The 2020 Husqvarna FC450 has minimal changes to it from the 2019 FC450 and 2019.5 Rockstar Edition, so we took what we have learned with those bikes and tinkered with the 2020 version in order to get you the best baseline setting we could for a wide range of riders. After numerous hours and tests later we have come up with these suggestions as the best baseline setting so you can just go out and ride.
Suspension: The factory fork and shock settings are much softer on the 2020 FC450 so we did go a little bit stiffer on air pressure and softer on compression settings, but have found improved results in comfort, not just performance. All three test riders (155, 170, 195 pounds) that tried this setting agreed that the bike/chassis was calmer on acceleration and de-cel bumps. This setting will give the Husqvarna better hold up as well as help the front end from feeling stinkbug coming into corners. This setting was also well perceived on the 2019.5 Rockstar Edition as well. Our 195 pound rider preferred a 48N/m shock spring with the recommended shock settings below.
Air Pressure: 10.9 bar
Compression: 14-15 out
Rebound: 11 out
Fork Height: 5mm
L/S Compression: 11-12 clicks out
H/S Compression: 1-3/4 turns out
Rebound: 12 clicks out
Shock: (195 pounds and over)
Spring Rate: 48N/m
L/S Compression: 14 clicks out
H/S Compression: 2 turns out
Rebound: 13 clicks out
Rider Triangle: The standard Pro Taper handlebar that comes on the FC450 is low and flat, but fits the Husqvarna’s cockpit very well for most. I did want more height from my bar when I stood up, so I went with a Pro Taper Fuzion SX Race bend and this helped me get over the front of the bike more when standing. The SX Race bar worked well for riders from 5’8 to 6’1. The SX Race bend comes in a crossbar or crossbar-less style and is 800mm width, 87mm height, 54.5 rise, and 54mm sweep. If you’re looking for a better stand up feel from your Husqvarna look for handlebar close to this measurement. If you do like the stock bar try cutting the bar down to 803mm instead of the longer/standard 811mm. This will help you corner.
ECU Settings: The 2020 FC450 has a much better map 2 ECU setting and doesn't need a re-flash like the 2019 or 2019.5 Husqvarna did. Map 2 is my preferred standard map in most conditions as it comes on a little sooner and pulls slightly harder than map 1. However, if you want to get more power, I recently tested a Vortex ignition mapped by Chad at XPR Motorsports on the 2020 FC450 with great results. If you’re looking for increased bottom to mid range while keeping that smooth/linear engine character Chad over at XPR has a couple maps that you could really benefit from. If you already have a Vortex you can simply send Chad your ECU and he can send you a “Keefer” map that we have tested on the 2020 FC450. A Vortex ignition isn't needed in all bikes but he Husqvarna really benefits from this modification.
Gearing: The 2020 FC450 comes with a 13/49 gearing ratio. This gearing should be just fine for most tracks, but if you want a little more mid range engine recovery and free-er feeling shock on acceleration, a 14/52 gearing ratio works well. The 14/52 gearing will require a new chain length and I usually go with this gearing when riding tracks similar to Glen Helen (aka faster choppy tracks) to settle the rear end under load.
Chassis: Aftermarket engine mounts are all the rage right now and some of you may not have the money to spend on a pair of engine mounts for your Husqvarna. I will say that I don’t feel like the Husqvarna’s chassis is stiff, but I have heard from other lighter riders that it can be at times, so I decided to play around with torque specs on the engine mounts and stumbled across this. If you’re experiencing a stiff feeling chassis sensation and want the Husqvarna to settle while leaning (under throttle), there is an inexpensive way to achieve some extra front end traction. You can remove the left side upper engine mount bolt (upper right bolt only, as shown) and torque all other top engine mount bolts to 30Nm. This band aid will give you a more planted sensation when on throttle while leaning the FC450 through sweepers and fast straights. You will have to make sure that all engine mount bolts have blue Loctite to ensure they do not back out. You can also try torquing your swingarm pivot bolt to 95 Nm (instead of 100Nm) to help rear end traction out of corners. The downside to doing these mods is that the chassis will flex a little more, so if you’re riding deep tilled tracks this modification may be too “flexy” for some (especially when chopping throttle).
Rear Axle Block Kit: Going to a Works Connection axle block kit or Ride Engineering axle block kit will get rid of the fixed left axle block on the stock Husqvarna’s axle. This will help the rear end to move more freely under throttle and improve the shock’s comfort on acceleration chop. Rear wheel placement isn’t as crucial on the Husqvarna as it is on some other 450’s we have tested so if your rear wheel placement is somewhere in the middle of the axle block marks, that will be sufficient for these recommended suspension settings.
Airbox/Side Panel Modification: If you’re a 2019 or 2019.5 Husqvarna owner do yourself a favor and get the 2020 left side airbag cover as that will get you snappier throttle response at low rpm’s.