Wetenex TS420 Ignition Coil for TS-410/TS-420 Concrete Cut-Off Saw — Direct-Fit Replacement, Limited-Speed Control

Wetenex TS420 ignition coil is a direct-fit replacement engineered to restore spark performance on TS-410 and TS-420 concrete cut-off saws and replaces part numbers 42384001301 and 42384001307.

If your concrete cut-off saw is misfiring, hard to start, or running inconsistently, the ignition coil is a common source of the problem. This Wetenex coil is manufactured to match OEM electrical specifications and mounting points so it can be installed in place of the factory unit for models TS-410 and TS-420. It includes a limited-speed feature designed to help maintain engine control under varied conditions.

How does this ignition coil improve saw starting and running?

By providing a stable high-voltage pulse to the spark plug, the coil helps ensure consistent ignition timing and more reliable starts. Replacing a worn or damaged coil can eliminate intermittent misfires and reduce rough idling during light-load operation.

• Meets original voltage and resistance specs for TS-410/TS-420 compatibility
• Restores consistent spark delivery for easier cold and warm starts
• Reduces misfires that cause rough throttle response

Will this part fit my saw and which OEM numbers does it replace?

This unit is designed to be compatible with TS-410 and TS-420 concrete cut-off saws and replaces OEM part numbers 4238 400 1307, 42384001307 and 42384001301. Confirm your existing part number or compare mounting and connector locations to ensure a direct fit.

• Replaces 42384001301 and 42384001307 for direct interchangeability
• Compatible with TS-410 and TS-420 models when mounting points match
• Verify part number and plug orientation before installation

What is the limited-speed function and how does it affect operation?

The coil features a built-in limited-speed control that keeps engine RPM within a safer, controllable range during specific conditions. This can help prevent sudden high-RPM surges, offering smoother power delivery and an extra layer of operational safety when cutting under load.

• Limits maximum engine speed to reduce surge risk
• Helps maintain steady throttle response during heavy cuts
• Intended to complement normal operator control, not replace safe use practices

How simple is installation and do I need extra parts?

Installation is straightforward for anyone familiar with small-engine repair: unbolt the old coil, disconnect the spark plug lead and wiring plug, then fit the Wetenex coil in the original position. No additional adapter parts are usually necessary if model compatibility is confirmed.

• Direct-fit design uses the saw’s existing mounting hardware
• Standard plug and spark lead connection—no special tools required beyond basic hand tools
• Consult customer service if your saw has non-standard wiring or altered mounts

Who is this for: The Wetenex TS420 ignition coil is intended for professional contractors, rental-yard technicians, and DIY mechanics who need a reliable replacement part to return TS-410 or TS-420 concrete cut-off saws to dependable operation. It’s suited to users who prioritize OEM-compatible fit and consistent ignition performance, and who will verify part numbers or consult service guides before fitting.