YAMAHA 43700 Engine Motor Cylinder Head

( Manufacturer Part Number: 43700 ), ( Engine Type: 2-stroke ), ( Type: Cylinder Head ), ( Material: Aluminum ), ( Vintage Part: Yes )

Review YAMAHA Engine Motor Cylinder Head fits MX100 1974

The Yamaha 43700 1974 MX100 engine cylinder head is a crucial component of the two-stroke, air-cooled, reed-valve engine found in various models of Yamaha motorcycles from the 1970s. This cylinder head is specifically designed for the MX100 engine, which was popularly used in motocross and enduro bikes during that era.

The cylinder head is constructed primarily from aluminum alloy, which contributes to its lightweight yet robust design. It houses four combustion chambers, each with a transfer port that facilitates the efficient transfer of fuel-air mixture from the crankcase to the combustion chamber. This design is essential for the two-stroke engine's proper functioning, as it allows for continuous fuel supply during the power stroke.

The cylinder head features four inlet valves and four exhaust valves, which are actuated by the reed valves located in the crankcase. The intake and exhaust ports are finned to promote efficient heat dissipation. The inlet valves are 22mm in diameter, while the exhaust valves are slightly larger at 24mm in diameter. The valves are made of durable steel material, ensuring reliable performance even under high RPM conditions.

The cylinder head comes with pre-installed, adjustable valve clearance shims. Valve clearance adjustment is an essential part of regular engine maintenance, as it ensures proper valve function and engine performance. The shims can be easily accessed by removing the cylinder head cover, making the adjustment process straightforward.

The surface finish of the cylinder head is essential for optimal engine performance. The OEM finish is a polished, mirror-like surface that minimizes friction and promotes efficient heat transfer. The cylinder head also features a gasket surface for sealing the head to the engine block.

In summary, the Yamaha 43700 1974 MX100 engine cylinder head is a vital component for maintaining the performance and reliability of your classic Yamaha motocross or enduro bike. Its lightweight, robust design, efficient heat dissipation, and easy valve clearance adjustment make it a preferred choice among enthusiasts and collectors.

Buying a used Yamaha MX100 engine cylinder head, such as the Yamaha 43700 from 1974, can be a cost-effective solution for restoring an old motorcycle or for those who enjoy working on engines. However, like any used part, it comes with its advantages and disadvantages.

1. Cost-effective: Purchasing a used cylinder head is often more affordable than buying a new one.

2. Availability: Used parts are more readily available than new ones, especially for older models.

3. Character: Using a used part maintains the authenticity of the motorcycle and adds to its history.

1. Unknown condition: The condition of the used cylinder head is unknown, and it may require additional work or repairs.

2. Compatibility: There is a risk that the used cylinder head may not be a perfect fit, requiring additional modifications.

3. Wear and tear: The used cylinder head may have signs of wear and tear, which could impact its performance or longevity.

When considering buying a used Yamaha MX100 engine cylinder head, it's essential to weigh the pros and cons carefully. If you're comfortable with the potential risks and are willing to put in the time and effort to repair or modify the part, then buying a used cylinder head could be a cost-effective solution. However, if you prefer a new, guaranteed-to-fit part and aren't comfortable with the uncertainty that comes with a used part, then it may be worth investing in a new cylinder head instead. Ultimately, the decision comes down to your budget, time constraints, and comfort level with working on engines.

If you decide to buy a used Yamaha MX100 engine cylinder head, be sure to inspect it thoroughly before making the purchase. Check for signs of wear and damage, and make sure it's compatible with your motorcycle model. If possible, try to purchase the cylinder head from a reputable seller or dealer to increase the chances of getting a quality part. Additionally, be prepared for the possibility of additional repairs or modifications. If you're not comfortable with this, consider purchasing a new cylinder head instead.

Details:

This cylinder head. The 1975 Yamaha MX100 Engine Motor Cylinder Head is a genuine OEM part designed specifically for 2-stroke engines.

part #: 43700 price

• $65.00

specifications cylindermotorcycleiz:

• for models: Mx100
• for makes: Yamaha
• for years: 1974
• mpn: 43700
• engine type: 2-stroke
• type: Cylinder Head
• material: Aluminum
• vintage part: Yes

payments cylindermotorcycleiz:

• other
• credit card: Diners-club
• wallet: Paypal

offer cylindermotorcycleiz:

• options: Ship-to-home
• sold: 0
• quantity: 1
• best offers: True
• availability: In Stock
• started: December 6, 2025

shipping cylindermotorcycleiz:

• cost: $46.59
• carrier: UPS
• type: Calculated
• transit: 4-9 Days
• class: Standard
• service: UPS Ground

seller cylindermotorcycleiz:

• # reviews: 19
• rating: 100.0%
• city: Salem, Massachusetts

returns cylindermotorcycleiz:

• policy: No Returns

general cylindermotorcycleiz:

• condition: Used
• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Cylinder Heads

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