2009 Yamaha YZ250F Preview

Introduction

2009 Yamaha YZ250F

2009 is a very important model year for the Yamaha YZ250F as the bike wasn’t just a little bit refreshed, but has been added to it a host of improvements that play a very important role in track performance and ease of riding.

The chassis was lightened and rebalanced so that it would prove efficient for different categories of riders, but while they would feel at home on it, a retuned engine will be providing all of the power and torque needed in order for this baby to become a blast in any motocross competition. It is the result of a 60 mm lengthened header made of titanium and a 50 mm shortened aluminum header. These two modifications combine and offer great low-end throttle response, as well as loads of torque to back it up. But they required another approach towards the carburetor jetting and CDI ignition, something that ended up in an even more powerful engine.

A new mechanical feature is the clutch. This unit is now fitted with a floating rubber dumper (not a coil spring) and it performs faster and more precisely, perfect for closed course competitions. Clutch lever was shortened.

Having also fitted the powerplant with a new lubrication system that provides better unction and a longer life for the liquid-cooled 250cc, DOHC engine with five titanium valves (Yamaha’s signature), the maker could now take its time and think about how all that power will be properly put down the track. The answer came with mass centralization and the ProTaper aluminum handlebars. Set the bike up a pair of Excel rims and you’re all sorted out from many points of view.

Among the sharpest handling bikes in the class due to the aluminum tuned-flex frame, the revised Yamaha required a grip seat that would keep the rider in place during exploitation. It got it, so bikers will be going around the corner well planted into the seat (that’s when they actually use the seat during races).

History

2001 Yamaha YZ250F

Taking a look at the advancement levels that the bike has reached you would think that it comes a long way back, but that would mean confusing it with the YZ250 two-stroke motorcycle.

Actually, the Yamaha YZ250F was first introduced in 2001 and it was created from the need of a powerful (34 HP) four-stroke motorcycle, preferably powered by a quarter-liter engine, that would prove extremely valuable on a package that could have easily been confused with the one of a 125cc two-stroke thumper.

Ever since it was introduced, the bike was powered by the 250cc single-cylinder, water-cooled, four-stroke, DOHC motor which would have been fitted on a bulky steel frame. This last unit was replaced in 2006 with a frame that was entirely made of aluminum.

2009 is the next big year for it so you will be receiving good feedback on this model.

 1  2 3

Next page