Product Description
Your speedometer doesn't actually measure your speed, it counts pulses from a sensor on your wheel or gearbox and calculates speed based on your stock tire size and gearing. Change any of that, a bigger rear tire, different sprockets, a gearing swap, and the reading goes wrong. The SpeedoHealer sits inline with that sensor signal and lets you apply a precise correction factor, so your speedometer and odometer go back to reading true no matter what you've changed on the drivetrain.
Top Speed De-restrictor: TSD stands for Top Speed De-restrictor. Some bikes and ATVs limit top speed by reading the speed signal and cutting power once you hit a set number, the CBR1000RR and ZX-14 are two well known examples. This version can be configured to either freeze that speed signal at a threshold or slow down how fast it climbs, so the ECU never sees the number that triggers the cut. It's off by default and meant for closed track use only, never the street. It works with any standard SH-V4 harness kit.
Key Features
- Correction steps go down to a thousandth of a percent, and the total range covers anything from a minor tire swap to a completely different final drive ratio.
- On bikes that use the speed signal to cap top speed (some Honda, Kawasaki, Yamaha, and Can-Am models fall into this), fixing the signal also removes that artificial ceiling.
- A small detachable button on the harness lets you pull up your top speed reading whenever you want it.
- Save two separate calibration settings and flip between them with one button press, useful if you swap wheels or gearing between street and track.
- Switch the display between kilometers and miles without touching a wire, right from the unit itself.
- Before you button the bike back up, a built-in test mode lets you confirm the wiring is correct.
- Runs on anywhere from 3 to 19 volts, which matters on certain Yamaha models with a lower charging voltage, and drops into standby automatically to save power.
- A 32-bit processor reads the sensor signal in real time, so there's no lag between the wheel and the display.
- Sealed and weatherproofed, with protection built in against reversed wiring, short circuits, and voltage spikes.
- Size: 50 x 30 x 17mm (1.9 x 1.2 x 0.6 inches)
- Weight: 38g
Complete kit, unit and harness bundled together. Already have the unit? Skip this and grab SpeedoHealer V4-TSD Module Only or SpeedoHealer Harness Kit Only instead.
If you're not sure which part number fits your bike, the fitment search bar above will find it for you. Just enter your Make, Model, and Year.
FAQ
What's included when I buy this?
Both halves: the electronic unit and the bike-specific wiring harness. It's a single order that covers everything needed for installation.
Is the top speed de-restrictor active out of the box?
No, it ships disabled. You have to turn it on yourself, and it's meant for closed track use only, never the street.
Do I need to reprogram it after disconnecting the battery?
No. Your calibration value is stored in flash memory and stays put even if you pull the battery.
Can I buy the module and the harness kit separately?
Yes, they're sold as separate listings. Buy just the module if you already have a harness, or just the harness if you already own a SpeedoHealer module.
Will this fix my speedometer across its whole range, not just at one speed?
In almost every case, yes. Modern speedometers have very little linearity error to begin with, and you can check yours using the SH's built-in test mode.
