HONDA 11100-287-110 Upper Lower Crankcase Engine Motor Block 68

( Manufacturer Part Number: 11100-287-110 ), ( Part Type: Engine Motor Block ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review HONDA 68 Upper Lower Crankcase Engine Motor Block fits CB350KZ CB 350 1970–1971

The **Honda 11100-287-110** is a meticulously crafted, high-performance **CB350KZ/CB350** upper and lower crankcase assembly from the legendary 1970s era, specifically designed for the **1970, 1971, 1972, and 1973** models of Honda s iconic **CB350KZ** and **CB350** motorcycles. This essential component forms the foundational heart of the engine, housing the crankshaft, connecting rods, and main bearings while providing structural integrity to the powerplant. Crafted from **high-grade cast iron**, the crankcase is precision-machined to Honda s original specifications, ensuring seamless compatibility with the rest of the engine assembly, including the **piston, cylinder, and camshaft components**. The **upper crankcase** features the **crankshaft housing**, complete with oil passages and mounting surfaces for the **camshaft bearings**, while the **lower crankcase** integrates the **oil sump**, providing a reservoir for lubrication and housing the **crankshaft seals** to prevent oil leakage. This assembly is a critical replacement part for riders seeking to restore their classic CB350KZ or CB350 to peak performance, offering a durable and reliable alternative to worn or damaged original components. Whether used for a full engine rebuild or as a standalone repair, this **OEM-quality crankcase** ensures smooth operation, optimal power delivery, and long-term reliability perfect for enthusiasts who demand authenticity and performance in their vintage Honda.

### **Pros and Cons of Buying a 1970-71 Honda CB350KZ/CB350 Upper/Lower Crankcase and Engine Block (Part Number: 11100-287-110)**

#### **Pros**

1. **Reliability and Durability** Honda s early 1970s engines, particularly the CB350 series, are known for their robust construction. The cast-iron crankcase and block are designed to withstand heavy use, making them a solid choice for restoration or replacement.

2. **Availability of Parts** As a classic Honda model, the CB350KZ/CB350 has a strong aftermarket support system. While some original parts may be rare, the crankcase and engine block (11100-287-110) are relatively common in used condition, making sourcing easier than for more obscure models.

3. **Restoration Potential** If you re restoring a CB350, these components can be a cost-effective way to rebuild the engine without relying on a fully original or rebuilt unit. Many mechanics and restorers prefer using these parts due to their durability.

4. **Compatibility** The 11100-287-110 crankcase and block fit the CB350KZ (1970-71) and early CB350 models (1968-70). If you re working on a bike with a damaged or worn engine, this is a direct replacement option.

5. **Lower Cost Than New or Rebuilt Units** Purchasing a used crankcase and block is significantly cheaper than buying a fully rebuilt engine or a new one, making it a budget-friendly choice for enthusiasts.

6. **Classic Bike Appeal** For collectors and riders who appreciate the vintage look and feel of the CB350, using original or period-correct parts adds authenticity to the restoration.

7. **Ease of Machining and Modification** The cast-iron construction allows for machining adjustments (such as porting or balancing) if needed, giving riders more flexibility in tuning the engine.

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#### **Cons**

1. **Potential for Wear and Damage** Since these parts are used, there s a risk of hidden damage, such as cracks in the crankcase, worn bearing surfaces, or corrosion in the block. A thorough inspection (including magnaflux testing for cracks) is essential before purchase.

2. **Inconsistent Condition** The quality of used parts varies widely. Some may have been well-maintained, while others may have been neglected, leading to premature failure if not properly inspected or rebuilt.

3. **Limited Warranty or Guarantee** Unlike new or rebuilt units, used parts typically come with no warranty. If issues arise after installation, you ll be responsible for repairs.

4. **Time-Consuming Rebuild** Even if the crankcase and block are in good condition, rebuilding the engine around them can be labor-intensive, requiring expertise in machining, balancing, and assembly.

5. **Risk of Mismatched Components** If the parts don t align perfectly with the rest of the engine (e.g., crankshaft, pistons, or timing components), additional machining or custom work may be needed, increasing costs.

6. **Depreciation** Used parts lose value over time, and if you later decide to sell the bike or parts, you may not recover much of your investment.

7. **Environmental Concerns** Older cast-iron parts may contain lead or other hazardous materials, requiring careful handling and disposal if they re damaged or unusable.

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### **Conclusion**

Buying a used **Honda 11100-287-110 crankcase and engine block** for a CB350KZ/CB350 (1968-71) can be a **cost-effective and rewarding** choice if you re restoring a bike, seeking a budget-friendly engine rebuild, or appreciate classic motorcycle parts. The reliability of Honda s early designs and the availability of these components make them a practical option for many riders.

However, the **risks of hidden damage, inconsistent quality, and the need for careful inspection** mean that this purchase requires **due diligence**. If you re not experienced in engine rebuilds, consider consulting a mechanic before committing. Alternatively, if budget allows, a **rebuilt or remanufactured engine** from a trusted source may offer better long-term reliability with some added peace of mind.

For **enthusiasts on a tight budget** who are willing to put in the work, these parts can be an excellent investment. For those seeking **convenience and warranty protection**, a rebuilt unit might be the safer choice.

### **Recommendation**

- **If you re restoring a CB350KZ/CB350 and have mechanical experience**, purchasing a used **11100-287-110 crankcase and block** can be a smart, cost-effective move **provided you inspect it thoroughly** (look for cracks, warping, and wear) and are prepared for a rebuild.

- **If you lack experience or time for a full rebuild**, consider buying a **rebuilt CB350 engine** from a reputable dealer to ensure reliability.

- **Always verify compatibility** with your specific model year and check for **hidden damage** before purchasing.

- **Weigh the long-term value** if this is for a project bike, the used parts may be ideal. If it s for daily riding, a rebuilt unit may be worth the extra cost.

Ultimately, the decision depends on your **budget, skills, and goals** for the bike. For most riders, a **balanced approach** combining used parts with professional inspection will yield the best results.

Details:

This item has two broken parts on the bottom. HONDA 1968 CL350 A SCRAMBLER 350 UPPER CRANKCASE. HONDA 1968 CB350 A SUPER SPORT 350 UPPER CRANKCASE. YOU'RE VIEWING AN UPPER AND LOWER CRANKCASE BLOCK THAT HAS BEEN REMOVED FROM A HONDA 1970 CB350KZ WITH UNKNOWN MILEAGE.

part #: 11100287110 prices

• $79.99-$149.99

specifications cyclevintagee:

• for models: Cb350kz, Cb, 350
• for makes: Honda
• for years: 1970-1971
• mpn: 11100-287-110
• part type: Engine Motor Block
• vintage part: Yes
• country of origin: United States

general cyclevintagee:

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

payments cyclevintagee:

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

seller cyclevintagee:

• city: Milwaukee, Wisconsin
• # reviews: 21066
• rating: 99.9%

shipping cyclevintagee:

• type: Fixed
• transit: 5-11 Days
• class: Standard
• service: UPS Ground
• cost: $49.99
• carrier: UPS

returns cyclevintagee:

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

offer cyclevintagee:

• sold: 0
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: March 14, 2026

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