The KLX450R features the same aluminum perimeter frame, same engine bay and powertrain parts, similar suspension and a wider ratio transmission that enhances its off-road capability. It is also fitted with an electric start system that revs up instantly every time you press the handlebar-mounted start button. The engine is supposedly obtained from the viciously powerful KX450F. If you want to know how it works for off-road use, the engine has been improved to stress low and mid-range power and torque with reworked cam lift and timing and flywheel mass that has been doubled in comparison to the motorcrosser.
Modifications to the engine are instituted in the head where intake and exhaust parts (valve diameter) have been decreased one millimeter and these valves have been transferred to stell from titanium in the bike. The steel exhaust valves are more durable than titanium valves. The clutch cable has been re-routed to reduce effort and improve feel.
Other revisions include a larger 1.2 gallon fuel tank, wider but softer seats, LED headlights and taillights, spark arrestor, O-ring chain, side stand and 18-inch rear wheel. A lightweight digital instrumentation package includes a speedometer, odometer, and clock and twin trip meters. The KLX450R has spring rates and right-on characteristics that are suited for off-road use.
Owners of this motocrosser will be pleased and gunning its start-up engine never seems to be a hassle. Like any four-stroke off-roader, it does take a bit for a cold engine to churn up but then again, the thrilling ride of a lifetime starts now.