No, membership in outlaw motorcycle clubs (OMCs) such as the Hells Angels, Bandidos, Outlaws, and others is not exclusive to riders of Harley-Davidson motorcycles. These clubs do not discriminate based on the brand of motorcycle a rider owns or rides. OMCs generally focus on a shared interest in motorcycle culture, camaraderie, and a specific lifestyle rather than the specific brand of motorcycle.
Members of these clubs can ride motorcycles from various manufacturers, including Yamaha, Kawasaki, Honda, and others. The brand of motorcycle a rider chooses to ride does not typically play a significant role in determining eligibility for membership in an OMC. Instead, membership is typically based on personal connections, compatibility with the club's values and requirements, and the initiation process set by the specific club.
It's important to note that OMCs operate outside the boundaries of the law, and their activities can involve criminal elements. Joining or associating with these clubs is a personal choice and should be approached with caution and a thorough understanding of the potential legal and social implications.