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Will a Yamaha banshee engine fit on 1973 RD 350 frame with out fabrication?

No, a Yamaha Banshee engine will not fit on a 1973 RD 350 frame without fabrication. Here's why:

* Engine Mounting Points: The Banshee and RD 350 engines have different mounting points. The Banshee's engine has a more modern, wider design, while the RD 350's engine is narrower and uses a different style of mounting system.

* Frame Design: The RD 350 frame was designed for the specific dimensions and weight of the RD 350 engine. The Banshee engine is both wider and heavier, requiring significant modifications to the frame to accommodate it.

* Electrical and Cooling System: The Banshee and RD 350 use different electrical systems and cooling systems. The Banshee engine has a more modern, compact system, while the RD 350 uses a more traditional setup.

What You'll Need to Do:

* Custom Frame Modifications: You would need to modify the RD 350 frame significantly to fit the Banshee engine. This could involve cutting, welding, and fabricating new mounting points.

* Engine Modifications: You may need to modify the Banshee engine itself, such as adjusting the exhaust or relocating components to fit within the RD 350 frame.

* Electrical and Cooling System Integration: You'll need to adapt the Banshee's electrical and cooling systems to work with the RD 350 frame.

Alternative Solutions:

* RD 350 Engine Modifications: If you want to keep the original RD 350 frame, consider modifying the RD 350 engine to increase its performance.

* Find a Compatible Frame: There are other Yamaha frames that might be a better fit for a Banshee engine.

Important Note: Before attempting any major engine swap, it's crucial to consult with experienced mechanics and have a detailed understanding of the challenges involved.