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Here a fun little list:

List of Parts Needed to Upgrade a Harley-Davidson 107 to a 131 with Part Numbers

Upgrading a Harley-Davidson 107 engine to a 131 involves replacing several key components. Below is a detailed list of the parts required, their recommended fits, part numbers, estimated costs, and labor involved.

# # # # **Parts Required**

1. **131 Stage IV Kit**
- **Description:** The core of the upgrade, this kit includes pistons, cylinders, cams, and all necessary gaskets and hardware.
- **Recommended Fit:** Screamin' Eagle 131 Stage IV Kit
- **Part Number:** 92500059
- **Estimated Cost:** $3,495.95

2. **High-Performance Camshaft**
- **Description:** Provides the needed lift and duration for increased performance.
- **Recommended Fit:** Screamin' Eagle SE8-517
- **Part Number:** 25400128
- **Estimated Cost:** $349.95

3. **High-Flow Fuel Injectors**
- **Description:** Ensures sufficient fuel delivery to match the increased engine displacement.
- **Recommended Fit:** Screamin' Eagle Pro Racing 5.5 g/sec Fuel Injectors
- **Part Number:** 27797-08
- **Estimated Cost:** $239.95

4. **High-Performance Oil Pump**
- **Description:** Necessary for improved lubrication and cooling.
- **Recommended Fit:** Screamin' Eagle High-Flow Oil Pump
- **Part Number:** 62400209
- **Estimated Cost:** $179.95

5. **High-Flow Air Cleaner**
- **Description:** Ensures optimal airflow to support the increased engine size.
- **Recommended Fit:** Screamin' Eagle Heavy Breather Elite
- **Part Number:** 29400397
- **Estimated Cost:** $399.95

6. **High-Flow Exhaust System**
- **Description:** Reduces backpressure and supports higher performance.
- **Recommended Fit:** Screamin' Eagle Street Cannon Performance Slip-On Mufflers
- **Part Number:** 64900552
- **Estimated Cost:** $849.95

7. **High-Performance Throttle Body**
- **Description:** Increases air intake capacity.
- **Recommended Fit:** Screamin' Eagle 64mm Throttle Body
- **Part Number:** 27300180
- **Estimated Cost:** $499.95

8. **High-Compression Pistons**
- **Description:** Provides the necessary compression ratio for the upgrade.
- **Part Number:** Included in 131 Stage IV Kit

9. **High-Performance Cylinder Heads**
- **Description:** Improves airflow and combustion efficiency.
- **Recommended Fit:** Screamin' Eagle CNC Ported Cylinder Heads
- **Part Number:** 92500044
- **Estimated Cost:** $1,199.95

10. **Cam Bearings and Installation Kit**
- **Description:** Ensures smooth camshaft operation.
- **Part Number:** 24000030
- **Estimated Cost:** $99.95

11. **Engine Tuner**
- **Description:** Required for recalibrating the engine management system.
- **Recommended Fit:** Screamin' Eagle Pro Street Tuner
- **Part Number:** 41000008C
- **Estimated Cost:** $299.95

12. **Gasket Kit**
- **Description:** Comprehensive kit to replace all necessary gaskets during the upgrade.
- **Part Number:** 17048-99D
- **Estimated Cost:** $69.95

# # # # **Labor Costs**

1. **Engine Disassembly and Assembly**
- **Estimated Labor Time:** 10-15 hours
- **Estimated Labor Cost:** $1,000 - $1,500

2. **Camshaft Installation**
- **Estimated Labor Time:** 2-3 hours
- **Estimated Labor Cost:** $200 - $300

3. **Throttle Body Installation**
- **Estimated Labor Time:** 1-2 hours
- **Estimated Labor Cost:** $100 - $200

4. **Fuel Injector Installation**
- **Estimated Labor Time:** 1-2 hours
- **Estimated Labor Cost:** $100 - $200

5. **Oil Pump Installation**
- **Estimated Labor Time:** 1-2 hours
- **Estimated Labor Cost:** $100 - $200

6. **Air Cleaner Installation**
- **Estimated Labor Time:** 1 hour
- **Estimated Labor Cost:** $100

7. **Exhaust System Installation**
- **Estimated Labor Time:** 2-3 hours
- **Estimated Labor Cost:** $200 - $300

8. **Cylinder Heads Installation**
- **Estimated Labor Time:** 3-4 hours
- **Estimated Labor Cost:** $300 - $400

9. **Engine Tuning**
- **Estimated Labor Time:** 2-3 hours
- **Estimated Labor Cost:** $200 - $300

# # # **Total Estimated Costs**

- **Parts Cost:** $7,684.40
- **Labor Cost:** $2,200 - $3,500
- **Total Estimated Cost:** $9,884.40 - $11,184.40

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# # # Notes

- **Prices are estimates:** Actual prices may vary based on suppliers, location, and specific requirements.
- **Labor costs:** Can vary significantly depending on the shop's hourly rate and the complexity of the installation.
- **Warranty and Quality:** It is recommended to use genuine Harley-Davidson parts or those approved by Harley-Davidson for compatibility and warranty purposes.
- **Professional Installation:** For such an extensive upgrade, professional installation is highly recommended to ensure the reliability and performance of the engine.

This detailed list should help you in planning the upgrade of your Harley-Davidson 107 engine to a 131, ensuring you have all necessary parts and a clear understanding of the associated costs.

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