad condition of valve seating | Repair if necessary. | |
| Incorrect valve clearance | Adjust the valve clearance. | |
| Incorrect piston/cylinder clearance | Replace the piston and/or cylinder. | |
| Piston seizure | Inspect the cylinder and replace/repair the cylinder and/or piston as necessary. | |
| Bad condition of piston ring and/or piston ring grooves | Replace the piston and/or the piston rings. |
Cylinder Head
Cylinder Head RemovalTransmission Assy Installation
Assemble the transmission assy (see Transmission Assy
Assembly).
Be sure that the dowel pins are in position.
Install the transmission assy on the crankcase.
Tighten:
Torque - Transmission Case Bolts: 20 N·m (2.0 kgf·m, 15
ft·lb)
Install:
Shift Shaft (see External Shift Mechani ...
Rear Wheel Rotation Sensor Signal Abnormal (Service Code b 44)
Measure the air gap between the rear wheel rotation sensor
and sensor rotor.
Thickness Gauge [A]
Air Gap
Standard: 0.4 1.6 mm (0.02
0.06 in.)
If the measurement is not the standard, check each part
for deformation and looseness and correct accordingly.
If the measurement is the sta ...
Piston Ring Groove Width Inspection
Measure the piston ring groove width.
Use a vernier caliper at several points around the piston.
Piston Ring Groove Width
Standard:
Top [A] 0.82 0.84 mm (0.0323
0.0331 in.)
Second [B] 0.82 0.84 mm
(0.0323 0.0331 in.)
Service Limit:
0.92 mm (0.036 in.)
Second 0.92 mm (0.036 in.)
...