GYTR YFZ450 EXHAUST
When the YFZ originally came out way back in 2004, it started a trend of racing ATVs that continues today with the newer YFZ450R. This year, Yamaha reintroduced the carbureted YFZ450 with a few big changes to act as their value-priced 450, but there are also other inherent advantages it possesses over the YFZ450R. Being that it is carbureted and trail-width (46 inches), it is 22 pounds lighter than the fuel-injected R and feels even more so. It’s also a full $1800 cheaper than the R, $1200 less than a Honda 450R and $1000 less than the DS 450.
Installation of the slip-on system is simple: loosen the muffler clamp, pull the two exhaust hanger bolts and slide the stock muffler off. Reinstall the new muffler with the included hardware. Rejetting the carburetor requires removing the float bowl and changing out the stock main jet for one that is not included with the exhaust (you will have to purchase it separately). Jets are cheap, so make sure you get one! Once it’s rejetted, remove the airbox lid and turn the fuel screw out 1.5 turns from closed. This was our best setting for around 2400 feet elevation.
For the YFZ, we wouldn’t spring for a full-exhaust system unless we were building the motor too. The stock head pipe is more than adequate for the airflow the stock motor puts out, and it has a nice-looking heat shield that protects you from pipe burns! To purchase one, contact your local Yamaha dealership or call (800) 962-7926. q