[turboguzzi]

8V euro carbed manifold

 

[turboguzzi]

my 3K carb, had no vaccum ports, used the ones already in manifold

 

[SammyAllTheWay]

@89Kickit2 my 3K didnt have notches like yours, so i made a 4mm nylon spacer with notches for both screws. its an excellent material, fuel resistant and easy to machine, I use nylon all the time on inlet systems of racing motorcycle engines i build that get VERY hot, but being on a manifold that constantly flows cold air, heat shouldnt be an issue

My car is a euro model so originally with a mikuni carb, the stud spacing was exactly like in the 3K so no stud adapter was needed.

Your carb has already the notches so you dont even need to make them in your spacer.

Had to build a bracket for the different position of the throttle cable and for the choke cable as the mikuni carb is auto choke.

Car started at first try with the 3K but felt lest responsive and fuel consumption was high, guess some rejetting was due, but as i overhauled in the meantime the original mikuni, that went back in. This how the mikuni looks like, its amazingly well engineered, but dotn thinkl youll find it in the usa


View attachment 120886

So basically CM makes the notches because their carbs have none? So some carbs need them and some don't?

 

[turboguzzi]

all of them need them. so its safety measure in case carb doesnt have them like in mine

 

[89Kickit2]

I do have a 3k and the notch is on the primary, there is a couple of different versions of the 3k which might make some difference, some labeled 21100-24035, 21100-24034, 21100-24045, TOY-250 etc, so maybe that's the difference and why yours has the notch on the secondary yet most don't.
You carb has vacuum ports on the primary and secondary tho right?
I've seen many spacers on weber kits made out of some sort of metal, so I don't think it should be a problem with heat or anything really\

I just found a picture of a carb exactly like yours

Well, actually that carb has just the one port. You're right about the spacer because my Weber conversion has the metal 2-piece adapter (shown on manifold above) and no phenolic insulator.

 

[89Kickit2]

So basically CM makes the notches because their carbs have none? So some carbs need them and some don't?

Apparently so but all the carbs I've checked on eBay & Amazon there is the one on the secondary. And then there's mine that has both

 

[89Kickit2]

OK, it's a little clearer now I think and I guess I'll just go for it soon.

 

[turboguzzi]

your carb certainly has two notches in the mating face...

 

[2013GV]

You heed the vacuum to get to the ports on the carb base, the 26 to 28 taper is required to give good idle and to stop flat spots just off idle. If you don't mind a bit if a stumble then a 28 hole should work, but I can't guarantee it will be nice to drive.

If a 28 hole would have done the trick then the adapter plate would have it instead of the tapered hole.

 

[turboguzzi]

GV, it doesn't happen often, but totally disagree with you here....

 

[2013GV]

GV, it doesn't happen often, but totally disagree with you here....

Thats fine. If you have had one work on straight hole adapters then kudos to you.

 

[SammyAllTheWay]

OK, it's a little clearer now I think and I guess I'll just go for it soon.

Good luck man, It should work now that we see how it is, I really hope it does, keep us updated