Husqvarna has unveiled its latest top-spec motocross machines with the all-new FC 250 and 450 aimed to take riders to the front of the pack in motocross competition . Both feature all-new engines and chassis , which give dedicated and competitive motocross riders the machinery to stay ahead of the competition according to Husqvarna . Coupled with class-leading , instantly accessible power , Husqvarna has also got the ergonomics dialled in to provide hard-charging riders with control in every situation . The FC 250 Rockstar Edition features a punchy DOHC engine , delivering power and torque on demand . With a level of performance that Husky says takes it straight to the top of its class , the FC 450 Rockstar Edition is powered by an SOHC unit . Both engines are positioned in their frames for optimal mass-centralisation and better handling . A new , multi-functional map switch allows selection between power delivery modes . It also activates the traction and launch control features , as well as engaging Easy Shift for clutchless upshifts of the revised-ratio fivespeed gearboxes in both the FC 250 Rockstar Edition and FC 450 Rockstar Edition . For 2022 , the FC 250 Rockstar Edition and FC 450 Rockstar Edition come with a completely revised chassis , featuring a new hydro-formed chromium molybdenum frame designed for improved anti-squat behaviour under power . The new die-cast aluminium swingarm provides optimal rigidity with low weight . A durable , aluminium-polyamide hybrid subframe is designed for specifically calculated rigidity . Suspension is supplied by WP . At the front is an XACT 48mm fork with AER technology to provide more progressive damping at the end of the stroke , while the latest XACT rear shock design features tool-free adjustment . Wrapping things up is a set of new bodywork adorned with the latest Rockstar Energy Husqvarna Factory Racing graphics . The new plastics have specifically tailored ergonomics for ease of movement on the motorcycle . Further enhancing their competition-focused build , each Rockstar Edition is equipped with adjustable offset ( 20 or 22mm ), split-clamp Factory triple clamps , Factory DID DirtStar wheels with black anodised , machined hubs , a Factory starting device , floating front rotor with polyamide composite front brake disc guard , and polyamide composite skid plate . The FC 250 Rockstar Edition and FC 450 Rockstar Edition replicate the Rockstar Energy Husqvarna Factory Racing motorcycles competing in AMA Supercross , and place the most competitive machinery in the hands of all motocross racers .