I am buying a 310 ESR cylinder kit for TT. I am getting the 86' style with the open exhaust window and was wondering if any one has had problems with that causing bad ring or piston life? I have an 88' so I don't know. Is the 310 a well running motor? Also I have a bad knocking in my lower end so I am buying a new honda crank and counterbalancer and putting new bearings in everything, will this fix it or not? Also how often should the bearings on the crank and stuff be replaced, I race every weekend.
Thanks Joe

 

ESR makes EXCELLENT products.
If I'm not mistaken, you mean the INTAKE does not have a bridge.
All of the exhaust ports are bridged to my knowledge.