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Carb Float Adjustment Clarification

Fuel System: Gas (Petrol) tanks, Carburators
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Gun
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Post by Gun » Sun Sep 07, 2008 8:24 pm

oh and white exhaust began to come out of the left exhaust (same side as sticking slide) as the bike warmed up.

edit: took a look at the plugs this morning. black soot at their base.
'65 CB77
'66 CB450k0
'93 HD FXR

Gun
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Post by Gun » Mon Sep 08, 2008 11:16 am

the black soot makes me think that my needles are worn, letting gas get through, fouling the plugs. Not sure if that has anything to do with slow throttle response or white smoke. Will new carb kits fix this or am i looking at new carb bodies?
'65 CB77
'66 CB450k0
'93 HD FXR

mca2
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Post by mca2 » Sat Apr 30, 2011 6:58 pm

The trick described by LoadMouse and sketched by Deez seems handy, but just for my understanding, how to you measure the correct float level (see attached sketch)?
1. from the lip (heigher edge) of the body to the top of the float
2. from the gasket to the top of the float
3. from the lower body face to the top of the float
All of the above of course with the float arm just touching the float valve.

With:
- 26.5mm float height for 22mm carbs
- 22.5mm float height for 26mm carbs
Attachments
float level2.png
float level2.png (6.15 KiB) Viewed 6745 times

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brewsky
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Post by brewsky » Sat Apr 30, 2011 7:17 pm

My vote is for "3"......some others will say "1",...never heard anyone say "2".

There is another possibility......."3" but on top of the "Bead" that actually seals the gasket which is cast in the lower body face.

If you have a CB or CL with PW26's, just use LM's line of sight method, and don't worry.

If you have a C or CA.....the worry might always be present!
66 dream, 78 cb750k, 02fz1, 09 wing

mca2
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Post by mca2 » Sun May 01, 2011 3:43 pm

I did some measuring, and measuring from the top of the jet holder (method LM) to the top of the carb body (method 1) i get a bit over 23mm. So i assume method 1 should be corect.

Btw, i found out my floats were at about 28mm (making it lean) and my needles in the bottom groove (making it rich). I've set things according to the book, let's see how things workout with my repro-mufflers without dampers.

e3steve
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Post by e3steve » Tue May 03, 2011 2:19 pm

mca2 wrote:The trick described by LoadMouse and sketched by Deez seems handy, but just for my understanding, how to you measure the correct float level (see attached sketch)?
1. from the lip (heigher edge) of the body to the top of the float
2. from the gasket to the top of the float
3. from the lower body face to the top of the float
All of the above of course with the float arm just touching the float valve.

With:
- 26.5mm float height for 22mm carbs
- 22.5mm float height for 26mm carbs
3! The metal Honda 'height gauge' sits in the recesses and measures the height from the gasket face on the body, not from the lip.

CL77NOW
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Post by CL77NOW » Mon May 30, 2011 4:11 pm

I cant say for 22 mm but.. PW26 is:
and the alternate method of "JUST see the bottom of jet" < dog dont hunt for me.
the Bill silver 7.5mm does play. i did it both ways to see if he was correct (pw26)

FYI
i too see lots of basic questions on service fully covered in the honda common manual.

http://www.4shared.com/document/6FxmkuP ... anual.html
analog book., cept the PDF kind,
non searchable so is closest i could come to ANALOG.

almost every thing is there, but jet sizes (torques,etc) . ways and means, for all bikes.

this is the book , new honda techs must learn circa 1988.
still applies. but not here, (they show slab base carb)
Attachments
float-level-oops1c.JPG
Last edited by CL77NOW on Thu Jun 02, 2011 3:57 pm, edited 8 times in total.
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For Sale,

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