Power Wheels Motor Upgrade: More Speed Without Stripping Gears
The cheapest real Power Wheels upgrade isn't a new motor — it's more voltage. Push 18V or 24V through the stock 12V motors and it speeds up the same day, but anything past 18V means you also upgrade the nylon gears and thin factory wiring, or you'll strip a gearbox and melt connectors inside a season.
By the MyTinyRider Editorial Team
Start with volts, not a new motor
More voltage is the cheapest way to wake a Power Wheels up, and it's the first thing I reach for. Feed a 12V car 18V and it picks up about half again its speed; feed it 24V and it's close to double — same motors, same gearbox, just more push through them.
The catch is what those stock parts were built for. The motors and the nylon gears they drive are spec'd for 12V. Run them at 24V and they'll happily spin faster — right up until the gears strip, the motor cooks, or the pedal switch welds shut. So the upgrade is never just a bigger battery. Past 18V it's battery, gears, and wiring, and you do them together or not at all.
The four upgrades that actually do something
Every hopped-up Power Wheels is some combination of these four. Work through them in order — each one buys headroom for the next.
- More voltage. Swap the 12V battery for an 18V cordless-tool pack (Ryobi One+, DeWalt 20V Max, Milwaukee M18 — all around 18V nominal), or wire two 12V batteries in series for 24V. This is where the speed comes from.
- Aftermarket motors. Higher-wound brushed motors from a specialist like MLToys drop into the stock gearbox and take 18–24V better than the factory cans, with more low-end torque for hills and heavier kids.
- Steel gears. The weak link at higher voltage is the nylon gear inside the gearbox. Steel replacement gears (again, MLToys has sold these to the hobby for years) stop the strip-out.
- Hardened wiring and a fuse. Upsize the thin factory wire, add an inline 30–40A fuse, and put a relay behind the on/off pedal switch so the extra current isn't arcing across a plastic microswitch.
Stock vs upgraded: the tradeoff table
Speeds below are ballparks — real numbers swing with kid weight, tire type, and how worn the gearbox already is. Treat them as relative, not a spec sheet.
Setup Typical top speed Torque / hills Risk to gears Risk to motor & wiring Stock 12V ~4–5 mph Baseline Low Low 12V → 18V (single tool battery) ~6–7 mph Noticeably better Low–moderate Low–moderate; motor runs warmer 12V → 24V on stock parts ~8–10 mph Strong High — nylon gears strip High — motor overheats, connectors melt, fuse trips 24V + steel gears + heavy wiring ~8–10 mph Strong Low Moderate — motor is now the limiter Aftermarket motor + steel gears + 24V ~10–12+ mph Strongest Low Moderate; motor built for the voltage Power Wheels speed vs strain by upgrade path What breaks first, and the fix
Higher voltage spins the motor faster — a brushed DC motor's no-load speed climbs about in step with volts. Under load it also draws more current, and current is heat. Heat is what kills these builds. Here's what fails, roughly in order:
Part What goes wrong Fix Nylon gears Teeth soften and shear — the classic 24V-on-stock-parts death Steel replacement gears Brushed motor Overheats; enough heat can weaken the magnets and it never makes full torque again Motor rated for 18–24V; ease off on long hills Wiring & connectors Thin factory wire and the battery plug run hot and can melt 14–12 AWG on the motor runs, a better connector Pedal switch The on/off contact arcs and pits under the higher current A relay so the switch isn't carrying motor current Thermal fuse The battery's built-in fuse trips to protect itself and the car cuts out Inline 30–40A fuse you can actually reach and replace Failure points when you overvolt a Power Wheels 18V or 24V? Pick by who's driving
Want the easy win? Go 18V off a single cordless-tool battery. One pack, one adapter, no series wiring, and the stock gears usually shrug it off. You get a real bump and the toy stays dependable — which is why it's what I'd point most families to.
Step up to 24V when the kid's bigger, the yard has hills, or you're chasing top end. Just treat it as a package: steel gears and heavier wiring go in with the batteries, not after the first gearbox lets go. Twenty-four volts on untouched stock parts is the number-one way these builds die young.
Before you wire anything in
- Match polarity and the connector. A reversed battery runs the car backward and can pop the electronics.
- Keep a fuse in the circuit. The factory battery has a thermal fuse built in; if you move to loose batteries, add your own inline 30–40A ATO fuse.
- Check the gearbox first. Pop a wheel and look at the gears — if they're glazed or chipped already, upgrade them before you add voltage, not after.
- Don't push past 24V on a Power Wheels drivetrain. Beyond that you're into custom motors, controllers, and brakes, and the plastic chassis and steering weren't built for the speed.
- Add a real master on/off switch you can reach in a hurry.
This is an adult project. Faster speeds mean a helmet, close supervision, and a look at whether the brakes and steering still hold up — the chassis was engineered around the stock speed, not your new one.
When a new motor earns its money
A new motor isn't where you start — voltage and gears come first. It pays off when you need torque the stock cans just can't make: a heavier kid, a steep or grassy yard, a two-seater with a sibling aboard. Aftermarket brushed motors wound for 18–24V take the current and pull harder off the line, which is exactly where a kid feels the difference. Run them with steel gears, always — a stronger motor feeding nylon gears just chews them up quicker.
Bottom line
Cheapest upgrade that actually matters: one 18V tool battery. Biggest jump you can trust: 24V with steel gears and fatter wiring, all in at once. A new motor: only when you're chasing torque, and never without metal gears behind it. Get the order right and you'll end up with a faster ride-on that lasts more than one summer.