fits model: Rd350, R5, 250, 350. make: Yamaha. year: 1970–1975.

( Part Type: Crank Shaft ), ( UPC: 360114000000 )
The Yamaha RD350 crankshaft is a vital component of the iconic RD350, RD250, DS7, and R5 motorcycles produced between 1970 and 1975. This crankshaft is a testament to Yamaha's engineering prowess and its commitment to delivering high-performance parts.
The crankshaft is a robust, forged steel component, designed to withstand the rigors of high-speed, high-revving engines. It features a precision-machined, polished finish, which not only enhances its aesthetic appeal but also reduces friction, thereby improving engine efficiency and power delivery.
The crankshaft is equipped with a primary drive gear and a countershaft sprocket, both of which are integral to the bike's transmission system. The primary drive gear engages with the engine's crankshaft, while the countershaft sprocket drives the rear wheel through the chain. The gears are designed for smooth operation and long-lasting performance.
The crankshaft also houses the crankshaft bearings, which ensure a smooth, frictionless rotation of the crankshaft within the engine block. The bearings are high-quality, self-lubricating materials that can withstand the high loads and temperatures generated by the engine.
The RD350 crankshaft is a direct replacement for the original part, ensuring a perfect fit and easy installation. It is designed to meet the original specifications, ensuring that the engine performs as intended. This crankshaft is a must-have for any enthusiast restoring a classic RD350, RD250, DS7, or R5, or for anyone looking to upgrade their bike's performance.
Pros of buying a Yamaha RD350 (RD350, RD250 DS7, RD5, models from 1970-1975):1. Classic Appeal: These bikes are known for their retro design, which has a strong following among enthusiasts and collectors.
2. Reliability: The air-cooled, two-stroke engines of these bikes are known for their simplicity and reliability.
3. Power and Performance: The bikes offer a good power-to-weight ratio, making them fun to ride.
4. Affordability: Compared to modern bikes, these vintage Yamahas are often more affordable, making them an attractive option for budget-conscious buyers.
5. Customizability: Due to their popularity, there are numerous aftermarket parts and accessories available for these bikes, allowing owners to customize their rides to their liking.
Cons of buying a Yamaha RD350 (RD350, RD250 DS7, RD5, models from 1970-1975):1. Maintenance and Servicing: Two-stroke engines require more frequent maintenance than four-stroke engines, including regular oil changes and carburetor tuning.
2. Emissions and Noise Regulations: Older bikes like these may not meet modern emissions standards, which can make registration and insurance more difficult and expensive in some areas.
3. Safety Concerns: Older bikes often lack modern safety features, such as ABS, fuel injection, and advanced suspension systems.
4. Availability of Parts: While there are many aftermarket parts available, original Yamaha parts may be hard to find or expensive.
5. Performance Limitations: Compared to modern bikes, the RD350 series may not offer the same level of performance in terms of acceleration, top speed, and handling.
Ending Conclusion:Buying a Yamaha RD350 (RD350, RD250 DS7, RD5, models from 1970-1975) can be a rewarding experience for those who appreciate vintage motorcycles. The combination of classic design, reliability, and performance can make these bikes a lot of fun to ride. However, potential buyers should be aware of the maintenance requirements, the limitations in terms of safety and performance, and the potential difficulties in registering and insuring the bike in some areas.
Recommendation:If you're interested in buying a Yamaha RD350, it's recommended to do thorough research on the specific model you're interested in. Look into its maintenance requirements, availability of parts, and any potential issues that may arise. If you're planning to use the bike for daily commuting, consider the limitations in terms of safety and performance, and consider whether a modern bike might be a better fit. If you're looking for a vintage bike to collect or customize, the RD350 series can be a great choice. Ultimately, the decision to buy one of these bikes should be based on your personal preferences and needs.
DS7 1972 USA. Fitment shown below. Crank shaft assembly. No modifications.
Crank should be rebuilt with new bearings before use.024 is pretty loose. No cracks or damages, unless noted above. Taken from a complete 1974 RD350. Both rod big end side clearances are around .024 with no up/down play.