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CG125 (1976-1991)
Инструкция по эксплуатации Страница: 10

Honda CG125 (1976-1991) [10/128] Clean the air filter

Routine maintenance

capacity and place it beneath the engine unit to catch the old

oil. Unscrew the drain plug on the underside of the crankcase

and allow the oil to drain.

Remove the large hexagon-headed plug which is located

just below the left-hand engine casing. Remove the plug,

followed by the spring and gauze element, and then wash all

these components carefully in a suitable solvent. Wipe out any

residual oil from the housing with a clean lint-free rag prior to

reassembly. Refit the drain plug, tightening it to a torque setting

of 2.0 - 3.5 kgf

(14.5 - 25

Ibf

ft), and refill the engine with

the correct quantity and grade of oil.

Six-monthly, or every 3600 miles (6000 km)

Repeat all service operations listed under previous

headings, then carry out the following:

/ Clean the air filter

Pull off the right-hand side panel and remove the two nuts

which secure the air filter cover. Withdraw the cover, checking

that the sealing gasket is in good condition, pull out the

retaining spring and withdraw the element assembly. Peel off

the inner and outer foam sleeves. Wash all components in white

spirit (Stoddard solvent) or in warm water and detergent and

dry them thoroughly. Soak the foam sleeves in the specified oil,

then squeeze them gently (do not wring them out or they will be

damaged) to expel all surplus oil. Refit the sleeves to the

element frame. On reassembly ensure that all components are

correctly fitted so that unfiltered air cannot bypass the element.

2 Check the spark plug

Remove the spark plug cap, unscrew the plug and check its

condition, comparing it with the photographs on page

65. If it is badly worn or fouled it must be renewed. If it is fit for

further service check the gap and reset it if necessary, as

described in Chapter 3.8.

3 Check the valve clearances

It is important that the correct valve clearance is

maintained. A small amount of free play is designed into the

valve train to allow for expansion of the various components. If

the setting deviates greatly from that specified, a marked drop

in performance will be evident. In the case of the clearance

becoming too great, it will be found that valve operation will be

noisy, and performance will drop off as a result of the valves not

opening fully. If on the other hand, the clearance is too small

the valves may not close completely. This will not only cause

loss of compression, but will also cause the valves to burn out

very quickly. In extreme cases, a valve head may strike the

piston crown, causing extensive damage to the engine. The

clearances should be checked and adjusted with a cold engine.

Place the machine on its centre stand and remove the

rocker cover, taking care not to damage the 0 ring. Remove the

gearchange pedal and the left-hand outer cover to expose the

generator rotor.

Remove plug and allow old oil to drain

Remove the spark plug, then slowly rotate the engine anti-

clockwise by way of the generator rotor, watching the inlet

valve. When it has opened and closed again (sunk down and

risen up to its original position), rotate the engine further until

the T mark on the rotor periphery aligns exactly with the raised

index mark which is positioned between

and 1 o'clock (from

the crankshaft) on the generator stator. The engine will then be

in the correct position for checking the valve clearances, namely

at Top Dead Centre (TDC) on the compression stroke; check

that there is free play at both rockers.

Using a 0.08 mm (0.003 in) feeler gauge, check the

clearance between the top of each valve stem and its cor-

responding rocker. The feeler gauge must be a light sliding fit,

with the rocker and valve stem just nipping it. If necessary,

slacken the locknut, and turn the small square-headed adjuster

to obtain the correct setting. Tighten the locknut, holding the

adjuster at the same time to prevent it from moving. Finally,

recheck the setting and then repeat the procedure on the other

rocker.

4 Check the contact breaker points and ignition

timing

Note: since the generator stator plate is located by its

countersunk retaining screws, the ignition timing can only be

altered by opening or closing the contact breaker gap; therefore

both operations are described as one. The full procedure is

given here for ease of reference, but if the points are found to

be in good condition and if the gap has not altered or is within

the tolerance, then the ignition timing will be sufficiently

accurate and there will be no need to carry out the full check.

First remove the gearchange pedal, the left-hand outer cover,

the spark plug and the left-hand side panel.

Strainer is easily removed for cleaning Dismantle the element for cleaning

-j-

mark should align as shown

and lubrication

Honda CG125 (1976-1991) [10/128] Clean the air filter

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