[misterguitar]

I have a 73 CB450 I'm going through. I just soda blasted the carbs so they look all nice and pretty. the carbs APPEAR to have all the original Keihin brass. I can't tell about these needles though. Is there a good reference chart for all the 450 years as to what model carbs they had and what jet and needle#'s they had originally?

 

[66Sprint]

More important would be what carbs you actually have..... Number is on flat just above carb bowl, facing the air-cleaner...

 

[tbpmusic]

All CB/CL through K4 (including K0) used needle # 16012-292-004 - this would be with 14H carbs (except K0).
Later models (including 500T) used needle # 16012-346-004, with later 7xx series carbs.
Always stick with your old brass if possible - modern aftermarkets are junk.

 

[WintrSol]

Interesting ... my list shows the first 5 digits of the part numbers are 16151 and 16113, respectively.

 

[tbpmusic]

Here's the one I trust the most....https://shop.smithscyclecenter.com/OEMpartfinder.htm

 

[66Sprint]

Presumably, you want the actual number that is stamped into the needle, NOT the part number anyway..... My 14 H carbs have 053000 needles in them...

 

[tbpmusic]

Presumably, you want the actual number that is stamped into the needle, NOT the part number anyway..... My 14 H carbs have 053000 needles in them...

Was this the right side 14H you were going to send me?? (hint, hint)

 

[66Sprint]

Nope, that one is all boxed up, but haven't got out to send it yet......

 

[misterguitar]

Carbs are 723A
Needles are D52301

I know the reproductions are crap. I didn't see the tiny K on the needle so Iw as tryito deduc eif they were Keihin or replacements. They have a plastic chuck on them so maybe that covers it up?

 

[Marcus17]

Carb models & jet sizes

Here's a chart I found with carb models & jet sizes.

https://docs.google.com/spreadsheets/d/1L-vvWb_MpY6JGYEVLJUMxnOAQYA1oqjWh9gOOlWxSlE/edit?usp=sharing

 

[misterguitar]

Here's a chart I found with carb models & jet sizes.

https://docs.google.com/spreadsheets/d/1L-vvWb_MpY6JGYEVLJUMxnOAQYA1oqjWh9gOOlWxSlE/edit?usp=sharing

This list is GREAT! Thanks!

 

[misterguitar]

ok. So the one other thing I have noticed. Is there a difference in emulsion tubes between the different carb versions? The tubes on my 73 have 4 holes on one side. The carbs I have from the 68 have 4 holes on one side and 2 on the other side. I know the needles were different on these two.