KAWASAKI 13031-0074 Crankshaft Piston Connecting Rod

( Manufacturer Part Number: 13031-0074 ), ( Part Type: Crankshaft Piston Rod ), ( Oe/oem Part Number: 13031-0074 13001-0088 ), ( Compatible Year: 2006, 2007, 2008 ), ( Country Of Origin: Japan )

Review KAWASAKI Crankshaft And Piston Connecting Rod fits KX250F 2006–2008

The **Kawasaki 13031-0074 OEM Crankshaft, Piston, and Connecting Rod Assembly** for the **2006 2008 Kawasaki KX250F** represents a high-performance, precision-engineered set designed to restore or enhance the reliability and power output of this iconic off-road dirt bike. This **direct-fit, factory-specified component group** consists of a **forged aluminum crankshaft**, a **high-strength piston**, and a **heat-treated connecting rod**, all meticulously machined to Kawasaki s exacting tolerances to ensure seamless integration with the stock engine block. The **crankshaft** features a **four-bolt main bearing cap design**, providing superior strength and durability under the demanding stresses of high-revving, high-torque off-road riding, while its **counterweighted configuration** helps minimize vibration for smoother operation. The **piston**, crafted from **aluminum alloy**, is precision-balanced and features a **dished profile** optimized for efficient combustion and power delivery, reducing internal friction and heat buildup for prolonged engine life. Complementing these components is the **connecting rod**, forged from **chromoly steel** for exceptional strength and rigidity, ensuring it can withstand the extreme forces generated during aggressive riding, whether on the track or in rough terrain. This assembly is **fully compatible** with the KX250F s **249cc single-cylinder engine**, offering an ideal upgrade for riders seeking to restore stock performance, improve reliability, or prepare the bike for high-performance modifications. Whether replacing worn components or upgrading for enhanced durability, this **OEM-quality set** delivers the confidence of factory precision, ensuring optimal power transfer and longevity for the demanding demands of motocross and trail riding.

### **Pros and Cons of Buying a Kawasaki KX250F Crankshaft, Piston, and Connecting Rod (Part Numbers: 13031-0074 for 2006-2008 Models)**

1. **OEM Quality** Kawasaki is a reputable manufacturer, and these components are designed to meet the exact specifications of the 2006-2008 KX250F, ensuring proper fit and performance.

2. **Durability** The crankshaft, piston, and connecting rod are built to withstand high stress, making them suitable for both stock and modified engines.

3. **Compatibility** These parts are direct replacements for the original components, reducing the risk of compatibility issues with other brands.

4. **Performance Potential** If the engine is running poorly due to wear, upgrading to new OEM parts can restore power, reliability, and longevity.

5. **Warranty Coverage** Kawasaki parts often come with manufacturer warranties, providing some assurance against defects.

6. **Easier Maintenance** Since these are genuine parts, they integrate seamlessly with the engine, simplifying installation and reducing the need for additional modifications.

7. **Resale Value** If the bike is being restored or resold, having OEM components can improve its perceived value.

1. **Cost** OEM parts from Kawasaki can be more expensive than aftermarket alternatives, especially if purchasing directly from the manufacturer or authorized dealers.

2. **Limited Customization** Unlike aftermarket parts, these components do not offer performance upgrades (e.g., higher compression pistons, forged rods, or lightweight crankshafts).

3. **Potential for Overkill** If the engine is already in good condition, replacing only these parts may not be necessary, making the purchase less cost-effective.

4. **Installation Complexity** Removing and reinstalling the crankshaft, piston, and connecting rod requires mechanical skill, specialized tools, and time, which may not be feasible for inexperienced DIYers.

5. **Availability Issues** Depending on location, these parts may not be readily available, requiring online purchases or waiting for shipments.

6. **No Performance Gains Without Modifications** Simply replacing worn parts will restore stock performance but will not improve it unless additional upgrades (e.g., camshafts, carburetor tuning) are made.

7. **Potential for Counterfeit Parts** If purchasing from untrusted sources, there is a risk of receiving fake or low-quality replicas that could damage the engine.

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### **Conclusion**

Buying genuine Kawasaki OEM crankshaft, piston, and connecting rod assemblies for a 2006-2008 KX250F is a reliable choice if the goal is to restore the engine to factory specifications or replace worn components. These parts offer durability, compatibility, and peace of mind but come at a higher cost than aftermarket alternatives. They are ideal for serious riders or restorers who prioritize quality and longevity over performance gains.

However, if the budget is tight or the engine is already in decent condition, considering aftermarket options (e.g., JE, K&N, or reputable brands like Yoshi s or DID) may be more practical. Additionally, if the engine is being heavily modified, aftermarket parts with performance enhancements might be preferable.

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### **Recommendation**

- You need exact factory replacements for a restoration or reliability project.

- You want to avoid compatibility issues and ensure long-term durability.

- You are willing to pay a premium for brand assurance and warranty coverage.

- You are on a budget and can find high-quality, reputable aftermarket parts (e.g., forged rods, high-compression pistons).

- You plan to modify the engine further and want parts that can handle increased stress.

- You lack the mechanical expertise or time to install OEM components properly.

For the best value, research aftermarket options from trusted brands and compare prices. If in doubt, consult a mechanic or Kawasaki specialist to confirm whether OEM parts are necessary or if aftermarket upgrades would better suit your goals.

Details:

Connecting rod has no up and down free play. Crankshaft was removed from engine with a right side crank bearing failure. Threads are good. Standard bore piston.

Has very little side to play. No hammers were used during removal from engine. Connecting rod bearing feels good.

part #: 130310074 prices

• $115.00-$209.95

specifications cyclevintagee:

• for models: Kx250f
• for makes: Kawasaki
• for years: 2006-2008
• mpn: 13031-0074
• part type: Crankshaft Piston Rod
• oe/oem part number: 13031-0074 13001-0088
• compatible year: 2006, 2007, 2008
• country of origin: Japan

offer cyclevintagee:

• options: Ship-to-home
• started: May 3, 2026
• quantity: 1
• sold: 0
• availability: In Stock
• best offers: True

payments cyclevintagee:

• money order
• credit card: Diners-club
• wallet: Google-pay
• other

general cyclevintagee:

• condition: For parts or not working
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

seller cyclevintagee:

• # reviews: 205
• rating: 100.0%
• city: Holley, New York

returns cyclevintagee:

• policy: No Returns

shipping cyclevintagee:

• carrier: USPS
• type: Calculated
• transit: 4-10 Days
• service: USPS Ground Advantage
• cost: $14.48
• class: Standard

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