SOHC.co.uk Forums > CB350/400

Hendler Air Filters, will these fit?

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Laverda Dave:
When you look at the design of the air box and plenum chamber it is a complicated moulding and that obviously was expensive to produce. I'm sure if Honda could have got away with fitting pods to save money over the many 000’s of 400/4’s produced they would have done but obviously they were limited by emissions and importantly by the look of the bike.
My view is if Honda spent a small fortune in developing the filter system that's obviously what will work best.
If I was racing a 400/4 then yes, I'd fit pods for more air flow but that's only beneficial at higher revs, for normal everyday stop/start riding I would stick with what Honda designed.

Athame57:

--- Quote from: Laverda Dave on June 24, 2025, 09:37:53 AM ---, for normal everyday stop/start riding I would stick with what Honda designed.

--- End quote ---
Living in London I think I had better stick with the status quo then.  :(  Thanks for this Dave.  ;)

TrickyMicky:
Don't forget also,  the airbox also serves as an air silencer.  Way back in the late 60's,  I bought a second hand CB250, the first of the 5 speed models. Itv ran like a stuffed pig, and Read Titan in Leytonstone were selling the latest "must haves", which was a pair of Amal Concentrics, fitting kit, and a pair of bell mouths. After spending a lot of time and dosh fitting different jets, I finally got it running reasonably well, BUT!!!, once it went over 7,000 RPM, the noise was more suited to the Cronk y Voddy Straight than the A12. 
  Great fun for a tear-arse in his twenties, but I got a few tugs and lectures from the local constabulary.  Just as an aside, it had a TLS front brake with an oval drum, and if I ran it at high revs for too long it demonstrated quite clearly that the casting on top of the gearbox was porous. This was atn the time when BSA/Triumph had displayed the new 350 Bandit/Fury models. I was about to change hats, but they never went into production, so in 1971 I purchased a brand new CB250, Oh what a revelation, superb bike. Have stuck with Hondas ever since.

exvalvesetdabbler:
I had the carbs on/off about 4 times one day trying to sort out an over fueling issue and just ran out of swear words. Ended up buying some pattern air box to carb rubbers from DSS and they were a lot softer than the old ones.

I find it easier to get the outside ones on first and then use a lump of wood to push the middle ones in by pushing through the air box onto the back of the rubbers.


Regards
Dave

McCabe-Thiele (Ted):
The last two posts on this thread ring so many bells in my head full of partly forgotten memories.

The first one was the sheer noise on acceleration in a Mini with twin bell mouthed SU's with a bit of a grill on them to keep out rocks. At 60 mph the noise in the cab made the radio at full volume inaudible. 

My move from a Triumph 21 to a used 1964 IIRC Honda 250 Dream, a bike that never dripped oil or broke down plus of course the novelty of electric start. I never bought a British bike again despite the fact that they eventually improved.

Finally the struggle when I first stripped down the 400/4 carbs to do a first fire up after 12 or so years of standing. Stripping the carbs was easy compared with the effort needed to re-fit that air box chamber betwen frame and carbs, I can still remember my T shirt being wringing wet with sweat.

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