GY6 Stage 2 Engine Package - 172cc - Carbureted

Here are links to each individual part 👇

• 172cc Cast Piston Cylinder - Rolling Wrench
• 172cc Forged Piston Cylinder – ProBld
• GY6 61mm Performance Big Valve Head
• GY6 Performance Camshaft – ProBld
  
• NCY Performance Cylinder
  
• NCY Performance Cylinder Head
  
• GY6 Camshaft - NCY
  
• Shorty Pro Clocking Flange
• GY6 Scooter Spark Plug (Pre-gapped)
• 8mm Exhaust Studs + Nuts
• GY6 PWK Complete Performance Carburetor - QMJ157
  

Already running our 172cc setup but want more throttle response and usable power? 🔥 Stage 2 unlocks the full potential of your big-bore engine with a properly matched PWK performance carb system — crisp fueling, instant response, and stronger pull everywhere.

• 💨 Faster acceleration & cleaner throttle
• 🧰 All parts matched to work together — no guesswork
• 🛵 Best upgrade after Stage 1 (172cc)

The Details ⚙️

With the 172cc big-bore foundation in place, the engine can flow way more air — but the stock carb becomes a bottleneck. The PWK 28mm carb is tuned specifically for this head and valve design, letting the engine breathe and make the power it was built for.

Performance Carb System Includes:

• 🏁 PWK 28mm carburetor
• 5-Axis CNC intake manifold
• High-temp silicone intake coupler
• 76" throttle cable (pre-installed — no trimming)
• UNI USA pod filter (washable + reusable)
• 20-piece jet kit — tune for altitude/exhaust
• Adjustable carb clocking flange

Choose Your Piston Setup

Full ProBld (Forged) — strong, cool-running, long-life build

• 4032 forged piston
• Rings pre-installed & measured
• ProBld big-valve head (28mm/23mm)
• ProBld performance camshaft

Full Rolling Wrench (Cast) — value-minded daily setup, rings installed:

• 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) — budget-friendly daily build

• Cast piston — reliable commuter setup
• You gap/install rings
• NCY torque-tuned camshaft

What's Included 📦

• PWK 28mm carburetor (finish option selected)
• 5-Axis CNC intake manifold
• High-temp coupler
• 76" throttle cable (pre-installed)
• UNI performance pod filter
• 20-piece jet kit
• Adjustable clocking flange
• 172cc piston/cylinder & big-valve head (ProBld or NCY)
• Performance camshaft
• NGK spark plug

Fitment 🔍

• QMJ157 GY6 engines only (long-case)
• Honda Ruckus GY6 swap builds
• Maddog / stretched GY6 builds
• Most 150–232cc GY6 scooters & buggies

Check your engine code — stamped on the left case by the center-stand pivot.

Important Things to Note 🚨

• MUST be QMJ157 engine — not QMB/QMI
• No engine case boring required
• Buggies may require spacing checks

If you’re unsure — send us a pic of your engine 👌