Working on a classic Yamaha RD250 or RD350 from 1973 to 1979? This complete engine simmering set is exactly what you need for a rebuild or reseal. It's brand new and includes all the crucial seals and gaskets to stop oil leaks and keep your engine running tight. The kit is made by Sevenmoto (SM) and matches OEM reference 1A2 522 521. It covers multiple positions: front, rear, top, bottom, left, and right—basically everywhere you need a seal on the crankshaft and related engine parts. This includes housing seals, crankshaft seals, shaft seals, and oil seals. If you're tearing down an RD engine, replacing worn-out seals is a must-do to prevent future leaks and maintain proper compression. The kit is comprehensive, so you won't have to hunt for individual seals. Perfect for restorers, mechanics, or riders who want to keep their vintage two-stroke running strong. Installation requires some mechanical know-how, but if you're already inside the engine, this set makes the job smoother. Using quality seals like these ensures your RD will be reliable for years and miles to come. Don't let old, brittle seals ruin a great rebuild—start fresh with this complete simmering set. Your bike (and your garage floor) will thank you.