Founded in 1981 by Donn Rickard and Jim Dour of Megacycle Cams, California-based R/D Valve Springs has valve spring kits for vintage British, Italian and Japanese motorcycles, and also supplies individual springs and valve guides, valve guide seals, plus shims, lash caps and buckets for overhead cam engines. R/D valve parts are designed, engineered and manufactured in-house using only the best high-quality materials including 6AL4V titanium, 4140 Cr Mo, AL Si bronze and 7075 T06 aluminum. Kits start at $112. Honda CB350 twin beehive kit shown.
