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SOHC.co.uk Forums => CB500/550 => Topic started by: bobv7 on February 03, 2020, 01:24:08 PM

Title: Refitting Cb500 four carbs
Post by: bobv7 on February 03, 2020, 01:24:08 PM
Hi

I've taken mine off to get them sorted but getting them off and out was quite a struggle. What methods do the learned members suggest as the best way to refit them?

Cheers, Bob
Title: Re: Refitting Cb500 four carbs
Post by: Johnwebley on February 03, 2020, 01:52:30 PM
Loosen the  airbox.
Use a heat gun to soften the rubbers

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Title: Re: Refitting Cb500 four carbs
Post by: Bryanj on February 03, 2020, 02:22:37 PM
Btute foce and swearing a lot plus new rubbers to cylinder head
Title: Re: Refitting Cb500 four carbs
Post by: Nurse Julie on February 03, 2020, 02:29:20 PM
A pot of red rubber grease helps no end. Plus the hairdryer or a pan of boiling water to soften the rubbers.
Title: Re: Refitting Cb500 four carbs
Post by: GTB981 on February 03, 2020, 02:49:24 PM
I`ve had the carbs off my 550 3 times in as many weeks now (long story). I have found you can get the outer airbox rubbers out from the bike after releasing the clamps. The 2 inner ones I pop into the airbox. Keep clutch cable clear and the carbs slide in and out from rhs. The rubbers on my bike are new and I also use red rubber grease. I perfected this method after many a grazed knuckle.
Title: Re: Refitting Cb500 four carbs
Post by: Trigger on February 03, 2020, 03:13:06 PM
I`ve had the carbs off my 550 3 times in as many weeks now (long story). I have found you can get the outer airbox rubbers out from the bike after releasing the clamps. The 2 inner ones I pop into the airbox. Keep clutch cable clear and the carbs slide in and out from rhs. The rubbers on my bike are new and I also use red rubber grease. I perfected this method after many a grazed knuckle.

Very hard to re glue the 2 inner ones once you have retrieved them from the air box  ;)
Title: Re: Refitting Cb500 four carbs
Post by: bobv7 on February 03, 2020, 05:24:19 PM
Many thanks, they were a right bugger to get out.......and I've ordered some red rubber grease. Don't tell the wife! ;)
Title: Re: Refitting Cb500 four carbs
Post by: GTB981 on February 04, 2020, 07:03:25 AM
Re-glue ? Are they meant to be glued in ???
Title: Re: Refitting Cb500 four carbs
Post by: Trigger on February 04, 2020, 07:34:38 AM
Re-glue ? Are they meant to be glued in ???

If you get a old set of rubbers and look in the groove, you will see the remains of a brown adhesive. It is also on the chamber to airbox rubber  ;)


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Title: Re: Refitting Cb500 four carbs
Post by: GTB981 on February 04, 2020, 07:36:19 AM
Cheers for that. Kind of makes my method a tad impractical.
Title: Re: Refitting Cb500 four carbs
Post by: deltarider on February 04, 2020, 08:07:55 AM
Are you sure it's glue? I always thought it was either vaseline or some sort of silicone paste. I see no harm NOT to glue them.
Title: Re: Refitting Cb500 four carbs
Post by: bobv7 on February 04, 2020, 09:04:50 AM
Mine aren't stuck and I noticed that the 2 outer ones have a pip on the edge and there is a similar one on the airbox. I assume that they are supposed to line up?
Title: Re: Refitting Cb500 four carbs
Post by: Johnwebley on February 04, 2020, 09:43:36 AM
Mine aren't stuck and I noticed that the 2 outer ones have a pip on the edge and there is a similar one on the airbox. I assume that they are supposed to line up?
The 2 outer ones are handed.

Align the dots

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Title: Re: Refitting Cb500 four carbs
Post by: bobv7 on February 04, 2020, 10:59:41 AM
Thanks for the confirmation :)
Title: Re: Refitting Cb500 four carbs
Post by: Nurse Julie on February 04, 2020, 11:54:10 AM
+1 with Oddjob, defo a stringy mastic / glue type substance. Removing the adhesive is one of the jobs that Trig gives me to do 🙄🙄🙄🙄 What a lucky girl I am 😁😁😁😁
Title: Re: Refitting Cb500 four carbs
Post by: Oggie400F on February 04, 2020, 12:53:23 PM
So if you have removed the Airbox rubbers to soften in wintergreen solution, what glue is best to refit them? 🤔
Title: Re: Refitting Cb500 four carbs
Post by: Johnwebley on February 04, 2020, 01:04:53 PM
If they are still flexible. I wouldn't bother.
I never have

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Title: Re: Refitting Cb500 four carbs
Post by: bobv7 on February 05, 2020, 12:13:06 AM
As its not exactly a closed system surely any effect on carburation caused by the inlet stubs not being glued in would be insignificant? :o
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