I bought my '09 450f last year off a guy who raced VET A. Despite his racing skills he lacked maintenance wise because when buying the bike I saw he neglected it (filthy air filter and oil was filthy as well) among other things. He said he had a new top end installed with only 8 hours on it but I was still able to negotiate the price way down because of lack of maintenance. My question is though should I just do a complete rebuild for peace of mind? I've only put another 20 hours on it, I just wonder if it's really more hours on it than what he says and with the way it was maintained would I just be better off buying like a Wiseco Complete Top and Bottom Kit and Cam Chain for 600$ online and having my mechanic do it? (I'm def not doing it myself) I know Yammys' are bulletproof but I just constantly worry about grenading and whether or not he was honest about the hours.