How often should you adjust sport bike valves?

Answer 1

Sport bike valves will AT SOME POINT IN THE LIFE OF THE BIKE, tighten up or loosen. In the case of Japanese production bikes, valves are made to sustain high rpm's for extended periods of time. A quick story. My latest and greatest of all my bikes is my 07' zx10r. I'm from Cali and have 28k on her, brought brand new. I broke her in well and ride her hard. Not a track bike. Which means never max rpms for an 30 minutes to an hour (which they are made to do on the track). My valves were within spec at 16k. Dont think because you ride soft or hard you dont need to check them. Im checking mine again at 28k. A personal friend of mine had 94k miles on his 04' zx10r (went through two clutches ...) If you want that bike to not only last but BEHAVE like it should, check those valves.

Whether you ping off the limiter or just 'street ride hard'. Check those valves