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I have come to find out that Honda didn’t allocate enough 2021 Honda CRF450R’s to dealerships, so if you’re lucky enough to be able to get your hands on one, you may be looking for a couple fixes and a baseline settings for your new red ride! Have no fear as I have been spending some quality time on the 2021 Honda CRF450R and have come up with a couple fixes as well as a setting that may work for a broad range of riders. Below are a couple mods that you can do for a relatively low cost and get a dramatic change in the way your 2021 CRF450R rides.
ECU Setting:
Honda doesn’t exactly want you to change their ECU settings, but in the 2021’s case, we have no choice but to try and get some better maps as the standard 1&2 maps are very rich/dirty feeling on low RPM situations. Honda doesn’t “really” have an ECU tool for the consumer to make custom maps, so we have to leave it up to only a chosen few techs that have the Honda’s programmer. Even when a tech has a Honda programmer, map 1 is locked, so only map 2 and 3 are available to change. I have talked to a few 21’ CRF450R owners that DO NOT feel the rich/dirty feeling, but if you find it bothersome, I have tested some new maps with Jamie from Twisted Development that will help. You can send your stock ECU into Twisted Development for a re-flash that will change your map 2 & 3 settings. With the Twisted re-flash, map 2 now has better pulling power than the standard map two, but still feels long and linear like map 1. Connection is better to the rear wheel now that map two is cleaned up so slow RPM cornering is much cleaner. Acceleration out of corners provides more forward rear wheel bite and helps second gear roll on delivery. The Twisted #3 map has more bottom end snap and pulls harder out of corners, which is great for softer conditions. This map is great for you eat coast soft/loamy riders, but still fairly manageable when the track gets rough. With the Twisted re-flash the 3rd map gives you more bottom mid range with a little less over-rev, so this map is a great third gear roll on map for lazier riders. The Twisted re-flash will set you back $200.00 and is well worth the money considering how bad the standard mapping is on the 2021 Honda CRF450R. www.td-racing.com or 951-698-7222
Optional Suspension Setting:
The stock suspension might be too soft for you if you’re anywhere over 180 pounds. Honda has a 5.0 N/m fork spring that is adequate for most, but the valving seems too soft. Out back the 54 N/m shock spring is also way too soft, so if you’re looking for a quick band aid to make your Honda CRF450R better, without going to a re-valve, going a spring rate up on each end has helped me feel more secure on high speed tracks, as well as soft bumpy tracks. Bringing both ends up a little in the stroke (with the heavier spring rates) has given me more front/rear wheel traction as well a Honda that corners better without over-steering. Unlike the 2020 Honda CRF450R going up a spring rate on the 2021 version has given the new red bike more track toughness. If you’re not into spending more money on a re-valve at this time, simply get some heavier springs and try this setting:
Fork:
Spring Rate: 5.1 N/m
Height: 2mm
Comp: 11-12 out
Rebound: 11 out
Shock:
Spring Rate: 56 N/m
L/S Comp: 12 clicks out
H/S Comp: 2 3/4 clicks out
Rebound: 10 clicks out
Sag: 106mm
Test Muffler Shown. Not production model.
FMF 4.1 Muffler System:
Putting an aftermarket muffler system on isn’t necessarily about more horsepower, but about changing the character of the engine in a way that the Honda needs. I went out and tested three different versions of what FMF is about to offer the consumer and the one I chose looks to be the one that will go into production. So what does the 4.1 system do? What I liked about the 4.1 system right off the bat is that it calmed down the vibration feel that I get on the Honda. For whatever reason bolting on the 4.1 helped the harmonic vibration that I get when hitting higher RPM’s from the stock muffler. This actually gave the Honda more comfort, because it felt less rigid! The 4.1 also made the engine character broader with better low end RPM response, but with a smoother roll on. Mid range is increased as well as slightly more top end/over-rev in 2nd/3rd gears. After going through three different versions of pre-production FMF systems and several headpipe/muffler combinations I was pleased with what we left the track with. I was so pleased that I kept my favorite FMF combination on my test machine.
