Topic: why are my '72 cb750 emulsion tubes sticking out?

[Hondawggie]

I didn't notice it when I disassembled my '72 cb750 carbs to clean them but my 4 emulsion tubes don't screw in as deep as I'd like.  This is the 2nd set of cb750 carbs I've cleaned, the first set was from my 1971 cb750 and I don't remember this coming up on that bike.

So I thought it was a burr or something in the #1 carb's emulsion tube 'tunnel' but I checked all of them -- they all thread in *exactly* the same depth and leave threads exposed, and I see no bad threads on any of the 4 emulsion tubes nor on their threaded shaft's threads.

Is this normal or what

[Magpie]

Looks like the set I assembled last week. I don't think they bottom out into the carb. Cliff.

[Rookster]

Its completely normal.


Scott

[Hondawggie]

Looks like the set I assembled last week. I don't think they bottom out into the carb. Cliff.

Thanks Cliff, I looked carefully at the threads on the emulsion tube before putting it in the carb and there is a distinct 'color line' on the brass threads where the bottom is dulled and the top part is newer-looking.

Then looked into the socket in the carb that the emulsion tube screws into -- the first half of the threads clearly look more 'used' then the bottom-most threads.

I found that on all 4 carbs.  Gott dang weird man.   Good ole meticulous Honda getting it wrong on the early cb750 emulsion tube length.

[madmtnmotors]

Maybe they're just happy to see you...? 

[Magpie]

"Good ole meticulous Honda getting it wrong on the early cb750 emulsion tube length."
BLASPHEMY!!! Go to your garage and polish something 'till it shines!
Cliff.

[Hondawggie]

"Good ole meticulous Honda getting it wrong on the early cb750 emulsion tube length."
BLASPHEMY!!! Go to your garage and polish something 'till it shines!
Cliff.

gotta admit it just dont sit well when Soichiro took his eye off the ball like this, not like him at all he musta been havin problems with his mistress at that time er sumthin, he just never made too many mistakes, when he does it stands out

[grcamna2]

I like those early CB750 carbs SO much better than the later ones;I don't blame you for wanting to dial them in exactly as they should be. Nice Carbs !

[ekpent]

Don't overtighten them as you can crack the alloy body of the carb or as some have pictured bend them to useless junk.

[WhyNot2]

Whatever you do don't run them all the way down:

Ask me why I know this.........................................:

[Hondawggie]

Thanks for the photos budlite, I started to get after these emulsion tubes just imagining some leftover crud in the threads that would give way if only I torqued my wrench a bit harder, now I see I'm not the only one who thinks 'all the threads must go in there'
live and learn   

[333]

Maybe they're just happy to see you...? 

I'm thinkin' someone dropped a Viagra in the tank.

[nightpoison]

What \ever you do don't run them all the way down:

Ask me why I know this.........................................:

I ran one of the four all the way down............   .............. where do I buy replacements???

[WhyNot2]

What \ever you do don't run them all the way down:

Ask me why I know this.........................................:

I ran one of the four all the way down............   .............. where do I buy replacements???

Dayyyyum.........I've had this CB750 since 2011.....crap, time flies......!!!!!!!

Ebay.......old carbs....get lucky and find them from members here.

I got lucky and found them on ebay...........not cheap either.

Paid a quarter of what I paid for the whole bike.   Good Luck, bro

[ekpent]

What \ever you do don't run them all the way down:

Ask me why I know this.........................................:

I ran one of the four all the way down............   .............. where do I buy replacements???

PM this Gentleman, Harisuluv,  and see if He can sell you one and fix you up. Bet he can.  http://forums.sohc4.net/index.php?topic=105640.0

[nightpoison]

What \ever you do don't run them all the way down:

Ask me why I know this.........................................:

I ran one of the four all the way down............   .............. where do I buy replacements???

PM this Gentleman, Harisuluv,  and see if He can sell you one and fix you up. Bet he can.  http://forums.sohc4.net/index.php?topic=105640.0

Hey thanks for the suggestion. I actually ordered 4 from cmsnl.com. it seems they have them ready to ship. Not cheap, but hey i havent been on the bike yet and this should be the last thing before i can be out on the road.

[Don R]

Not a defect, it's how all of mine are.

[DH]

Yep, and the reason they don't go all the way in is because they bottom out on the needle jet.
I discovered that looking at a set of partially assembled carbs that I'd robbed the needle jets from.

[CustomUnderdog]

Which I had read this before rebuilding my keihin PD42 carbs. The emulsion tubes are headed for the trash...
I need to find a seller with these emulsifier tubes, anyone know where i can order them.
Thanks

[flybox1]

Which I had read this before rebuilding my keihin PD42 carbs. The emulsion tubes are headed for the trash...
I need to find a seller with these emulsifier tubes, anyone know where i can order them.
Thanks

PM forum member harisuluv

[CustomUnderdog]

HELP !!! you've posted this a while back.
Where can I find emulsion tubes for a PD42 carb, cb750k8
Yes yes i messed them up ;(

[flybox1]

HELP !!! you've posted this a while back.
Where can I find emulsion tubes for a PD42 carb, cb750k8
Yes yes i messed them up ;(

as i stated in my previous post...PM forum member harisuluv.