Motors, speed controls and radio gear for HYPER GO RC cars

Brushless or brushed, and why the shelf carries both

A brushless can has no contacts to wear, runs cooler and delivers more power for its size. That is why the fast cars use the B284B 2845 motor with its heatsink and twin fans. A brushed 390 is cheaper, softer in its delivery and completely serviceable with hand tools, which is why the H16DR and H16SC keep one.

The two are not interchangeable. A brushed motor needs a brushed speed control, and the sensor wiring and the mount pattern differ. Buy against your model code.

Reading the 45A speed controls

The E45M, E45P and E45K2 are all 45 amp units with their own heatsinks. They detect whether two or three cells are plugged in and set the low voltage cutoff to match, which is the single most useful safety function on the car: the pack stops the motor rather than the motor flattening the pack.

The RE353 is the brushed equivalent and combines the speed control with a three channel receiver in one case, which saves space in the smaller chassis and halves the number of plugs to check.

Steering, and the part most owners replace second

The 16700 is a three wire digital steering servo, the same unit we fit on the line. Digital means it holds its commanded angle against load rather than drifting under it, and on a 4WD truck landing sideways that difference is measurable.

A servo that buzzes at rest, or that returns to centre slowly, has stripped a gear. It is a ten minute swap and it is worth doing before a weekend rather than during one.

Receivers, binding and the T3D transmitter

Receivers are matched to the radio generation: R30 for the H16BM, H16DR, H14BM and H16PL, R3B for the H14MK and the 14301 cars, R40 for the H12Y crawlers. Fitting the wrong one gives you a car that powers up and ignores you.

Above all of them sits the T3D, a 2.4 GHz three channel transmitter that will bind to any vehicle in the range. It is the part to buy when a handset goes missing or a child stands on one, and it is the reason we do not scrap cars over a broken radio.

Heat is the thing to watch

Electronics fail hot. If the motor can is too hot to hold after a run, the gearing is too tall for the surface, the rotor is dragging, or the fans are clogged. Any of the three is cheaper to fix than to ignore.

Blow the heatsinks out after dusty sessions, keep the fan wires clear of the spur gear, and give the car two minutes between packs in summer.

Support when a part arrives wrong

Electronics are the hardest items to identify from a photograph, so we would rather you asked than guessed. Mail us the model code, the plug count and a clear picture of the label.

We answer from the address in the footer, we keep the correspondence only as long as the question is open, and we do not share it. If a part reached you damaged, say so in the first line and we will deal with that before anything else.

Matching electronics to the chassis

The 2845 brushless can and the 45A speed controls go into the H16BM, the H16PL and the 1/14 scale H14BM. The 390 brushed motor and the RE353 combined speed control and receiver go into the H16DR monster truck and the H16SC. Mixing the two families is the most expensive mistake on this shelf.

The T3D transmitter is the exception: it binds across the whole MJX HYPER GO range. A receiver, though, is version specific, and a car that powers up and ignores the handset usually has the right unit with a lost binding rather than the wrong one.

What the speed control actually does

Three functions, in order of how often they save a vehicle: it meters current to the motor, it reads the battery and sets a low voltage cutoff, and it limits itself when the heatsink gets hot. That last one is why a 45A unit survives a 4WD truck landing badly.

It delivers nothing extra on a worn drivetrain. If the car feels slow and the motor runs hot, look at gear mesh and wheel bearings before you buy a more powerful can.

Getting help with a part number

Electronics are the hardest items to identify from a photograph, so please send the model code, the number of wires on the plug and a clear picture of the label. We answer from the address in the footer and we hold nothing personal beyond the thread.

Owners who have reviewed a part badly on fitment almost always had a neighbouring version. Thirty seconds of checking saves the whole experience.

Reading the whole car, not just the motor

A slow car is rarely a slow motor. Check the pack, then the gear mesh, then the wheel bearings, then the tires. The data you want is temperature: a motor that is merely warm after a run is doing its job, and one that is too hot to hold is being asked to drag something.

The protective sealing on these parts is rated for wet grass and light snow rather than for a hose. Dust is the quieter enemy — it packs into the heatsink fins, the fan stalls, and the speed control starts limiting itself off-road long before it does on tarmac.

How we handle a customer query

Use the filter on this shelf to narrow the list, then write to us with the model code if two cards still look alike. Our first action is always to check which version you have against what is in stock, because the neighbouring part is the one that gets ordered by mistake.

Screws, body clips and the lower arm sets live on other shelves in the same materials we use on the line, so a single order can cover the repair and the service that follows it. Nothing about this has changed yet and we do not intend that it should.