MTD 70 Series Specifications download pdf (Page 57)

IGNITION SYSTEM

Stop switch

All MTD horizontal engines that are in use in North

America have a stop switch built into the throttle lever

assembly. MTD engines used on snow blowers have

an additional stop (ignition) switch in the engine

shroud.

Test the stop switch (throttle) by:

NOTE: On snow engines, test the remote (igni-

tion) stop switch first.

1. Remove the fuel tank by following the steps

described in Chapter 4: The Fuel System And

Governor.

2. Remove the engine shroud (snow engines) by

following the steps described in Chapter 3: Air

Intake Systems.

3. Remove the blower housing.

4. Disconnect the lead that runs from the module to

the stop switch.

See Figure 7.2.

5. Connect one lead of a digital multimeter to the

lead going to the stop switch. Connect the other

lead of the digital multimeter to a good ground.

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

7. Operate the throttle lever while watching the

multimeter.

• When the throttle is all the way to the right

(stop), the multimeter should read at or near

0.0Ω, indicating continuity. See Figure 7.3.

• When the throttle is all the way to the left (full

throttle), the multimeter should not show conti-

nuity. See Figure 7.4.

Figure 7.2

Disconnect switch

Figure 7.3

Switch lead

Ground

Throttle lever

continuity

Figure 7.4

no continuity

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MTD 70 Series Specifications Page 57

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