Mode 1 is the base map and provides a smooth, linear throttle response, making the engine’s power much more usable in a wide range of conditions. Mode 2 tones down engine performance – useful when you're feeling tired – while Mode 3 delivers power in a more responsive way, similar to the first mode on the CRF450R.
A new four-valve Unicam head incorporates a new finger rocker design, reducing the engine dimensions and increasing the lift of the inlet valves by 0.5mm to 10mm. The exhaust valve lift is also increased by 0.85mm to 8.8mm.
A better angle
Narrower valve guide angles and two-way valve seat machining smoothens the gas flow to improve downdraft into the inlet ports – it boosts flow from the outlet ports too. Now with a 13.5 compression ratio, the engine develops an 11% increase in peak power; it’ll get you off to a forceful start.