If you’re trying to identify or sell a :
: A "great runner" with substantial power for its size. yamaha 5bs 661
The two-stroke community is resilient. As of 2025, small batch manufacturers are beginning to reverse-engineer NOS Yamaha rods using 3D scanning and billet steel. However, for the purist, nothing replaces the factory . If you’re trying to identify or sell a
The 5BS-661 is generally associated with the production era of the 1980s and early 1990s, a period widely considered the "Golden Era" of Japanese outboard manufacturing. During this time, Yamaha moved away from purely mechanical systems and began integrating more reliable CDI (Capacitor Discharge Ignition) systems, making engines like the 5BS-661 highly desirable for their blend of mechanical simplicity and electronic reliability. for the purist