Hi guys , just reading your posts regarding the 175/200 center pin breakage and have a question
What material are you upgrading to when you replace the stock cente pin ?
I do undestand and support what karl indicates regarding the hormonics above 10,000rpm. Yes a 4 bearing crank would elevate a lot of the issues, i also think a professional balancing done would truly help as well.
A good friend of mine purchased a factory TD3 crank from Japan he took his pistons/rings new crank etc iand had tested for balance and it was realy out of balance. He was not impressed.