With a focus on the GNCC Racing series, KTM has a six-model cross-country lineup of off-road racing motorcycles. There are three-each of two-strokes and four-strokes, including the new 2021 KTM 125 XC two-stroke racer. All six dirt bikes share the same chassis, so let’s take a look at the common (and model-specific) upgrades for 2021.
Updated WP Xact fork. The latest version of the WP Xact fork gets new internals that have larger oil and air bypasses. The goal is to reduce pressure peaks for smoother action. Additionally, there’s a new mid-valve damping system, further improving feel. The fork also has a smaller rebound spacer to increase air volume, resulting in more-consistent air-spring action.
New link-piston O-ring for the WP Xact shock. KTM says this mod will keep shock action more consistent over long races.
New linkage-bearing seals. For smoother rear suspension action, the SKF bearing seals are less restrictive than the earlier version.
Suspension settings updated. To match the mods to the fork, shock, and linkage, the suspension settings are adjusted accordingly.
450 XC-F motor updates. The SOHC engine has a new connection rod for faster revving, new engine mapping with a focus on low-end power, a more durable shift locker, and a more robust hour meter casing with a new mounting.
New throttle assembly for XC two-strokes. Using roller actuation, the throttle action will be smoother and extend the life of the throttle cable.
The 2021 KTM 125 XC is a modified 125 SX. Although a new model, the 125 XC is basically the 125 SX with electric start, a sidestand, and a larger translucent fuel tank.