Bikeman Stage 5 Kit – Polaris Pro R 390HP Big Bore Upgrade

Push your Polaris Pro R to its peak with the Bikeman Stage 5 Kit—our most aggressive, dyno-proven performance system delivering up to 390HP. This all-inclusive package is for riders who demand maximum power, torque, and responsiveness.

🔥 Key Features:

• 🧱 2150cc Big Bore Cylinder
  Expands displacement for more power and torque across the full RPM range.
• 🧠 Air Extreme CNC-Ported Head
  Optimized airflow with +4mm exhaust and +1mm intake oversized valves.
• 🎯 .430 Lift Custom Race Cams
  Designed to increase airflow, fuel intake, and overall combustion efficiency.
• ⚙️ Brian Crower 2300cc Stroker Crank
  Boosts torque delivery and enhances low-end grunt.
• 🧼 Stainless Steel Slip-On Exhaust
  Maximizes exhaust flow and delivers an aggressive performance tone.
• ❄️ Cyclone Clutch Cover
  Lowers belt temperatures up to 30°F, increasing belt and clutch life.
• 💪 Stage 2 Clutch Kit with SNYPR Weights & Springs
  Maintains ideal belt tension and performance in all terrains.
• ⚡ Level 8 ECU Flash Tune
  Unlocks peak performance. ECU must be sent in for tuning.

📊 Performance Gains:

• Stock Output: 230–235HP @ 8400 RPM
• Stage 5 Output: 390HP @ 8975 RPM, 225 TQ @ 7050 RPM

With the Bikeman Stage 5 Kit, you get a true torque monster—powerful at takeoff, fierce at top speed, and incredibly responsive throughout.

📦 Included in the Kit:

• Stage 2 Clutch Kit
• Cyclone Clutch Cover
• Stainless Slip-On Exhaust
• ECU Flash (Mail-In Required)
• Custom .430 Lift Cams
• Air Extreme Ported Head
• 2150cc Big Bore Cylinder
• High-Performance Pistons
• Brian Crower 2300cc Stroker Crank

⚠️ Important Notes:

• ECU must be mailed in for Level 8 tune.
• Head exchange or buyout required (not included in listing).
• Matching cam keepers required for valid core return.
• Designed for experienced tuners and riders seeking maximum gains.

🔄 Post-Flash Startup Instructions:

Note: These steps override standard service manual procedures.

1. Rotate engine by hand 10 times clockwise from rear.
2. Verify cam timing.
3. Check oil and coolant levels.
4. Start engine, hold >2000 RPM until reaching 170°F.
5. Gradually drop RPM by 50 every 30s until idle becomes unstable.
6. Hold at unstable RPM until it stabilizes; repeat as needed.
7. Once idle is stable at 1450 RPM, let it run 10–15 minutes.
8. Machine is now ready for riding.
9. May need slight throttle to start due to high-duration cams—this is normal.

🏁 Why Choose the Stage 5 Kit?

• Adds up to 160HP over stock
• Full engine and clutching transformation
• Premium performance with OEM-grade reliability
• Developed and tested by Bikeman Performance – trusted in the UTV racing scene