1 2

Rolling Wrench

GY6 Stage 1 Engine Package - 172cc

GY6 Stage 1 Engine Package - 172cc

$652.00 USD
$652.00 USD
Sale Sold out
Shipping calculated at checkout.
Want to upgrade to stage 2? 👉 Click here!

Feeling like your GY6 just doesn’t have the power it should? 🐌➡️💨 This complete **172cc Stage 1 engine upgrade** gives you stronger acceleration, better uphill pull, and a huge gain in real-world torque — all **without** boring the engine case.

  • 🔥 Max displacement for stock GY6 engine cases
  • 🛠️ Huge durability jump vs. factory parts
  • 🏆 Best power upgrade before going full race builds

The Details ⚙️

The **172cc setup** is the sweet spot for **daily-ride reliability + real power** gains. You’re replacing low-grade OEM components with high-quality Taiwanese parts that can take heat, boost power, and stay reliable for thousands of miles.

Pick your build style:

💪 Full ProBld (Forged Piston) – Performance + Longevity

  • 4032 **forged piston** — stronger, runs cooler
  • Rings **professionally installed & measured**
  • ProBld **big-valve head (28mm / 23mm)** w/ hardware
  • 5-axis CNC **adjustable clocking flange**
  • NGK **spark plug** included
  • ProBld **performance cam** — fast spool + strong pull

Full Rolling Wrench (Cast) — Budget Friendly + Less Work

    • Cast piston
    • Rings
  • pre-measured and installed
  • ProBld big-valve head (28 mm / 23 mm)
  • ProBld camshaft tuned for torque
  • Clocking flange + NGK spark plug included

💵 Full NCY (Cast Piston) – Budget Friendly + Reliable

  • Cast piston — great for everyday use
  • You will gap/install piston rings (DIY step)
  • NCY **big-valve head** — we include the missing hardware
  • 5-axis CNC **clocking flange** included
  • NGK **spark plug** included
  • NCY **smooth torque cam** for daily riding

Quick takeaway: ProBld = Stronger + cooler + less setup work NCY = Affordable + reliable daily upgrade

What's Included 📦

  • 172cc **cylinder + piston** (ProBld or NCY depending on kit selected)
  • **Big valve cylinder head** with hardware
  • **Performance camshaft**
  • **Adjustable clocking flange**
  • **NGK spark plug**
  • All required **gaskets + small parts**

Fitment 🔍

  • QMJ157 GY6 long-case engines only
  • 54mm stud spacing 
  • Honda Ruckus w/ **GY6 swapped** engine
  • Maddog / stretched GY6 builds
  • Some** 150cc buggies/karts (Do your research! There is still a risk our kit will not work so it's up to you as the customer to make sure you are ordering the right part, as there is NO RETURN on performance parts)

Check your engine code before ordering. It’s stamped on the left-side near the center stand pivot.

Important Things to Note 🚨

  • Fits QMJ157 engines only.
  • No engine boring required — installs in stock cases.
  • Buggies/go-karts: spacing varies, confirm first.

If you're unsure — send us a pic of your engine code and setup 👍

View full details