those GX type engines have to be the mostly widely copied bit of machinery on the planet and each manufacturer does there own thing, 1 collet cup or 2 on others...some engines have soft valve stem seals and others don't so don't take anything gospel what you read. The main thing is the copies now have hardened crank journals and castings that don't weep oil oh did i mention the price of copies, i have just bought 3 new cranks and 3 heads for the same price as 1 Honda crank.Wait there are ment to be two? I only saw one on. The exploded view I saw?