Honda CB 400 Air box

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Settled in member
Posts: 4
Joined: Tue Feb 19, 2019 5:30 am
Bike owned: CB400 NC31 1999 Hyper Vtec
Honda CB 400 Air box

Post by HyperVtec » Wed Feb 20, 2019 5:24 am

Hi there guys over the years i have managed to keep the airbox in relativly good condition seeing as I am not able to open it or remove the air filter due to the Air box being brocken however I have pushed it far along and it badly needs replacing now, Buying a new airbox is not an option as they are not avalable.

I would like to switch to a high flow air filter or cone filters against my better judgment as this is my only options.

I understand that I will need to increase the jet sizes and or air fuel mixture screws along with the air cone filter due to there being a larger air intake volume however I am not exatly sure what parts I will need ( Injectors?)

Please help As it is now getting hectic.And very important that i replace this the bike is not getting enough air flow and its messing around with everything


Familiar Member
Posts: 253
Joined: Sun Mar 08, 2009 8:52 pm
Bike owned: 1CB400 SF 1 VFR800 1 Moto Guzz
Location: Prudhoe Northumberland
Re: Honda CB 400 Air box

Post by Superjack44 » Wed Feb 20, 2019 9:02 pm

Exactly what model is it, you can find airbox's on fleabay Doh should have read your profile first

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