Every year four-stroke dirt bikes are getting faster and faster it seems like there is nothing more they could change. But with all the money for research going into four-strokes and not into two strokes they have developed pretty impressive improvements.
After reading a few articles it seemed like Suzukis main goal for tho year was to improve the feel of riding the bike. To make it not as harsh and heavy as talked about in reviews. They started this out with a big improvement in the chassis, the new frame that Suzuki changed to increased the amount of flex to give the rider a nicer feel on the bike. Another big improvement was in the forks. This year they changed from spring forks to air forks like Yamaha and Kawasaki are now using. It takes a little bit longer to set up the bike to your weight and height standards but after you they say it feels like a whole new bike. These new forks are said to take out almost all the harshness and depending on the situation even take out all the harshness making it almost like riding a RMZ250.
Four strokes have always been known for being hard to start when cold, and even harder after they have been warmed up. So one aspect of the engine Suzuki changed was the kick starter. Some of changes they started off was a longer better angled kick starting lever, a different starting gear ratio, a redesigned de-compressor, a all new revised camshaft exhaust all just to make the RMZ start up easier.
The major change Suzuki made this year was adding a HoleShot Assist Control lever for the starts of your races. When you turn this lever on the bike controls the amount of wheel slip your bike gives, but after 1.2 seconds right around when you would reach third gear it automatically shuts of. This is the first year ever for Suzuki to put this on a production bike!
2015 RMZ450^
seantoor 