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 👍
