Yamaha Raptor 660 Big Bore + Stroker Rebuild Kit – 102mm | +4mm | Titanium Studs

The ultimate all-in-one performance rebuild kit.
This complete engine rebuild kit fits all Yamaha Raptor 660 models and years and features a 102mm big bore cylinder and +4mm stroker crank to unleash next-level torque and horsepower. Designed for serious riders, this kit includes top-tier components like a JE or CP forged piston, Cometic MLS head gasket, titanium stud kit, and a high-flow oil pump to keep everything cool and tight under pressure.

Built for power and reliability — this kit is perfect for aggressive duning, racing, or trail riding and works with your stock carburetor (jetting required).

✅ What’s Included:

• 102mm Big Bore Cylinder

• JE or CP Forged Stroker Piston

• Hi-Temp Piston Rings

• Chrome Wristpin + Circlips

• Hotrods +4mm Stroker Crank with Rod

• Timing Chain

• High-Flow Aftermarket Oil Pump

• Complete Gasket Kit

• Cometic 102mm MLS Big Bore Head Gasket

• Oil Seal Kit

• Valve Stem Seals

• Water Pump Mechanical Seal

• Clutch Kit

• Maxlock TITANIUM Stud Kit (Lifetime Warranty*)

• Crank Bearings (1 installed on crank)

• Crank Balancer Bearings

• Transmission Bearings

• Shift Cam Bearing

• Clutch Arm Needle Bearing(s)

• Water Pump Bearings

• NGK Spark Plug

• K&N Oil Filter

💡 Compatible with pump or race gas. Works with stock carb (re-jetting required).

🔧 Fitment:

Fits all Yamaha Raptor 660 models and years (2001–2005).

🛡️ Warranty Information:

We stand behind all parts 100%.
Key Terms:

• This is not a DIY product – must be installed by a qualified, experienced mechanic.

• Stud Kit Warranty: If a stud fails during use (not installation), we’ll send a complete replacement kit. No labor or refund coverage.

• Warranty Excludes: Failures due to improper installation, tuning, break-in, misuse, or neglect.

• All claims require parts returned for inspection – no exceptions.
  We do not accept claims based on photos, phone calls, online forums, or another mechanic’s opinion alone.

🔁 Return Policy:

• Returns accepted within 30 days

• Must be 100% complete, unused, and in original packaging

• 10% restocking fee applies

• No returns on installed, modified, or handled parts

• Buyer is responsible for ensuring returned items arrive in original condition