070-0050-00 PTO Clutch for Bad Boy MZ Magnum 48, 54 | Warner 5219-199

Overview

This 070-0050-00 PTO clutch replacement is an aftermarket electric PTO clutch for select Bad Boy MZ Magnum 48-inch and 54-inch zero-turn mowers.

This clutch replaces Bad Boy 070-0050-00 and cross-references original Warner 5219-199 and the Warner replacement 5219-98. Built with a 1-inch crankshaft bore, 6-inch pulley diameter, and counter-clockwise rotation, this clutch is designed to restore reliable mower deck engagement when matched to the correct mower model, original clutch number, connector style, and physical specs.

This listing is available in two configurations that share the same critical 070-0050-00 fitment dimensions and mounting path: the Standard Black Pulley version and the HD Big Bearing Upgrade. The primary difference is clutch construction and wiring configuration.

The Standard Black Pulley version offers flexible wiring adaptability. A flat side-by-side connector plugs directly into the clutch, and it includes an optional wire harness extension for applications requiring a T-plug. The HD Big Bearing Upgrade uses a larger bearing design, a billet-style pulley construction rated at 130 ft-lb of clutch torque, and features a short wire lead terminating in a T-plug only.

Key Features

• Aftermarket electric PTO clutch replacement for listed Bad Boy 070-0050-00 applications
• Available Configurations: Standard Black Pulley or HD Big Bearing Upgrade
• Crankshaft Bore: 1"
• Pulley Diameter: 6"
• Rotation: CCW from pulley side
• Voltage: 12V DC
• Standard Wiring: Flat side-by-side connection at clutch with optional wire harness extension to T-plug
• HD Wiring: Short wire lead with T-plug only
• HD Construction: Upgraded replaceable large-bearing configuration, billet-style pulley, 130 ft-lb torque capacity (Standard is 105 ft-lb)
• Mounting Feature: HD version includes a more easily accessible wrenchable D-spacer for a convenient holding point during final torque
• Integrated electric clutch and brake assembly
• Fully assembled and ready to install

Torque rating note: The 130 ft-lb specification on the HD version is the clutch's rated torque capacity, not the mounting-bolt tightening torque. Always use the correct mounting-bolt torque specification for the mower, engine, bolt, and clutch installation.

Compatible Brands & Models

This PTO clutch fits select Bad Boy MZ Magnum applications using the confirmed 070-0050-00 / Warner 5219-199 clutch path.

Confirmed Bad Boy MZ Magnum Applications

• MZ Magnum 48: 48-inch deck with Kohler KT725 engine
• MZ Magnum 54: 54-inch deck with Kohler KT740 engine
• MZ Magnum 48: 48-inch deck with Kawasaki FR651V engine
• MZ Magnum 54: 54-inch deck with Kawasaki FR651V engine

Fitment note: Bad Boy changed PTO clutch configurations on later MZ and MZ Magnum machines. Later applications may use 070-0055-00 or another clutch. Match the number from the original clutch or verify part number by mower model and serial number in official parts diagram before ordering. Do not order by the MZ Magnum name alone.

Replaces OEM Part Numbers

• Bad Boy: 070-0050-00

Aftermarket Cross-Reference Numbers

• Warner Original: 5219-199
• Warner Replacement: 5219-98, 521998

Common Symptoms of a Failing PTO Clutch

• Blades will not engage when the PTO switch is activated
• PTO clutch clicks but the mower deck does not turn
• Blades engage when cold and stop after the mower heats up
• Intermittent blade engagement under load
• Deck belt slips, squeals, or smokes during engagement
• Burning smell or excessive heat near the PTO clutch
• Grinding, bearing noise, or vibration from the clutch area
• PTO fuse repeatedly blows because of a clutch coil or wiring fault
• Clutch remains mechanically engaged with the PTO switch off

What’s Included

Standard Black Pulley

• 1 complete electric PTO clutch assembly
• 6-inch black pulley
• Encapsulated electromagnetic coil
• Integrated brake assembly
• Flat side-by-side clutch connector
• Optional wire harness extension to T-plug

HD Big Bearing Upgrade

• 1 complete HD electric PTO clutch assembly
• 6-inch billet-style pulley
• Upgraded large-bearing construction
• Encapsulated electromagnetic coil
• Integrated brake assembly
• Short wire lead with T-plug only
• Accessible wrenchable D-spacer configuration

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment guarantee
• 1-year warranty
• Fitment-first product descriptions
• Clear Bad Boy and Warner part-number routing
• Clear product photos showing the actual pulley, wiring, and clutch construction
• Installation and troubleshooting resources before and after purchase
• Helpful support for mower owners and repair shops

Need Help Confirming Fitment?

Email support@ptodirectusa.com with your Bad Boy mower model, serial number, engine model, deck size, or original PTO clutch number.

FAQ

Does this PTO clutch replace Bad Boy 070-0050-00?

Yes, this clutch replaces 070-0050-00 on compatible Bad Boy MZ Magnum applications. Confirm the original clutch number, 1-inch bore, 6-inch pulley, counter-clockwise rotation, and connector style before ordering.

What Warner clutch crosses to Bad Boy 070-0050-00?

The original Warner cross-reference for Bad Boy 070-0050-00 is Warner 5219-199. Warner also lists 5219-98 as the replacement for 5219-199. Both configurations share the same fitment path.

What is the torque rating of this PTO clutch?

The HD Big Bearing clutch is rated at 130 ft-lb of clutch torque capacity, while the Standard version maintains the original 105 ft-lb rating. These figures describe the clutch's holding capacity and should not be confused with the mounting-bolt tightening specification.

Does this clutch fit a Bad Boy MZ Magnum 48 or 54?

Yes, parts information confirms 070-0050-00 on MZ Magnum 48-inch and 54-inch applications using the Kohler KT725, Kohler KT740, and Kawasaki FR651V engines. However, later models may use 070-0055-00. Always match the original clutch number and mower serial information before ordering.

What connector style does this clutch use?

Connector style depends on the selected variant. The Standard Black Pulley version features a flat side-by-side connector at the clutch housing and includes an optional wire harness extension for applications needing a T-plug. The HD Big Bearing Upgrade uses a short wire lead terminating strictly in a T-plug.

What is the difference between the Standard and HD Big Bearing versions?

Both versions share the critical 070-0050-00 fitment dimensions (1-inch bore, 6-inch pulley) and mounting path. The Standard Black Pulley version provides flexible wiring with its optional T-plug extension harness. The HD Big Bearing Upgrade uses larger-bearing clutch construction, a billet-style pulley, a higher 130 ft-lb torque rating, and a dedicated T-plug lead.

Which variant should I choose if my mower uses a T-plug?

Both variants will work for a T-plug setup. The HD Big Bearing Upgrade plugs in directly with its built-in T-plug lead, while the Standard Black Pulley version will utilize the included wire harness extension to adapt its flat connector to your T-plug.

What bore size does Bad Boy 070-0050-00 use?

The confirmed Warner 070-0050-00 replacement path uses a 1-inch crankshaft bore. Confirm your crankshaft size before ordering.

What pulley diameter does 070-0050-00 use?

This clutch uses a 6-inch pulley diameter. Also compare pulley offset and belt alignment to the original clutch.

What rotation does this PTO clutch use?

This clutch uses counter-clockwise rotation when viewed from the pulley side, commonly written as CCW from pulley side.

Getting ready to install your PTO clutch? Review the PTO Clutch Installation Guide for crankshaft preparation, mounting-bolt torque guidance, wiring checks, burnishing, and the final torque check.

Need a different Bad Boy clutch? Browse the Bad Boy PTO clutch collection or shop the full electric PTO clutch catalog.