Honda NSS250S User Manual

GENERAL INFORMATION
1-8
CYLINDER HEAD/VALVES SPECIFICATIONS
Unit: mm (in)
CYLINDER/PISTON SPECIFICATIONS
Unit: mm (in)
ITEM STANDARD SERVICE LIMIT
Cylinder compression 1,569 kPa (16.0 kgf/cm
2
, 228 psi) at
350 min
-1
(rpm)
–
Cylinder head warpage – 0.05 (0.002)
Camshaft Cam lobe height IN 39.285 – 39.525 (1.5467 – 1.5561) 39.235 (1.5447)
EX 36.944 – 37.234 (1.4545 – 1.4659) 36.944 (1.4545)
Valve clearance IN 0.16 ± 0.03 (0.006 ± 0.001) –
EX 0.22 ± 0.03 (0.009 ± 0.001) –
Rocker arm Rocker arm I.D. IN/EX 13.000 – 13.018 (0.5118 – 0.5125) 13.10 (0.516)
Rocker arm shaft O.D. IN/EX 12.966 – 12.984 (0.5105 – 0.5112) 12.91 (0.508)
Rocker arm-to-shaft clear-
ance
IN/EX 0.016 – 0.052 (0.0006 – 0.0020) 0.08 (0.003)
Side spring free length 17.1 (0.673) 15.5 (0.61)
Valve, valve
guide
Valve stem O.D. IN 4.475 – 4.490 (0.1762 – 0.1768) 4.465 (0.1758)
EX 4.465 – 4.480 (0.1758 – 0.1764) 4.455 (0.1754)
Valve guide I.D. IN/EX 4.500 – 4.512 (0.1772 – 0.1776) 4.54 (0.179)
Stem-to-guide clearance IN 0.010 – 0.037 (0.0004 – 0.0015) 0.08 (0.003)
EX 0.020 – 0.047 (0.0008 – 0.0019) 0.09 (0.004)
Valve guide projection
above cylinder head
IN 11.2 – 11.5 (0.44 – 0.45) –
EX 12.2 – 12.5 (0.48 – 0.49) –
Valve seat width IN/EX 0.90 – 1.10 (0.035 – 0.043) 1.5 (0.06)
Valve spring free length IN/EX 37.09 (1.460) 35.6 (1.40)
ITEM STANDARD SERVICE LIMIT
Cylinder I.D. 68.000 – 68.010 (2.6772 – 2.6776) 68.10 (2.681)
Out-of-round – 0.05 (0.002)
Taper – 0.05 (0.002)
Warpage – 0.05 (0.002)
Piston, piston
pin, piston
ring
Piston O.D. at 14 (0.6) from bottom 67.970 – 67.990 (2.6760 – 2.6768) 67.90 (2.673)
Piston pin hole I.D. 17.002 – 17.008 (0.6694 – 0.6696) 17.04 (0.671)
Piston pin O.D. 16.994 – 17.000 (0.6691 – 0.6693) 16.96 (0.668)
Piston-to-piston pin clearance 0.002 – 0.014 (0.0001 – 0.0006) 0.02 (0.001)
Piston ring end gap
Top 0.15 – 0.25 (0.006 – 0.010) 0.45 (0.018)
Second 0.30 – 0.45 (0.012 – 0.018) 0.65 (0.026)
Oil (side rail) 0.20 – 0.70 (0.008 – 0.028) 0.90 (0.035)
Piston ring-to-ring
groove clearance
Top 0.020 – 0.050 (0.0008 – 0.0020) 0.09 (0.004)
Second 0.015 – 0.045 (0.0006 – 0.0018) 0.085 (0.0033)
Cylinder-to-piston clearance 0.010 – 0.040 (0.0004 – 0.0016) 0.10 (0.004)
Connecting rod small end I.D. 17.010 – 17.028 (0.6697 – 0.6704) 17.05 (0.671)
Connecting rod-to-piston pin clearance 0.010 – 0.034 (0.0004 – 0.0013) 0.05 (0.002)
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Honda NSS250S Specifications

General

Brand	Honda
Model	NSS250S
Category	Scooter
Language	English