I bought a set of Boyesen reeds for my 1980 Suzuki RM400 because of their legendary reputation dating clear back to the 1970's. They definitely live up to that reputation. I now have a cleaner, crisper running engine with incredibly smooth throttle response. This results in precise throttle control which allows me to power through the corners like never before. I will never ride a 2 stroke dirt bike without a set of Boyesen reeds!