Rolling Wrench
ProBld GY6 Full Auto Tune EFI System
ProBld GY6 Full Auto Tune EFI System
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Tired of constantly chasing carb tune on your GY6? This ProBld full auto-tune EFI system replaces your carb, CDI, and fuel pump with a modern, self-adjusting setup that runs clean in any temp or altitude. Plug it in, wire a few connections, and just ride.
🔍 Does this fit your bike?
- GY6 QMJ157 engines only — 150cc & 171cc supported right now. 180/190/205/232cc tunes are still in development, not ready yet.
- Requires an 11, 12, or 18 pole stator. 8-pole stators will NOT work with this system.
- Compatible with pretty much any wiring harness — Ruckus swap harnesses, Chinese harnesses, etc.
- Running a stock Ruckus ECU or a Rolling Wrench GY6 harness? You'll also need a fuel pump simulator so the ECU doesn't throw errors.
Need a stator upgrade first? 8 → 11-pole kit | Upgrade to 18-pole
⚠️ Before you order
- This replaces your carb, CDI, and ignition coil — the old components aren't reused, so don't set them aside expecting to need them again.
- You need a fuel return line back to the tank. Two ways to do it: our EFI gas cap (recommended, has a built-in return port) or the included drill-in tank nipple — drilling your tank is at your own risk.
- Select the correct stator size in the dropdown below — this determines which EFI magneto we send you.
✓ What's in the box
- Full CNC ProBld EFI intake manifold (anodized gold) with Viton o-ring & hardware
- Installed fuel injector
- Installed throttle body with integrated ECU
- Installed UNI pod air filter
- High-pressure fuel line + low-pressure return fuel line
- EFI wiring harness (3-wire install)
- Return fuel nipple with Viton o-ring (not included if you purchase an EFI gas cap)
- EFI fuel pump (42 psi) + mounting clamp
- EFI magneto — matched to the stator size you select
- Narrowband O2 sensor + weld-in O2 bung for your exhaust
Why EFI instead of a carb? A carb is analog — you physically swap jets and move needles to chase the right air/fuel ratio, and the moment the weather, altitude, or humidity changes, you're back to guessing. This system uses an atmospheric pressure sensor, a throttle position sensor, and a narrowband O2 sensor to constantly adjust fueling in real time, so it self-corrects for cold starts, altitude, and temperature swings without you touching a thing.
Wiring is simple: +12V keyed power, a pickup signal from your stator, and the rest is handled through the included harness.
Running into an issue after install? Check our GY6 EFI troubleshooting guide before reaching out — it covers the most common setup issues.
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Very, very pleased exactly what I was looking for.
Works good just had some clearance issues with the maddog chasis
Love it
I mean i guess i did get everything i asked for although theres no clear specifications on if its a horizontal or vertical mounting for the intake so i have to custom make a new intake forthis kit but thats not too big of a deal