MX bike on the trails??

[bigwake]

ok..so i recently got an 03 yz450f dirtbike..havent ridden it yet because i have to fix it up a little bit first..i have heard contradicting reports about these bikes on the trails..i ride trails in south florida..ive heard several complaints about these 450 4 stroke mx bikes "over heating" on trials..claiming that if you shut it off after riding for about an hour..you'd have to wait 20 mins for it to cool before trying to start it..my bike is all stock..maybe these complaints were off a full modded bike? because i have also heard how nice they are on the trial and ride great?..any help is great! thanx-josh