Tune-Up Specifications - Honda CB350 Repair Manual

TUNE—UP 39
plug more than one step hotter than the
recommended plug be fitted.
If the machine is used primarily for
high—speed touring or the like, it may
benefit from the installation ofa plug one
heat range colder than normal. This will
allowthe plug tip temperature to remain
in the safe zone even when the engine is
under heavy loads. The chief disadvan—
tage ofthe colder plug is that it may cause
the engine to load up at low speeds.
Because most popular plugs in use
today are designed to meet a variety of
conditions, (i.e., they are wide heat range
plugs), most riders will find that the stan—
dard plug will work with no trouble.
Tune—Up Specifications
350 360
ENGINE
Valve Clearance (cold)
Intake (in./mm) 0.002/0.05 0.002/0.05
Exhaust (in./mm) s 0.004/0.10 doar ...
Compression $
Pressure (psi) 170 £. 170 12. &
Maximum variation (psi) 15 15 £
IGNITION +7 I
Spark plugs
Standard makes ® NCK/ND NGK/ND
j Type: standard B8ES/W24ES BSES/W24ES
cold BoES/wark BOES/W27rE
hot BTES/W22ES BTES/W22ES 4,
Gap (in./mm) 0.028—0.032/0.7—0.8 0.028—0.032/0.7—0.8
p ant ms
Point gap (in./mm) 0.012—0.016/0.3—0.4 0.012—0.016/0.3—0.4
Maximum advance (deg @ rpm) ** 27°—33° @ 3000 NA
CARBURETION W a"
Idle speed (rpm) 1100 p 1200
Pilot screw opening B4—1 1 % 21
Vacuum range, (in./ecm Hg) ———
Uniformity (in./cm Hg) mm
6.2—9.5/16—24
0.78/2.0
* Other reputable makes are also acceptable. Be sure to select plugs of the proper heat
range, reach, and diameter.
** Includes initial (static) advance
——— Not applicable
NA Not available