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CG125 (1976-1991)
Инструкция по эксплуатации Страница: 11

Honda CG125 (1976-1991) [11/128] Check the fuel system

Routine maintenance

Checking the condition of the contact breaker points

The contact breaker assembly can be viewed through one

of the generator rotor slots; turn the rotor until the points open.

Use a small screwdriver to push the moving point open against

its spring. Examine the point contact faces. If they are burnt or

pitted, remove the points for cleaning or renewal, see Chapter

3.4. Light surface deposits can be removed with crocus paper or

a piece of stiff card.

If the contact faces are badly burnt or pitted, or if the

moving contact fibre heel shows signs of wear or damage,

renew the assembly. It is essential that the points are in good

condition if the ignition timing is to be correct; use only genuine

Honda parts when renewing. If the faces are only mildly

marked, clean them using an oilstone or fine emery but be

careful to keep them square. If it is necessary to separate the

moving contact from the fixed one, carefully remove the circlip

fitted to the pivot post and note carefully the arrangement of

washers at both the pivot post and spring blade fixing. On

reassembly, the moving contact must be able to move freely;

apply a smear of grease to the pivot post. Note also that the low

tension lead terminal and the moving contact spring blade must

be connected to each other via the small bolt, but that both

must be completely insulated from the fixed contact. The engine

will not run if a short-circuit occurs at this point.

Refit the points to the stator plate and the rotor to the

crankshaft. Tighten the rotor nut to a torque setting of 4.0 - 5.0

kgf m (29 - 36

Ibf

ft), then apply a few drops of oil to the cam

lubricating wick.

Checking the ignition timing

Disconnect the generator wiring at the connector block

joining it to the main wiring loom and identify the black or

black/white wire leading to the points. The best way of

establishing exactly when the points open is to use either a

multimeter set to its most sensitive resistance scale, or a

battery and bulb test circuit; refer to Chapter 3 for details. The

meter needle will flicker to indicate increased resistance as the

points open, or the bulb (which will be lit when the points are

closed) will glow dimmer; note that a high-wattage bulb must

be used to make this more obvious to the eye.

Turn the rotor anticlockwise until the meter needle deflects

(or the bulb dims); at this point the rotor 'F' mark should align

exactly with the raised index mark on the stator plate.

The setting is adjusted by opening or closing the points gap

to advance or retard respectively the ignition timing. Repeat the

procedure to check that the timing is now correct.

When the timing is correct, measure very carefully the

points gap, to ensure that the dwell angle is correct for the

maximum spark intensity. If the gap is found to be outside the

permitted tolerance the contact breaker points are excessively

worn and must be renewed.

Fit a new set of contact breaker points; note that it is

essential that only genuine Honda points are used. Refit the

rotor and set the points gap to exactly 0.35 mm

(0.014

in), then

repeat the procedure given above. The ignition timing should be

correct.

Note: The above procedure is described in full as it is the

most accurate means of setting the ignition timing. In practice

there is no need to repeat the full procedure at every service

interval. Instead it is sufficient to check that the points gap is

within tolerances.

a strobe timing light is available the

ATU's

performance

can be checked. Connect the light following its manufacturer's

instructions, then start the engine and allow it to idle. At idle

speed the

mark should align with the raised index mark; at

just above idle speed the mark should appear to move as the

advance begins until at 3000

rpm

the two parallel lines of the

full advance mark are aligned with the index mark. If the

movement is stiff and jerky, or if the advance range is restricted,

the rotor must be removed so that the ATU can be dismantled

for cleaning and greasing.

5 General checks and lubrication

At regular intervals the control cables must be thoroughly

lubricated, using light machine oil. This can be done by either

disconnecting the cable upper end and fitting a proprietary

cable oiler to pump oil through, or by removing the cable from

the machine and hanging it up overnight so that oil can drain

through the cable from a small funnel attached to its upper end.

Ensure that the cables are correctly routed and adjusted on

refitting. Grease the speedometer drive cable as described in

Chapter

4.17.

Check all pivots and control levers, cleaning and lubricating

them to prevent wear or corrosion. Where necessary, dismantle

and clean any moving part which may have become stiff in

operation. Similarly clean, check and grease the stand pivots

and ensure that the return spring holds the stand securely.

Check around the machine, looking for. loose nuts, bolts or

screws, retightening them as necessary.

It is advisable to lubricate the handlebar switches and stop

lamp switches with WD40 or a similar water dispersant

lubricant.

6 Check the fuel system

Referring to the relevant Sections of Chapter 2 (or of

Chapter 7 for (T)PFC carburettors) for full details check that the

petrol tank, tap, and feed pipe are in good condition and

securely fastened with no leaks. Check also that the choke

operates correctly. If rough running of the engine has

developed, some adjustment of the carburettor pilot setting and

tickover speed may be required. Do not make these

adjustments unless they are obviously required; there is little to

be gained by unwarranted attention to the carburettor.

Switch on the petrol tap and unscrew the float bowl drain

plug, allowing a small quantity of petrol to flush through. If large

amounts of dirt or water are found in the petrol, the system

components must be drained and cleaned out.

Once the carburettor has been checked and reset if

necessary, the throttle cable free play can be checked. Open

Set clearance so that the feeler gauge

is a sliding fit

"F" mark should align just as points

separate

Contact breaker gap is measured

via aperture

Honda CG125 (1976-1991) [11/128] Check the fuel system

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