Honda 650 88-89, NX 650 88-89 Service Manual F Section 6 Cylinder head valves
Specifications and Main Features
- Cylinder pressure level: 10.5 – 12.5 kg/cm² (149.31 – 177.75 psi)
- Technical specifications of camshaft:
- IN: 31.156 – 31.315 mm, (1.2266 – 1.2329 inches), Service limit: 31.05 mm (1.222 inches)
- EX: 31.091 – 31.251 mm (1.2241 – 1.2304 ), Service limit: 31.00 mm (1.220 )
- Preceeding ’88 year Camshaft Parameters :
- IN: 31.101 – 31.341 mm (1.2244 – 1.23339 inches), Service limit: 30.48 mm (1.200 inches)
- EX: 31.072 – 31.312 mm (1.2233 – 1.2328 inches), Service limit: 30.45 mm (1.199 inches)
- Rocker arm parameters:
- I.D.: 11,500 – 11618 mm (0.4528 – 0.4535 ) Service limit: 11.55 mm (0.455 )
- Sub-rocker arm I.D. parameters:
- IN: 8.000 – 8.015 mm (0.3150 – 0.3156 inches), Service limit: 8.05 mm (0.317 inches)
- EX: 7.000 – 7.015 mm (0.2756–0.2762 inches), Service limit: 7.05 mm (0.278 )
- Free length of valve spring:
- Inner: 35.1 mm (1.38 inches), Service limit: 34.1 mm (1.34 inches)
- Outer: 36 mm (1.42 inches) Service limit: 35.0 mm (1.38 inches)
- Torque Parameters:
- Cylinder head bolt: 36 N-m (3.6 kg-m, 26 ft-lb)
- Cam sprocket bolt: 20 N-m (2.0 kg-m, 14 ft-lb)
- Rocker arm shaft: 28 N-m (2.8 kg-m, 20 ft-lb)
- Cylinder head cover bolt (8 mm): 23 N-m (2.3 kg-m, 17 ft-lb)
- Spark plug: 18 N-m (1.8 kg-m, 13 ft-lb)
Frequently Asked Questions
- What is the cylinder head compression ratio in the device?
- The recommended cylinder head compression ratio is 10.5-12.5 kg/cm² (149.31-177.75 psi).
- How can I increase the compression if it is decreasing?
- Decrease in compression may be caused by faulty valve setting, burned or misaligned valves, valve idle angles misalignment, defective or broken valve springs or leaky, broken head gaskets.
- What is the torque range for the bolts securing the cylinder head?
- The torque range for the bolts of the cylinder head is 36 N-m (3.6 kg-m, 26 ft-lb).
- Is it necessary to check the rocker arms and how frequently?
- Yes, they should be examined periodically because the arms have a tendency to wear out or get damaged, particularly where servicing or replacement of rocker arms is involved.
- What is the maximum service length for the inner spring of a valve?
- The maximum service length for the inner spring of a valve is 34.1MM (1.34 inchs).
User Manual
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