WHICH BIKE MAKES THE MOST LOW-END HORSEPOWER?
FEBRUARY 2013 / MOTOCROSS ACTION 81
We weren’t surprised that the 2013 Honda CRF450 shined in this category, because most of Honda’s 2013 mods—bigger valves and more compression—were designed to improve snap off idle. The Suzuki RM-Z450 engineers also worked hard on their cam to get more low end, and it shows on the graph. Two things did confuse us: (1) The KX450F didn’t do very well at 6000 rpm, yet every test rider loved its low-end thrust. ( 2) We expected more from the Yamaha because it had a brutal, fuel-injection-induced bark that scared most test riders at roll-on. Strangely, the bark is just a momentary hit and not indicative of any serious power.
37. 54 37. 54
When measuring horsepower at 8000 rpm, we were bewildered again. First, we expected the KX450F to romp in the midrange-based on test rider input. Amazingly, it was only third best behind the KTM 450SXF and the Suzuki RM-Z450. Second, we didn’t expect the 2013 KTM 450SXF to be so good so early. On the track, it has a mellow transition from low to mid, but on the dyno, it is 1-1/2 horsepower above any other bike. Third, we weren’t bewildered by the rapid fall-off of the Honda CRF450 powerband. Why not? Because on the track, the CRF450 is all about low-to-mid power, and then goes flat as a board after 8000 rpm.
37. 52 37. 52
CRF450 450SXF KX450F RM-Z450 YZ450F H
WHICH BIKE MAKES THE MOST MIDRANGE HORSEPOWER?
52.07 52.07 52. 43 52. 43
CRF450 450SXF KX450F RM-Z450 YZ450F HO
(Measured at 6000 rpm)