Topic: OK, so interesting 750 Carb Questions (with pics!!!)

[VTCBike750]

So I started out with this problem:
http://forums.sohc4.net/index.php?topic=92922.0;topicseen

I have a few odd carb questions

To start off I have 3 sets of carbs
1. Off my running 72
2. An extremely dirty set, that took going to hell and back to clean, off a 75 parts bike
3. An unknown year which was nicely given to me by the PO of my bike.

So Ill start off with the 72 carbs

Im definitely missing something, its the #2 carb.  Its missing the brass insert to the carb breather between #1 and 2 carbs.

Where did it go? MORE IMPORTANTLY, HOW DID IT GET OUT? 

Then theres the crack in the main jet area, how big of a deal is it?



75 Carbs

They were DIRTY! Everything was frozen and varnished.



Learned to clean carbs with these back in Nov. and was thinking of using them Until...
What the hell did some PO in SC due to these poor carbs?  
There are holes drilled in the carbs where the airbox attaches.  Why would you do this?
How does one go about fixing this? JB Weld? Im affraid of it getting loose and getting sucked into the carb, then engine. I just dont get it.




The unknown year

Im just wondering when they started using these plastic caps in the air screws?




Is there a main difference between these carb years except for the 105 vs 110 jet sizes?

The carb bodies on the 72 have 3-R and 3-L  on the inside.
The other 2 have 4-R 72-9 and 4-L 72-9 on the inside

[ekpent]

Those plastic caps on the air screws do pop off for adjustment or removal of the whole jet and spring.Think they are later model like 75 or 76.You may want to use those with the larger jets if they are in the best shape.That first pair you are currently useing look a little dodgy with the cracked main jet holder etc.

[Johnie]

Your very first pic with the missing brass plug...that is normal. Mine are the same too. This question comes up every so often, but yes they are made that way.

[VTCBike750]

That first pair you are currently useing look a little dodgy with the cracked main jet holder etc.

Already swapped the jets and getting ready to put them on the bike

[VTCBike750]

Your very first pic with the missing brass plug...that is normal. Mine are the same too. This question comes up every so often, but yes they are made that way.

So My #3 has two brass inserts. I understand that #1 and 4 are supposed to be missing them on the ends, no breather there. 

But Its #2 on the side next to the breather tube between carb 1 and 2!  That just cant be right.