171cc GY6 Drop In Crate Engine

The Details ⚙️

If you're looking for serious drop-in power, this 171cc GY6 crate engine is one of the most proven setups you can run on a Ruckus or GY6 platform.

Each engine is built by in house and configured by us, ready-to-run.

Now available with two fuel system options:

• 🔥 28mm PWK Carburetor — Simple, proven, and easy to tune (user will need to jet)
• ⚡ ProBld EFI System — Plug-and-play fuel injection with instant starts, smoother running, and zero tuning

🚀 Learn more about EFI:

👉 ProBld Plug & Play EFI System

Carb vs EFI — Which Should You Choose? 🤔

Both options make great power — the right choice comes down to how you want the bike to behave and how much tuning you want to deal with.

• 🔥 PWK Carburetor: Best for simplicity and lower cost. Easy to work on, widely understood, but requires manual tuning (especially with elevation or weather changes).
• ⚡ EFI System: Best for convenience and consistency. Starts instantly, automatically adjusts fueling, runs smoother, and eliminates carb tuning completely.

At higher elevations (like Colorado): EFI has a major advantage — it automatically compensates for thinner air, while carb setups will require frequent tuning.

Simple rule: Carb = hands-on tuning. EFI = set it and forget it 💨

What's Included

• Fully built 171cc GY6 Forged or cast piston stage 1 package: CLICK HERE TO LEARN MORE
• ProBld Intake spacer
•  Ultimate Reveno CVT transmission kit with forged pulley: CLICK HERE TO LEARN MORE
• Titanium clutch and variator nuts
•  Short wheel axle kit
• 171cc gear up kit
•  Black case brace
•  Black CVT ankle biter 
•  Rear disc brake kit (comes all black, with options of silver, gold or red
•  High torque starter
• ProBld CNC / Titanium magnetic drain plugs 
• ProBld CNC dipstick with breather

Depending on configuration:

• 28mm raw PWK carburetor setup or
• ProBld EFI system with 18-pole stator

Important Things to Note 🚨

• Built to order — expect ~2–3 week lead time.
• No warranty on performance engines.
• Proper break-in is critical:
  • Vary RPMs during initial riding
  • Avoid sustained high load early on
  • Change oil at ~100 miles
• Tuning is required on a carburetor engine build.
  

Not sure which setup is right for you? Message us — we’ll help you spec it out 

👉 Request a custom build here