Author Topic: Airbox rubbers orientation  (Read 578 times)

Offline Matt_Harrington

  • SOHC Pro
  • Posts: 835
    • View Profile
Airbox rubbers orientation
« on: May 15, 2023, 09:27:09 AM »
Having dismantled the airbox and given everything a good clean, I notice the rubbers (air filter side) as slightly angled. Is there a correct orientation for these? I know I will struggle getting it all together but wanted to check first...
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400

Offline Laverda Dave

  • SOHC Jedi
  • Posts: 2618
  • Health is wealth
    • View Profile
Re: Airbox rubbers orientation
« Reply #1 on: May 15, 2023, 09:38:54 AM »
You should see a small 'bobble' on the flange of the inlet rubber Matt. These line up with the corresponding 'bobble' on the plastic airbox. Get this right and they should align making life simples :)
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Matt_Harrington

  • SOHC Pro
  • Posts: 835
    • View Profile
Re: Airbox rubbers orientation
« Reply #2 on: May 15, 2023, 09:44:06 AM »
I knew there would be an answer! Thanks  :D
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400

Online McCabe-Thiele (Ted)

  • Grogu
  • *
  • Posts: 6381
    • View Profile
Re: Airbox rubbers orientation
« Reply #3 on: May 15, 2023, 09:57:56 AM »
You should see a small 'bobble' on the flange of the inlet rubber Matt. These line up with the corresponding 'bobble' on the plastic airbox. Get this right and they should align making life simples :)

I  agree with Dave - that said it's still a heavy wrestling match to re-assemble - getting all four rubbers to fit - as you will know you get three to fit but a fourth one on 2 or 3 will not as the box distorts.
Honda CB500 K1 (new pit dug out ready)
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Matt_Harrington

  • SOHC Pro
  • Posts: 835
    • View Profile
Re: Airbox rubbers orientation
« Reply #4 on: May 15, 2023, 10:11:14 AM »
Thanks Ted - It's my job for this afternoon! I'll take a chill pill!
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400

Offline Laverdaroo

  • SOHC Jedi
  • Posts: 3458
    • View Profile
Re: Airbox rubbers orientation
« Reply #5 on: May 15, 2023, 11:25:21 AM »
Are'nt they numbered underneath as the only go in one way as per your question? sure they're stamped 1 through 4
Mornings are the invention of the devil!

1977 CB550F (current money pit!!)
2002 VFR800 VTEC (The Beloved)
1977 CB400F (the last money pit!)
1998 Ducati 748\853 conversion(sold :()
1980 ish CB750KZ in a billion bits (need to get rid, anybody want one?))

Online McCabe-Thiele (Ted)

  • Grogu
  • *
  • Posts: 6381
    • View Profile
Re: Airbox rubbers orientation
« Reply #6 on: May 15, 2023, 12:16:00 PM »
Are'nt they numbered underneath as the only go in one way as per your question? sure they're stamped 1 through 4

I think that's the carb to engine side where they are numbered Roo.

The ones into the air box have the wider section at the top with the narrower part at the bottom so they sit horizontal to the carbs.
« Last Edit: May 15, 2023, 12:32:08 PM by McCabe-Thiele (Ted) »
Honda CB500 K1 (new pit dug out ready)
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Matt_Harrington

  • SOHC Pro
  • Posts: 835
    • View Profile
Re: Airbox rubbers orientation
« Reply #7 on: May 15, 2023, 12:25:32 PM »
Defo no numbers and original rubbers have the pip for alignment. The repro rubbers have no pip BUT you can orientate the rubber keeping the flat sides vertical. New ones, which arrived today are nice and soft - unlike the original ones which are as hard as bullets. The originals were all at different angles, so PO / mechanics was unaware they were installed with a correct angle/orientation.

I see the inlet manifold rubbers are for 1&4 or 2&3 - I bet mine are wrong as well!!
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400

Online McCabe-Thiele (Ted)

  • Grogu
  • *
  • Posts: 6381
    • View Profile
Re: Airbox rubbers orientation
« Reply #8 on: May 15, 2023, 12:54:45 PM »
Even if you have long fingers you will find it handy to make a small wooden tool so you can press from the inside of the air box to get all four rubbers in place. When I did my 400 rebuild I fitted it with the rear wheel, mudguard & battery box out it was easy that way.
Honda CB500 K1 (new pit dug out ready)
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Matt_Harrington

  • SOHC Pro
  • Posts: 835
    • View Profile
Re: Airbox rubbers orientation
« Reply #9 on: May 15, 2023, 01:02:11 PM »
Ted, I'll attempt the improvised tool method. I've taken a bike apart before to ensure it all fitted OK but I'm not in the mood to do it this afternoon!  ;D
Matt
___________________________________
CB400F 1976 -  Almost finished
CB400F 1977 - On the road!
Moto Guzzi Le Mans 2 - 1981 (undergoing a spruce up)
CD175 - To be restored
Triumph Speed 400

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal