MTD 70 Series Especificaciones descargar pdf (Pagina 59)

IGNITION SYSTEM

8. Set the multimeter to the ohms (Ω) scale.

• If the multimeter shows continuity, replace the

module.

• If the multimeter does not show continuity,

check the wire for a break and check the ground

connection. See Figure 7.9.

The module

The coil in this ignition system is an inductive discharge

magneto, contained in a single module.

• The inductive discharge magneto has a two leg

design.

• The magneto is energized by the passing of a

pair of magnets mounted in the flywheel.

• Ignition timing is set by the location of the fly-

wheel in relation to the crankshaft. Proper timing

is maintained by a steel key.

Normal performance of the coil is to produce at least

10,000 volts at starter-rope pull-through speed.

The presence or absence of strong spark, with the stop

switch known to be good, is generally enough to iden-

tify the ignition coil as good or bad. Resistance read-

ings may help confirm the source of the failure, but are

generally meaningless because they only measure a

small part of the module.

NOTE: Presence of a weak spark maybe the

result of an improper air gap. The air gap space

should be .008”-.016” (.2-.4mm).

Simple spark-testers are readily available and inexpen-

sive. Thexton Part # 404 is available from a variety of

retailers, and similar units are available form other

manufacturers. See Figure 7.10.

NOTE: If the complaint is that the engine quits

running when it gets warm, the ignition module

should be tested with the engine at normal oper

ating temperature.

Figure 7.9

Blue wire

Ground connection

Figure 7.10

Instructions on

back of package

www.mymowerparts.com

For Discount White Outdoor Parts Call 606-678-9623 or 606-561-4983

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