YAMAHA 305-11311-00-00 Cylinder Head Bolts 100CC AF05E
fits model: Lt2, Ltm2, Enduro. make: Yamaha. year: 1972–1973.
( Part Type: Cylinder Head Bolt ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 305113110000 )
Review YAMAHA Oem 100 Cylinder Head And Bolts 100cc fits ENDURO LT2 LTM2 1972–1973
The **Yamaha LT2 Cylinder Head Bolts (Part Number: 305-11311-00-00)** are precision-engineered fasteners specifically designed for the iconic **1972 and 1973 Yamaha Enduro LTM2 100cc** models, including the **AF05E** variant. These bolts are crafted from high-grade, heat-treated steel to ensure exceptional durability and resistance to the extreme stresses encountered during off-road riding. Engineered to Yamaha s exacting standards, they feature a **fine-threaded design** that guarantees a secure, leak-proof seal when properly torqued, preventing cylinder head gasket blowouts a critical failure point in high-performance or heavily ridden motorcycles. The bolts are **chrome-plated** for added corrosion resistance, making them ideal for use in rugged environments where exposure to dirt, moisture, and varying temperatures is common. Their **standard 11mm head diameter** and **M12 x 1.25mm thread pitch** ensure a perfect fit with the original cylinder head mounting surfaces, maintaining the engine s structural integrity while allowing for proper compression and power output. Whether you're restoring a classic LTM2 to its original glory or performing routine maintenance, these bolts are an essential replacement part that upholds the reliability and performance for which Yamaha s early off-road bikes were renowned. Always follow Yamaha s recommended torque specifications to avoid overtightening, which could compromise the cylinder head s sealing surface or warp the head over time.
### **Pros and Cons of Buying Yamaha 305-11311-00-00 LT2 Cylinder Head Bolts (1972 1973 Enduro LTM2, 100cc, AF05E)**
#### **Pros:**1. **Authentic Fitment** These bolts are designed specifically for the Yamaha LTM2 (AF05E) engine, ensuring proper alignment and torque specifications. Using non-OEM parts could lead to leaks, compression loss, or even catastrophic failure.
2. **Reliability and Durability** Yamaha s original parts are built to withstand the stress of high-performance off-road use. High-quality steel and precise threading prevent stripping or loosening under vibration.
3. **Ease of Installation** Since they are genuine, they should fit without modification. No need for adapters or custom machining, which simplifies the repair process.
4. **Compatibility with Aftermarket Upgrades** If you plan to modify the engine (e.g., porting, cam upgrades, or compression changes), OEM bolts provide a solid foundation for these modifications.
5. **Warranty Coverage (if purchased new)** If buying directly from Yamaha or an authorized dealer, these bolts may still be under warranty, offering peace of mind against defects.
6. **Prevents Future Issues** Loose or incorrect bolts can lead to warped cylinder heads, blown head gaskets, or even engine damage. Using the right bolts from the start avoids these risks.
7. **Resale Value** If you later sell the bike, having OEM parts can make it more appealing to collectors or restorers who prefer authenticity.
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#### **Cons:**1. **Cost** Genuine Yamaha parts are more expensive than aftermarket alternatives. These bolts may cost significantly more than generic or third-party replacements, which could be a barrier for budget-conscious buyers.
2. **Limited Availability** Finding these exact bolts may require ordering from a specialty motorcycle parts dealer, Yamaha s official parts department, or an online marketplace. They may not be stocked at local bike shops.
3. **Potential for Overkill** If the bolts are only slightly loose or worn (rather than seized or damaged), replacing them may be unnecessary. In some cases, cleaning and retorquing could suffice.
4. **Risk of Counterfeit Parts** If purchasing from a third-party seller (e.g., eBay, Facebook Marketplace), there s a chance of receiving fakes or mismatched parts. Always verify authenticity with the seller.
5. **Time-Consuming to Source** Compared to aftermarket bolts, which are widely available, tracking down OEM Yamaha parts may take longer, especially for older models.
6. **No Performance Advantage** Unless the bolts are specifically upgraded (e.g., high-strength or ARP-style), these are standard parts. They won t improve power or durability beyond the original design.
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### **Conclusion**
Buying the **Yamaha 305-11311-00-00 LT2 cylinder head bolts** for your 1972 1973 LTM2 is the **best choice for authenticity, reliability, and long-term engine health**. While they come at a higher cost and may require effort to source, the risks of using incorrect or inferior bolts such as head warpage, leaks, or engine failure far outweigh the drawbacks. These bolts are a **critical component for maintaining the integrity of your engine**, especially if you plan to run the bike at high RPMs or with modifications.
If budget is a concern, **aftermarket bolts from reputable brands (e.g., ARP, Mucoff, or Yamaha-compatible high-strength bolts)** can be a cost-effective alternative, provided they meet or exceed the original torque specifications. However, for a **true restoration or high-performance build**, OEM parts are the safest and most reliable option.
### **Recommendation**
- **If restoring or maintaining originality:** Purchase the **Yamaha 305-11311-00-00 bolts** from an authorized dealer or Yamaha s official parts site. Verify the part number matches your engine code (AF05E).
- **If on a budget and bolts are only slightly worn:** Consider **high-quality aftermarket bolts** (e.g., ARP or Mucoff) that are Yamaha-compatible and meet or exceed OEM specs.
- **If unsure about condition:** Inspect the existing bolts for cracks, corrosion, or improper threading. If they re in good shape, retorqueing with a torque wrench may suffice.
- **Always use a torque wrench** when installing cylinder head bolts to avoid overtightening, which can damage the head or threads.
For the **long-term health of your LTM2**, investing in the correct OEM bolts is a **wise decision** that will prevent costly repairs down the line.
Details:
Features: Authentic Vintage Part: Features the original factory casting marks 425700 / KD-1. Ready for Service: The mating surface is flat and the internal chamber carbon-free ready installation. Perfect for a vintage Yamaha restoration or as high-quality spare your rider. Structural Integrity: Hard-to-find no-break condition no snapped fins, which is common on these old trail bikes.
For sale is an original OEM Yamaha cylinder head removed from a 1972-1973 LT2 100cc Enduro. Complete Hardware: Comes with the four original factory head bolts, saving you trouble of sourcing vintage-correct hardware. Please see all photos for the exact physical condition.
part #: 305113110000 prices
- $48.79-$109.99
specifications cyclevintagee:
- for models: Lt2, Ltm2, Enduro
- for makes: Yamaha
- for years: 1972-1973
- part type: Cylinder Head Bolt
- vintage part: Yes
- country of origin: Japan
- upc: 305113110000
payments cyclevintagee:
- wallet: Apple-pay
- other
- credit card: Diners-club
returns cyclevintagee:
- time: 30 Days
- policy: Returns Accepted
- paid by: Seller
offer cyclevintagee:
- sold: 0
- options: Ship-to-home
- best offers: True
- availability: In Stock
- started: April 6, 2026
- quantity: 1
general cyclevintagee:
- Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
- condition: Used
shipping cyclevintagee:
- cost: $10.70
- service: FedEx Ground Economy, USPS Ground Advantage, UPS Ground Saver
- transit: 4-9 Days
- class: Economy, Standard
- carrier: FedEx, USPS, UPS
- type: Calculated
seller cyclevintagee:
- # reviews: 424
- rating: 100.0%
- city: Spring Hill, Florida
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