Fairly difficult,

suitable for competent ^ DIY mechanic

Difficult, suitable for ^, experienced DIY *"

mechanic

Very difficult, ^

sjitable for expert DIY ^

or professional

Specifications

Note: Models are identified by their production code letter - refer to 'Identification numbers' at the front of this manual 'or details.

General information

Cylinder numbering (from left-hand to right-hand side of the bike) 1-2-3-4

Firing order.......................................................................................... 1-2-4-3

Spark plugs................................................................................................ see Chapter 1

Ignition timing

At idle...................................................................................................... 18° BTDC

Full advance

J and К models....................................................................................... 20" BTDC

L, N and H models............................................................................... 32^s BTDC

Pulse generator coils

Resistance...................

340 to 420 ohms @ 20°C

Ignition HT coils

Primary winding resistance

J and К models................

L, N and R models........

Secondary winding resistance with plug caps and leads

J and К models..................

l_ N and R models.......

without plug caps and leads

..................

................ •

2.6to3.2ohms@20°C 2.0 to 4.0 ohms @ 20°C

21.0 to 29.0 K-ohms @ 20°C 23.0 to 27.0 K-ohms @ 20°C 13.0 to 17.0 K-ohms @ 20°C

Torque settings

Note: Where a specified setting is not given for a particular bolt, the general settings listed at the beginning apply. The dimension given applies to the diameter of the thread, not the head.

5 mm bolt/nut....................................................................................................	5Nm
6 mm bolt/nut..........................................................................................	10 Nm
8 mm bolt/nut....................................................................................................	22 Nm
10 mm bolt/nut....................................................................................................	35 Nm
12 mm bolt/nut....................................................................................................	55 Nm
6 mm flange bolt with 8 mm head.................................................................................................................	9Nm
6 mm flange bolt/nut with 10 mm head.................................................................................................................	12 Nm
	27 Nm

5»2 Ignition system

1 General information

All models are fitted with a fully transistorised electronic ignition system, which due to its lack of mechanical parts is totally maintenance free. The system comprises a rotor, pulse generator coil(s), ignition control unit and ignition HT coils (refer to the wiring diagrams at the end of Chapter 9 for details). J and К models are fitted with two pulse generator coils, while L, N and R models have one.

The ignition triggers, which are on the rotor mounted on the left-hand end of the crankshaft, magnetically operate the pulse generator coil(s) as the crankshaft rotates. The pulse generator coil(s) sends a signal to the ignition control unit which then supplies the ignition HT coils with the power necessary to produce a spark at the plugs.

The system uses two colls, the left-hand one supplying nos. 1 and 4 cyl nder spark plugs and the right-hand coil supplying nos. 2 and 3 cylinder plugs. On J and К models, the coils are mounted under the frame cross-member behind the air filter housing, while on L, N and R models they are mounted on the frame under the front of the air filter housing.

The ignition control unit incorporates an electronic advance system controlled by signals generated by the ignition triggers and the pulse generator coil.

2.2 Earth the spark plug and operate the starter - bright blue sparks should be visible

On I, N and R models the system incorporates a safety interlock crcuit which will cut the ignition if the sidestand is put down whilst the engine is running and in gear, or if a gear is selected whilst the engine is running and the sidestand is down. It also prevents the engine from being started if the sidestand is down and the engine is in gear unless the clutch lever is pulled in. J and К models have a simpler system, which does not include a sidestand switch, but prevents the engine from being started If it Is in gear unless the clutch lever is pulled in. and it cuts the starter circuit rather than the ignition circuit.

Because of their nature, the Individual Ignition system components can be checked but not repaired. If Ignition system troubles occur, and the faulty component can be isolated, the only cure for the problem is to renew the part. Keep in mind that most electrical parts, once purchased, cannot be returned. To avoid unnecessary expense. make very sure the faulty component has been positively identified before buying a new part.

Note that there is no provision for adjusting the ignition timing on these models.

Models are identified by their production code letter - refer to 'Identification numbers' at the front of this manual for details.

2 Ignition system - check

A

Warning: The energy levels in electronic systems can be very high. On no account should the ignition be switched on whilst the plugs or plug caps are being held. Shocks from the HT circuit can be most unpleasant. Secondly, it is vital that the engine is not turned over or run with any of the plug caps removed, and that the plugs are soundly earthed (grounded) when the system is checked for sparking. The ignition system components can be seriously damaged if the HT circuit becomes isolated.

1 As no means of adjustment Is available, any failure nf the system can he traced tn failure of a system component or a simple wiring fault. Of the two possibilities, the latter is by far the

most likely. In the event of failure, check the system in a logical fashion, as described below.

2 Disconnect the HT leads from the spark
plugs. Connect each lead to a spare spark
plug and lay each plug on the engine with the
threads contacting the engine (see
illustration). If necessary, hold each spark
plug with an insulated tool.

Warning: Do not remove any of y\ the spark plugs from the engine / J \ to perform this check -*"™"^* atomised fuel being pumped out of the open spark plug hole could ignite, causing severe injury!

2.5 Connect the tester as shown - when the engine is cranked sparks should jump the gap between the nails

3 Having observed the above precautions, check that the kill switch is in the RUN position and the transmission is in neutral, then turn the ignition switch ON and turn the engine over on the starter motor. If the system is in good condition a regular, fat blue spark should be evident at each plug electrode. If the spark appears thin or yellowish, or is non­existent, further investigation will be necessary. Before proceeding further, turn the ignition OFF and remove the key as a safety measure.

4 The ignition system must be able to produce a spark which is capable of jumping a particular size gap. Honda do not provide a specification, but a healthy system should produce a spark capable of jumping at least 6 mm. A simple testing tool can be made to test the minimum gap across which the spark will jump (see Tool Tip) or alternatively it is possible to buy an ignition spark gap tester tool and some of these tools are adjustable to alter the spark gap.

5 Connect one of the spark plug HT leads from one coil to the protruding electrode on the test tool, and clip the tool to a good earth (ground) on the engine or frame (see illustration). Check that the kill switch is in the RUN position, turn the ignition switch ON and turn the engine over on the starter motor. If the system Is In good condition a regular, fat blue spark should be seen to jump the gap between the nail ends. Repeat the test for the other coil. If the test results are good the entire ignition system can be considered

Ignition system 5*3

3.5a On J and К models, disconnect the

Дата добавления: 2015-10-29