HONDA 645B-KE Carburetor

( Engine Type: 4-stroke ), ( Choke Type: Mechanical ), ( Type: Carburetor ), ( Machine Type: Dual Sport Motorcycle ), ( Manufacturer Part Number: 645B-KE ), ( Universal Fitment: No ), ( Vintage Part: Yes ), ( Country Of Origin: Japan )

Review HONDA Carburetor Oem Original Used Condition Good fits XL250 1972–1975

The Honda 645B-KE carburetor was used on Honda XL250 motorcycles manufactured between 1972 and 1975. This is a vintage carburetor that requires precise adjustments to deliver optimal performance.

The Honda 645B-KE is a constant-depression type carburetor, which means that the float bowls are always at a constant level. This design ensures consistent fuel delivery to the engine, even under varying riding conditions. The carburetor features a single 250cc venturi, which is the size of the throat or opening of the carburetor.

The carburetor comes with a manual choke system, which allows the rider to manually control the choke to assist in starting the engine. The choke mechanism works by closing the main jet, allowing more fuel to flow into the idle jet, which enriches the fuel mixture and makes it easier to start the engine.

The Honda 645B-KE carburetor also features an automatic petcock, which is a fuel valve that automatically shuts off fuel flow when the engine is not running. This is an essential safety feature that prevents fuel spills and potential fires.

The carburetor comes with adjustable idle mixture screws, which allow the rider to fine-tune the fuel mixture for optimal engine performance. The idle jet can also be adjusted to ensure proper idle speed.

The Honda 645B-KE carburetor is a complex piece of machinery that requires careful adjustment and maintenance to ensure proper operation. It is recommended that this carburetor is serviced by a qualified technician to ensure that it is in good working order.

In summary, the Honda 645B-KE carburetor is a vintage component that was used on Honda XL250 motorcycles between 1972 and 1975. It is a constant-depression type carburetor with a single venturi, manual choke system, and automatic petcock. It requires precise adjustments for optimal performance and should be serviced by a qualified technician.

The Honda 645B-KE XL250 carburetor was used in various Honda motorcycle models between 1972 and 1975. Here are some pros and cons that might help you decide whether to buy this particular carburetor:

1. Reliability: Honda is known for its durability and high-quality parts. This carburetor, being a Honda product, is likely to be reliable and long-lasting.

2. Availability: The Honda 645B-KE XL250 carburetor is a common part and can be easily found in various aftermarket stores, both online and offline.

3. Affordability: Compared to some other motorcycle carburetors, the Honda 645B-KE XL250 is relatively affordable, making it an attractive option for budget-conscious buyers.

4. Easy to Install: The installation process for this carburetor is generally straightforward, making it a good choice for DIY motorcycle enthusiasts.

5. Fuel Efficiency: The Honda 645B-KE XL250 carburetor is known to improve fuel efficiency, which can save riders money on gas over the long run.

1. Age: Being a part from the 1970s, this carburetor may not meet the latest emissions standards, which could be a problem for some riders.

2. Performance: Some users have reported that the Honda 645B-KE XL250 carburetor may not provide the best performance, particularly in terms of throttle response and power delivery.

3. Complexity: While the installation process is straightforward, the carburetor itself can be quite complex, which may make it a challenge for some riders to tune and maintain.

4. Potential Issues: Like any other used motorcycle part, the Honda 645B-KE XL250 carburetor may have some underlying issues that could require additional repair or maintenance costs.

The Honda 645B-KE XL250 carburetor is a reliable and affordable option for motorcycle enthusiasts looking to restore or maintain a classic Honda motorcycle from the 1970s. While it may not offer the latest in emissions technology or performance, its ease of availability, installation, and fuel efficiency make it a worthwhile consideration. However, potential buyers should be aware of the potential issues that come with using a used part and be prepared to invest time and resources into tuning and maintaining the carburetor.

If you are in the market for a carburetor for a classic Honda motorcycle from the 1970s and are looking for an affordable and reliable option, the Honda 645B-KE XL250 carburetor is a good choice. However, be sure to thoroughly research the carburetor and its potential issues before making a purchase, and be prepared to invest time and resources into tuning and maintaining it to ensure optimal performance.

part # 645b prices

• $120.00-$202.50

specifications iodacarb:

• for models: Xl250
• for makes: Honda
• for years: 1972-1975
• engine type: 4-stroke
• choke type: Mechanical
• type: Carburetor
• machine type: Dual Sport Motorcycle
• manufacturer part number: 645B-KE
• universal fitment: No
• vintage part: Yes
• country of origin: Japan

payments iodacarb:

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

offer iodacarb:

• availability: In Stock
• sold: 0
• started: November 15, 2025
• quantity: 1
• options: Ship-to-home

seller iodacarb:

• rating: 100.0%
• # reviews: 434

returns iodacarb:

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

general iodacarb:

• condition: Used
• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Carburetors

shipping iodacarb:

• transit: 4-9 Days
• service: USPS Ground Advantage
• type: Fixed
• class: Standard
• carrier: USPS
• cost: $11.34

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