Exmark 137-4100 Ignition Switch | Lazer Z Radius Quest Navigator

Exmark 137-4100 Ignition Switch

The Exmark 137-4100 Ignition Switch is an OEM replacement switch listed as SWITCH-IGNITION. This ignition switch is used on select Exmark Lazer Z, Radius, Quest, Navigator, and aerator model applications.

This part is commonly searched as Exmark 137-4100, Exmark 1374100, Exmark ignition switch, Exmark key switch, Lazer Z ignition switch, Radius ignition switch, Quest ignition switch, and Navigator ignition switch.

Always verify your exact Exmark model number, serial number, wiring connector, terminal layout, switch style, key style, mounting location, and parts diagram before ordering. Do not order by mower family or appearance alone because ignition switch fitment can vary by model, serial range, and wiring harness.

Product Details

Key Features

• OEM Exmark ignition switch
• Part number 137-4100
• Listed as SWITCH-IGNITION
• Used on select Exmark commercial and residential mower applications
• Fits listed Lazer Z, Radius, Quest, Navigator, and aerator model references
• Factory-style replacement when listed in your Exmark parts diagram
• Important to verify wiring connector, terminal layout, and switch style before ordering

Fits Select Exmark Aerator Models

Fits Select Exmark Lazer Z Models

The supplied fitment list includes many Exmark Lazer Z model references. Always confirm your full model number, serial number, and parts manual before ordering.

Fits Select Exmark Navigator Models

Fits Select Exmark Quest Models

Fits Select Exmark Radius Models

Important Serial Number Notes

The supplied fitment data includes many model-specific serial ranges, including ranges such as 402082300 - 404314158, 404314159 - 406294344, 406294345 - 408644345, 408644346 - 411294211, 411294212 - 413950473, 413950474 - 416150474, 416150475 - 417930745, 417930746 - 420130746, and model-specific single serial breaks such as 420130747. Always match your exact model and serial number to the correct Exmark parts diagram.

Important Fitment Notes

• This listing is for Exmark OEM part number 137-4100
• Product description: SWITCH-IGNITION
• Verify your exact model number and serial number before ordering
• Confirm your Exmark parts diagram lists 137-4100 for the ignition switch location
• Check connector style, terminal count, terminal layout, key style, mounting hole, switch bezel, wiring harness, and dash panel location
• Do not order by mower family, engine brand, deck size, or appearance alone
• Keys, wiring harness, switch nut, bezel, mounting hardware, relays, fuses, and related electrical parts are not included unless shown or stated

When to Replace an Ignition Switch

• Key switch is loose, damaged, corroded, or worn
• Machine will not crank or shuts off intermittently due to switch failure
• Key turns but does not consistently activate the start/run positions
• Switch terminals or connector area are damaged
• Your Exmark parts diagram lists part number 137-4100 for the repair

Installation and Electrical Service Notes

Before servicing electrical components, park the machine on a flat surface, disengage the blades or attachment system, set the parking brake, shut the engine off, remove the key, and disconnect the battery.

• Take a photo of the original wiring connector and switch position before removal
• Inspect the wiring harness, connector, terminals, fuses, relays, battery cables, and grounds during service
• Compare the replacement ignition switch to the original before installation
• Do not force mismatched connectors or terminals
• Reconnect the battery and test all switch positions before returning the unit to service
• Follow the Exmark service manual for your exact model and serial number

Part Number / Search Terms

• Exmark 137-4100
• Exmark 1374100
• 137-4100 ignition switch
• Exmark SWITCH-IGNITION
• Exmark ignition switch
• Exmark key switch
• Lazer Z ignition switch
• Radius ignition switch
• Quest ignition switch
• Navigator ignition switch
• Exmark aerator ignition switch
• OEM Exmark electrical parts
• OEM Exmark mower parts

Frequently Asked Questions

P&P Small Engines stocks Exmark ignition switches, electrical parts, Lazer Z parts, Radius parts, Quest parts, Navigator parts, belts, blades, filters, pulleys, spindles, and commercial mower replacement parts.