ProBld Buggy 172cc Competition Drop In Crate Engine

The Details ⚙️

Need a serious drop-in power upgrade for your buggy? This 171cc crate engine delivers nearly double the horsepower of a stock setup.

A factory QMJ157 150cc produces around 7.5 HP — this upgraded engine pushes close to 13 HP, giving you stronger acceleration, better torque, and a much more responsive ride.

Built with a Taiwan-made 172cc top end, this setup features a larger valve, ported head, and upgraded internals designed for real performance gains — not just a basic rebuild.

Choose your fuel system:

• 🔥 28mm PWK Carburetor — simple, proven, and easy to maintain
• ⚡ Auto-Tune EFI System — smoother operation, instant starts, and no rejetting

Drop-in power, built right, and ready to transform your buggy 🔧🔥

Carb vs EFI — Which Should You Choose? 🤔

• 🔥 Carb: Lower cost, simple, and easy to work on — but requires tuning
• ⚡ EFI: Self-adjusting fueling, smoother running, and no carb tuning required

EFI setups also include a charging system upgrade to support the system properly.

Carb = simple. EFI = convenience + consistency 💨

What's Included 📦

Core engine components:

• 🧠 Complete GY6 QMJ157 bottom end engine
• 🔥 171cc / 172cc big bore top end (Taiwan)
• 🫁 Big valve ported cylinder head
• ⚙️ Performance camshaft
• 🛢️ High volume oil pump
• ⚡ High torque starter + starter clutch
• ⚙️ Zen CVT transmission kit
• 🌀 ProBld variator kit
• 🧵 Kevlar drive belt
• 🧲 Billet + titanium drain plugs
• 🔧 Tools + supporting hardware

Fuel system differences:

• 🔥 Carb version: 28mm PWK carb kit (intake, cable, jets, filter)
• ⚡ EFI version: full auto-tune EFI kit + stator upgrade

Everything needed for a high-performance buggy engine in one package.

Important Things to Note 🚨

• ONLY fits QMJ157 buggy engines with gears (neutral, reverse, drive).
• Will NOT fit non-geared or standard scooter engines.
• Compatibility must be verified before ordering.
• EFI setups may require a clocking flange depending on your model.
• We strongly recommend adding an oil cooler for high-performance builds.

Not sure if this fits your buggy? Message us — we’ll help you confirm 👍