I have a 2006 YFZ 450 50th Anniversary Special Edition and it seems to be running very hot. Even with long pants on my leg starts to get burned after about 30-45 min of riding. I know that my pants are not touching the exhaust because they are tucked away. I have the stock exhaust wrapped and I am running a Dynojet/Moose Racing stage one kit and have the bike jetted properly for elevation. Is there any help/info that anyone can give me?

 

im new to this site but not to the game and im telling you it happens to mine and every one else i speak to with a YFZ. I have a 07 and it was hot while it was stock n just got hotter as i started working on it. i have the burn on my right leg to prove it... Only way i solved this was ridin with boots on at all times....

 

yea its pretty normal with those bikes as for what i know, just make sure your using good oil, a clean airfilter, also make sure theres not like alot of mud or dirt all over the bike around the radiator and fan, some riding pants will really help, they have thick padding that will help with those high engine temps.

 

Have you changed your factory exhaust, either with a slip-on muffler or full exhaust system?The reason that I'm asking is because when I changed mine the factory metal o-ring that seals the headpipe to the muffler slipped out about a 1/4 inch after I installed mine and started leaking at the connection.The spot where it leaked at was right where my leg was and if I was sitting in the staging lanes at the track idling for very long my leg got really hot really fast.

 

a friend of mine has a YFZ and still has the same problem. gets insanely hot.

cool rides there WaaHeHe94.

 

Don't you have a little light that will come on if it overheats? The header pipes getting hot is a known issue. Just follow the advise above, check radiator, jetting. A little heads up, the jet kits recommendations on my quad was lean. I had to bump up. The recommendations are not set in stone. Just a starting point.

 

VERY VERY VERY common problem with yfz's.. i test rode a stock one and found out first hand how hot they get! Solution to this is a full aftermarket exhaust. You'll want to wrap it with the cloth exhaust wrap too. This will help keep the heat in the pipe.

 

Yes, aftermarket helps but it's not a total fix. Design seems to require the pipe be routed in such a way that it sticks out further than required on other quads. which in turn cooks your calf.

 

If worse comes to worse you can wrap it. Just did a set of header on the race car I run and it was night and day as far as the heat in the engine bay.
I have done many turbo pipes with wrap and it really helps to keep the heat in the pipe where it belongs. The only thing that really sucks is the stuff is made out of fiberglass and when you have to tune the engine and check things after every race it can get itchy and scratchy.

I have also went the coatings route. As far as I could tell it did nothing to keep the heat in the pipe. Looked good, but it did not work to keep the heat in the pipe.

 

If you haven't done so already take a ride at night. Take a look at your header after a few minutes of driving, that thing is hot that it glows!!! Known issue, wear protective gear, and check fluids frequently.