Steamer PowerGuardian™
You pulled the governor for more speed. Now that engine can spin itself to death. Guardian sets the ceiling.
- Pre-order to Nov 30
- $149.99
- Regular
- $175
- Ships by
- December 14, 2026
Free US shipping· 30-day returns· 1-year warranty
Designed and assembled in Fulton, Illinois.
- Three wires
- Its own battery
- Set from your phone
- Two-step launch
- Fails safe
Three wires. Your number.
Three wires
Kill, ground, two-step. Its own battery. Charges off USB-C.
Set your limit from your phone
The STOKER app shows live RPM and sets the limit. Change it in the pits in seconds.
Soft, medium, or hard
Pick how the cut feels. Hard pops and crackles.
Two-step launch control
Close the switch and Guardian holds a second, lower limit. Hold it on the line, then launch.
Young rider? Set a lower number
A lower limit is a lower top speed. Set it for the rider on the seat.
Chart Room
STOKER's Chart Room turns Guardian's RPM and your phone's GPS into lap times, a track map, and a dyno estimate.
Fails safe
If Guardian ever stops working, your engine keeps running.
Guardian or a rev-limited coil?
| Feature | Guardian | Rev-limited coil |
|---|---|---|
| Your rev limit | Any number you set | One fixed number per part |
| Change the limit | From your phone, in seconds | Buy and fit another coil |
| Install | Three wires | Pull the flywheel |
| Two-step launch | Yes | No |
| Pick how it hits | Soft, medium, or hard | No |
| Live RPM on your phone | Yes | No |
Soft. Medium. Hard.
Pick how the cut feels. Hard pops and crackles.
FeelMedium
Ships by December 14, 2026
Free US shipping· 30-day returns· 1-year warranty
The real thing.
Designed and assembled in Fulton, Illinois.
Built by a chief engineer.
Tom Urbik has sailed as a marine engineer for twenty years, and has been a chief engineer since 2015. In 2009 he was third engineer on the Liberty Sun when Somali pirates attacked it with rockets. The crew barricaded the engine room, and nobody was hurt.
More about TomOne wire decides.
Guardian works on any magneto-fired small engine with a kill-to-ground coil: the single-wire kill.
- Predator 212, 224, 301, 420
- Honda GX and the clones
- Briggs and other V-twins
Karts, minibikes, cycle karts, pit bikes.
Not sure? With the engine idling, touch the coil's kill wire to ground. If the engine dies, Guardian fits.
Already running a rev-limited coil? Guardian can only lower the ceiling, never raise it. Your limit is the lower of the two.
Three wires, one plug.
Step 1: Mount it with screws through both ears into the frame (screws not included). Never zip ties.
Step 2: Splice the red wire into the coil's factory kill wire.
Step 3: Run the black wire to the engine block.
Step 4: Run the blue wire through your two-step switch to block ground.
Step 5: Plug it in.
Step 6: Press the button once to wake it, then pair it in the STOKER app.
Ships by December 14, 2026
Free US shipping· 30-day returns· 1-year warranty
Straight answers.
Something else? Write to us.
When does it ship?
The first batch ships by December 14, 2026. If we miss that date, you can cancel for a full refund.
How long is the pre-order price?
The $149.99 pre-order price runs through November 30, 2026. After that, Guardian is $175.
How much is shipping?
Shipping in the US is free, by USPS. We do not offer express shipping.
Why does it cost more than a rev-limited coil?
A rev-limited coil is one fixed number, and you pull the flywheel to fit it. Guardian is three wires, any number you want, set from your phone, with a two-step and a choice of how it hits.
Will it 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.
Does it need my engine's battery or charging system?
No. Guardian has its own battery and charges off USB-C. It works on engines with no electrical system at all.
What if it fails?
It fails safe. If Guardian ever stops working, your engine keeps running.
I already have 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.
Can I return it?
Yes. You have 30 days after delivery to return your Guardian for a refund. You pay the return shipping. Email thomas@steamerpower.com to start a return.
Is there a warranty?
One-year warranty. If your Guardian fails from a defect in parts or workmanship within one year of delivery, we repair or replace it. You pay the shipping to send it back. Email thomas@steamerpower.com to start a claim.
Guard your engine.
- Pre-order price
- $149.99
- Pre-order price ends
- November 30, 2026
- Regular price
- $175
- Ships by
- December 14, 2026
The first batch ships by December 14, 2026. If we miss that date, you can cancel for a full refund. Designed and assembled in Fulton, Illinois.
Free US shipping. 30-day returns. One-year warranty. If your Guardian fails from a defect in parts or workmanship within one year of delivery, we repair or replace it. You pay the shipping to send it back. Email thomas@steamerpower.com to start a claim.
Not ready to pay now? Reserve one and pay when it ships.