www.zxrworld.co.uk

Just wondered if any other ZXR owners have used this? We used it in 2 ZXR400 race bikes last year and both dropped a valve a meeting apart!!! Could be coincidence, however it may also be that it runs a little too hot for the standard valves. Bloody expensive too!!!

should run colder being a higher octane, did you cahnge the jetting to slightley larger to suite? sounds bloody expensive if you need a new top end to run it hahaha