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  1. Engine
    Man, iv been relentless asking questions lately. But I’m not real familiar with the trx450. This is my first time owning one. It has a Athena 500 big bore. Do I need to run aftermarket valves and valve springs for a stage 2 hot cam
  2. Engine
    My exhaust valve stem measurements are barely in spec, but not at the service limit. I was wondering if I should replace them or just run them for another season. Exhaust valve stem spec: mm(in) 4.965-4.980(0.1955-0.1961) Service limit: 4.96 Current specs: Left exhaust: 4.966 Right exhaust...
1-2 of 2 Results