1978 CB550 FOUR AIR BOX CONFUSION

[Brian Cairns]

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Hi sorry for the hassle but I have confused myself.
I have attached a diagram of air box which I have numbered 1 to 4 in red .
I have a few questions, if I may:
Number 1 ( part 23) . Where does this go to? Can I block this port off ( see number 2)
Number 2 ( part 22) . I think this id the breather for the Crankcase and should be attached to crank case? However I am thinking of doing away with this, allowing crancase breather tube to hang loose and blocking port on airbox.
Number 3: ( part 17) does this tube hang loose from port on part 12?
Number 4 : which bolt goes here? i.e 15,14,3 etc

Apologise for my lack of knowledge !

Thanks in advance
Brian

[Bryanj]

The bolt is part 29 with the nut 15 inside the airbox, at the top 29 and 14.
Part 17 goes to the outlet you marked as 3 and just dangles, it should have a closedish end with a split so you can squeeze it and drain moisture.
Breather goes from top of ending to one of the bottom connections but cant remember which or ehere the other goes.
Yes you can blank the holes, remove the gubbins from inside and use a 500 air filter

[deltarider]

[...]
Yes you can blank the holes, remove the gubbins from inside and use a 500 air filter

Excellent advice.

[Brian Cairns]

The bolt is part 29 with the nut 15 inside the airbox, at the top 29 and 14.
Part 17 goes to the outlet you marked as 3 and just dangles, it should have a closedish end with a split so you can squeeze it and drain moisture.
Breather goes from top of ending to one of the bottom connections but cant remember which or ehere the other goes.
Yes you can blank the holes, remove the gubbins from inside and use a 500 air filter

Hi Bryan,
I think I have eventually taken you advice ( I think you advised this in a previous post)
Just looking a little more advice if you don't mind?
1. Block off ports as circled in yellow?
2. remove gubbins from inside ( marked in yellow )
3. Insert cb 500 air filter.
Is there anymore adjustments to do?
Have you got a year or part number for the air filter? I don't want to buy the wrong one?
Also I have the original PD46C carb.......fully cleaned and set up with original jet sizes ( main 90, slow idle 42). Do you have to make any changes to carb?
Sorry for all the questions...I am new to trying to sort out my own mechanics etc
Cheers
Brian
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[DomP]

I can't really add much to this except that I have used a 500 airfilter on my 550 as suggested by Bryan and Ken because I was missing g so many of the original parts.  I'm still missing the F model airbox lid but I'm going to make a fibreglass one to fit under my modified seat pan.

I think you'll need to blank off the 'collector box' hose too won't you?

[Brian Cairns]

I can't really add much to this except that I have used a 500 airfilter on my 550 as suggested by Bryan and Ken because I was missing g so many of the original parts.  I'm still missing the F model airbox lid but I'm going to make a fibreglass one to fit under my modified seat pan.

I think you'll need to blank off the 'collector box' hose too won't you?

Hi is that the port on part 12? To be honest I am not sure.
Out of interest , how did you blank of the hose ports etx

Brian

[DomP]

Well the truth is I've not yet as I'm still rebuilding the engine but probably wind an appropriate sized bolt in.

[Johnny4428]

Or.
https://www.ebay.co.uk/itm/264760524869?var=564585732561&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338365712&toolid=20006&customid=EB186627424&

[DomP]

That's a tidy solution

[ST1100]

Or.
https://www.ebay.co.uk/itm/264760524869?var=564585732561&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338365712&toolid=20006&customid=EB186627424&

That's a brilliant find, for so many purposes! Thanx 

[Brian Cairns]

Or.
https://www.ebay.co.uk/itm/264760524869?var=564585732561&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338365712&toolid=20006&customid=EB186627424&

great thanks

[Bryanj]

I wouldnt blank the hose from the plenum as the 500 wasnt.

[DomP]

I wouldnt blank the hose from the plenum as the 500 wasnt.

Does that hose not just draw in unfiltered air then Bryan?

[deltarider]

No, at one end (in the thicker part) of the TUBE ASSY., BREATHER there's supposed to sit a little foam in there.

[Brian Cairns]

Thanks so much all.....fantastic forum with everyone so helpful.


Thanks all

Brian