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If you want to get rid of that plastic air filter cage system that sometimes doesn’t seal all that well on the 2023 YZ450F, go with the Twin Air Power Flow Filter Kit. To me the Twin Air YZ450F PowerFlow kit is the best all-around filter system for the YZ450F airbox. Why? With this kit, Twin Air replaces the stock air filter cage with an anodized aluminum cage, gets rid of the backfire screen for uninterrupted airflow and adds a small aluminum support bracket to hold the filter/cage in place. This ensures a more secure fit and doesn’t allow the filter/cage to float as much as the stock rubber strap piece that attaches to the filter/cage. The rubber strap is still utilized but the added security of that small bracket ensures that the filter cage doesn’t move or break the seal of the filter when accelerating. When accelerating the air volume/force that the 2023 YZ450F creates can possibly move the filter slightly and can break the filter’s seal around the lip.
This Twin Air design brings in more air via no restrictions caused by the backfire screen, better sealing around the edges and better throttle response/bottom end pulling power. Yes, that is right, you will notice more rpm response out of corners as well as better pulling power out of soft loamy berms. With the Twin Air Power Flow Kit along with some mapping, the 2023 YZ450F becomes a snappy, yet connected blue machine that gives the rider tons of rear wheel traction and enough excitement on low rpm that is helpful to get in and out of soft spots on the track.
The downside is that some dirt particles are still prone to fall into your air boot if you’re not careful with removing the dirty filter. The reason why it’s sucbseptble to dirt particles is because Twin Air doesn’t incorporate the backfire screen and unless you have a super steady hand, a few pieces of dirt can get down inside your air boot. Having the backfire screen on/in stock form isn’t going to help much if some of the dirt is near the edges of your cage/filter but having an open mouth cage is FOR SURE not going to save you if dirt gets though the filter so be sure to oil your filter properly.
If you do find yourself in that situation simply get a shop vac (with a skinny end/attachment) and suck out any particles that have found its way inside the air boot. If you DO NOT open/twist your throttle after the particles have found its way inside the air boot, you will get nothing past the throttle body and you’re engine will not get any dirt inside of it. The Twin Air Power Flow Kit takes a little more patience when changing filters, but can add power to your YZ450F as well as create a better sealing surface. You can also do what I do and simply lean the bike over on a stand then take your filter off and that will prevent any dirt getting too far into the air boot itself. BOOM!
The Twin Air Power Flow Kit (with Power Flow filter) should be arriving to RMATVMC shortly and will cost 250 bucks! If you can’t wait, you can order right here: https://www.dominuscorp.com/amfinder/?cat=184&find=yamaha-yz-450f-2023-16848265
