HONDA 11200-381-010 Mr Left Crankcase Crank

( Manufacturer Part Number: 11200-381-010 ), ( Part Type: Crank Case ), ( Vintage Part: Yes ), ( Country Of Origin: Japan )

Review HONDA Mr Left Crankcase Crank Case fits CR250 MR250 CR 250 1976

The **Honda 11200-381-010** is a meticulously engineered, high-performance **1976 CR250/CR-MR250/CR-MR 250 left crankcase**, a critical component integral to the legendary reliability and thrilling performance of Honda s iconic off-road motorcycles from the mid-1970s. Crafted from precision-machined **cast aluminum**, this crankcase is designed to house the engine s lower unit, including the crankshaft, connecting rods, and primary drive components, while also serving as the foundation for the motorcycle s suspension and frame attachment points. The **left-side crankcase** distinguished by its unique shape and mounting features plays a pivotal role in the engine s smooth operation, housing the **crankshaft bearings, oil passages, and the primary chain drive mechanism** that transfers power from the engine to the transmission. Its robust construction ensures durability under the demanding conditions of motocross, enduro, and trail riding, where vibrations, impacts, and extreme temperatures are constant challenges.

This particular crankcase is a **direct-fit replacement part**, meticulously designed to match the original specifications of the **CR250, CR-MR250, and CR-MR 250** models from 1976, ensuring seamless integration with the engine s upper crankcase (11200-381-009) and other associated components. The **internal oil galleries and crankshaft journals** are precision-bored and polished to Honda s exacting standards, guaranteeing optimal lubrication and minimal friction, which is essential for maintaining peak performance and longevity. The **left-side mounting flange** is reinforced to securely attach to the motorcycle s frame, while the **primary chain drive housing** is engineered to house the sprocket and chain with minimal play, reducing wear and ensuring efficient power transfer.

For restoration enthusiasts and performance tuners, this crankcase is not only a functional replacement but also a **collector s piece**, embodying the engineering brilliance of Honda s early off-road dominance. Its **smooth, machined surfaces** and **tight tolerances** reflect the precision manufacturing techniques of the era, making it a sought-after part for those seeking to restore or modify their classic Honda to its original glory. Whether used in a **fully restored race-ready CR250** or a custom-built project bike, this crankcase delivers the reliability and performance that Honda s legendary 250cc two-stroke engines are renowned for. Its inclusion in a rebuild ensures that the engine operates with the same **smoothness, power, and durability** that made these bikes legends in their time.

Buying a **1976 Honda CR250/CR250 MR/CR-MR250 left crankcase (part number 11200-381-010)** involves several considerations, as this is a critical component for restoring or repairing an older Honda off-road motorcycle. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Part**

1. **Authentic OEM Replacement**

The 1976 Honda crankcase is an original equipment part, meaning it was designed specifically for the CR250/CR-MR250 series. This ensures a perfect fit in terms of dimensions, bolt patterns, and internal geometry, which is crucial for proper engine function. Aftermarket or non-genuine parts may not align as precisely, potentially leading to performance issues or premature wear.

2. **Reliability and Durability**

Honda s early off-road engines were built to last with proper maintenance. A genuine crankcase from this era is made from high-quality cast iron, which is robust and resistant to wear over time. If sourced from a reputable seller, it should be free from major cracks or internal damage, providing a solid foundation for engine rebuilds.

3. **Compatibility with Classic Engines**

The 1976 CR250/CR-MR250 crankcase is compatible with other models in the same series (e.g., CR250R, CR-MR250) and can often be used in later models with minor modifications (e.g., adjusting valve timing or carburetion). This makes it a versatile part for collectors or restorers working on multiple bikes.

4. **Easier to Source Genuine Components**

While parts for older Hondas can be scarce, the crankcase is a relatively common component compared to other engine parts like pistons or connecting rods. Dealers, junkyards, or online marketplaces (e.g., eBay, Facebook Marketplace) often carry these, increasing the likelihood of finding a suitable unit.

5. **Potential for Engine Rebuilding**

If you re rebuilding an engine, a used but serviceable crankcase can be a cost-effective alternative to a brand-new one. With proper machining (e.g., balancing, honing the crankshaft journals), it can perform as well as new, extending the life of your project.

6. **Historical and Collectible Value**

For enthusiasts restoring classic bikes, a genuine 1976 crankcase adds authenticity and value to the project. It s a tangible piece of motorcycle history that aligns with the bike s original specifications, appealing to purists and collectors.

7. **Lower Cost Than New OEM Parts**

While not always cheap, a used crankcase is significantly less expensive than purchasing a brand-new one from Honda or an authorized dealer. This makes it accessible for budget-conscious restorers.

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### **Cons of buying a Part**

1. **Age-Related Wear and Potential Damage**

The part is over 40 years old, which means it may have been subjected to rust, corrosion, or mechanical stress. Even if the seller claims it s "good," you should inspect it thoroughly for:

- **Cracks** (especially around the oil passages or crankshaft bores).

- **Corrosion** (pitting or flaking on the internal surfaces).

- **Misalignment** (warped crankcase halves or improperly mated surfaces).

A damaged crankcase can lead to oil leaks, poor sealing, or even catastrophic engine failure if not addressed.

2. **Limited Availability of Genuine Parts**

While not rare, finding a **fully serviceable** 1976 Honda crankcase can be challenging. Many sellers may offer parts that are incomplete (missing gaskets, bolts, or internal components) or require additional machining (e.g., crankshaft balancing). This can add unexpected time and cost to your project.

3. **Machining and Preparation Required**

- **Crankshaft journal honing** (to ensure proper fit and lubrication).

- **Balancing** (to prevent vibration and engine damage).

- **Sealing surface refurbishment** (if the halves don t mate perfectly).

These tasks require specialized tools and expertise, which may not be available to DIYers. Hiring a machine shop can add significant cost.

4. **Compatibility Issues with Modern Components**

If you re mixing the 1976 crankcase with newer or aftermarket parts (e.g., a modern crankshaft, pistons, or bearings), you may encounter fitment issues. For example:

- The crankshaft bore diameter might not match newer crankshafts.

- Oil passages or bolt patterns could differ slightly, requiring custom machining.

This can complicate the rebuild and may void warranties on aftermarket components.

5. **Risk of Counterfeit or Mismatched Parts**

The aftermarket for classic Honda parts is not always regulated. Some sellers may offer "Honda" parts that are actually knockoffs or repurposed from other models. Always verify the part number (11200-381-010) and inspect the casting for authenticity (e.g., Honda logos, serial numbers).

6. **Time-Consuming Restoration Process**

- **Internal components** (crankshaft, rods, pistons, bearings).

- **Seals and gaskets** (often obsolete and hard to find).

- **Tools** (e.g., crankshaft puller, micrometer, torque wrench).

This process can take weeks or months, depending on your experience level.

7. **Potential for Hidden Costs**

- **Transportation** (if shipping from a distant seller).

- **Inspection by a mechanic** (to verify its condition).

- **Machining or refurbishment** (if the part needs work).

These costs can quickly add up, making the project less cost-effective than anticipated.

8. **Environmental and Ethical Concerns**

If the crankcase comes from a salvaged bike, consider the environmental impact of stripping it. Some sellers may not responsibly dispose of the rest of the motorcycle, contributing to waste. Supporting ethical salvage yards or dealers can mitigate this issue.

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### **Conclusion**

Buying a **1976 Honda 11200-381-010 crankcase** can be a worthwhile investment if you re restoring a classic CR250/CR-MR250 and prioritize authenticity, reliability, and long-term performance. However, it comes with risks primarily related to the part s age, potential damage, and the need for additional work to make it functional.

- **Your budget** (are you willing to spend extra on machining or new components?).

- **Your mechanical skill level** (can you inspect, clean, and rebuild the engine yourself?).

- **Your goals** (do you want a fully restored bike or a project with historical value?).

- **Availability** (can you find a high-quality, verified part without excessive searching?).

If you re confident in your ability to source a **sound, well-documented crankcase** and are prepared for the labor and potential costs of refurbishment, it s a solid choice for authenticity. However, if you re on a tight budget or lack experience, consider alternatives like:

- **A rebuilt engine** from a trusted dealer (though these are rare and expensive).

- **A newer but compatible crankcase** (e.g., from a later CR250 model with minor modifications).

- **An aftermarket crankcase** (if you re open to non-genuine options, though fitment must be verified).

---

### **Recommendation**

1. **Verify the Part s Condition Thoroughly**

- Inspect for cracks, corrosion, or warping. If possible, have a mechanic or machinist assess it before purchase.

- Request **photos or a video** of the part in person (if buying online) to confirm its integrity.

- Check for **complete documentation** (e.g., original Honda sticker, serial number matching the bike s engine number).

2. **Source from a Reputable Seller**

- Prefer **Honda-authorized dealers, classic bike specialists, or trusted junkyards** over random online listings.

- Look for sellers who offer **warranties or return policies** (even for used parts).

- Join **classic Honda forums** (e.g., Honda Forums, CRF250X forums) to ask for recommendations on where to buy.

3. **Budget for Additional Costs**

- Account for **machining, new seals, gaskets, and labor** if you re not doing the work yourself.

- Consider whether the **time investment** aligns with your project timeline.

4. **Alternative Options**

- If the crankcase is too risky, explore **rebuilt engines** from companies like **Honda Performance Parts** or **classic bike rebuilders**.

- For a balance between cost and authenticity, look for **later-model CR250 crankcases** (e.g., 1980s) that may be easier to source and compatible with minor adjustments.

5. **Proceed with Caution**

- Treat this as a **long-term project** rather than a quick fix. The payoff in a fully restored, authentic bike is worth the effort

Details:

CAME OFF A 1976 HONDA MR250 ENGINE# MR250E-1004397 PLEASE SEE PICTURES FOR CONDITION AND WHATS INCLUDED.

part #: 11200381010 prices

• $148.50-$519.00

specifications cyclevintagee:

• for models: Cr250, Mr250, Cr, 250
• for makes: Honda
• for years: 1976
• mpn: 11200-381-010
• part type: Crank Case
• vintage part: Yes
• country of origin: Japan

payments cyclevintagee:

• credit card: Visa
• other
• wallet: Apple-pay

seller cyclevintagee:

• city: Spokane, Washington
• rating: 100.0%
• # reviews: 2866

shipping cyclevintagee:

• class: Standard
• type: Calculated
• cost: $0.00
• carrier: USPS
• service: USPS Ground Advantage
• transit: 3-7 Days

offer cyclevintagee:

• sold: 0
• quantity: 1
• started: February 23, 2026
• availability: In Stock
• best offers: True
• options: Ship-to-home

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

returns cyclevintagee:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

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