I was trying to find a +9.21oz GYTR flywheel (on backorder everywhere) when a fellow TTer PMed and said he had one for sale that he had bought, but never installed, because he had sold his YZ. I specifically checked with him to ask if the one he had was the heaviest one ( adds 9.21oz) which is part# GYT-2S297-50-50. He confirm that it was, so I bought it from him. Well, I got it in today and noticed that the install instructions which came with it are for the GYT-2S297-50-00, which is the lighter (+4.8oz) version. Now I'm confused, maybe disappointed. The part itself is stamped F2S210 and weighs in at 23.2 ounces (658 grams). Does anyone know what a stock flywheel weighs or have one lying around (after you upgraded) that you could weigh and let me know for comparison purposes? If a stock one is 14 ounces, I'm good to go. If it's 18.4 ounces stock, I got sent the lighter one. Thanks!