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Will the Guardian fit my engine?

Guardian works on any magneto-fired small engine with a kill-to-ground coil: the single-wire kill. Not sure? With the engine idling, touch the coil's kill wire to ground. If the engine dies, Guardian fits.

Engines it fits

  • Predator 212, 224, 301, 420
  • Honda GX and the clones
  • Briggs and other V-twins
  • Karts, minibikes, cycle karts, pit bikes.

V-twins

Yes. Many Briggs V-twins join both coils' kill wires through small diodes in the engine harness. Check those diodes before you install the Guardian.

No battery or charging system needed

Guardian has its own battery and charges off USB-C. It works on engines with no electrical system at all.

Already running a rev-limited coil?

Already running a rev-limited coil? Guardian can only lower the ceiling, never raise it. Your limit is the lower of the two.

Watch: Guardian Installation

Guardian Installation, from the Steamer Power Technical Library.

Updated 2026-10-08