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  #1 (permalink)  
Old 03-31-2017, 12:55 PM
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Mikuni carb with Ultima 127"

I'm looking into getting a Mikuni carb to run with my 127" that is now bored .010 over. The questions I have are:

- Mikuni 45 or 48?
- What size jets should I use with this setup?
- Will a stock S&S manifold work or will I have to get a Mikuni manifold?

Thanks in advance!
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  #2 (permalink)  
Old 03-31-2017, 02:20 PM
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48/45...you really won't notice the difference!

Jetting will depend on your exhaust/Air Breather/cam...etc...

You can use your S&S manifold but you will need an adapter...Like this...But, you will need to shim your Breather out a bit.




Last edited by Mr Scary; 03-31-2017 at 02:28 PM..
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Old 03-31-2017, 03:19 PM
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OK. Like a spigot adapter I'm assuming. I'm running Martin Bros Daisy Cutters
(1.75-2-2.25). A Spike cleaner. And a Redshift 656V2 cam.

Thanks Scary
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Old 03-31-2017, 10:47 PM
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Ultima had spigot manifolds at one time. If you use it you wont have to space out the breather.

On the D&M bracket we used to use an 11/16 spacer to take up the added space from the adapter. It doesnt leave much threads to attach to the heads. D&M used to offer cut to length breather bolts that worked well for this.

I run a 45 on my 113 I built it back in the stone age when they didn't have internal breather/carb supports. All I did was move the air cleaner backing plate supports to the out side if the banjos for the breather and it fit nice.
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Old 04-01-2017, 05:05 AM
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I'm gonna say the 45 will be easier to tune and might be a little more responsive. Like Scary said, for the most part, you'll notice no real difference in your every day riding. The 48 might make for a couple of extra horses on the dyno nut that's it.
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Old 04-01-2017, 07:10 PM
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So I'm not buying a bunch of shit I don't need, when I get the HSR45 carb all I should need to bolt it up with the stock S&S intake maifold and spike cleaner would be:



and



Correct??
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Old 04-02-2017, 09:29 AM
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you will need to respace the carb support also. Which is no big deal if you are running this sort of carb support


If you are running this type that most spike Air cleaners use


You will need spacers between it and the head and longer hollow bolts to attach it.
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Old 04-02-2017, 09:34 AM
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Quote:
Originally Posted by pushrod243 View Post
you will need to respace the carb support also. Which is no big deal if you are running this sort of carb support


If you are running this type that most spike Air cleaners use


You will need spacers between it and the head and longer hollow bolts to attach it.
Thanks. I am using the bottom bracket with longer bolts. I was actually using spacers also with my spike! But I would also need the spigot adapter as well as the air cleaner adapter as well. Correct?
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Old 04-02-2017, 11:58 AM
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Yes the spigot adapter will allow you to bolt the Mikuni to the intake . You might have to redrill your carb support/breather bracket if your original had an S&S bolt pattern. The S&S pattern was countersunk to attach to the carb. The threaded holes are for the CV carb which is the bolt pattern in the air cleaner adapter. Just drill them out so the airt cleaner bolts sandwich everrything and you are good to go.

The one pictured above is for an S&S.....The Cv carb uses the 3 bolt pattern where the left hand bolt in the circle is a 9 oclock.
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Old 04-30-2017, 02:32 PM
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Hopefully one last question! If I went with the spigot type manifold with the Mikuni 45, do I even need an adapter(Probably a dumb ass question!)? And if I do what adapter do I need?
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Old 04-30-2017, 02:42 PM
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OK, scratch the last post! What spigot type manifold for my evo would fit with the Mikuni 45?
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Old 04-30-2017, 02:48 PM
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The adapter is if you were going to use the S&S manifold....

Just get the right manifold...Pushrod can get it for you....

http://www.ultimaproducts.com/Mikuni...ifoldGuide.pdf
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Old 04-30-2017, 02:51 PM
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Quote:
Originally Posted by Mr Scary View Post
The adapter is if you were going to use the S&S manifold....

Just get the right manifold...Pushrod can get it for you....

http://www.ultimaproducts.com/Mikuni...ifoldGuide.pdf
EXACTLY what I was looking for! Thanks brother!!
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Old 05-19-2017, 09:38 AM
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I just bolted the mikuni 45 onto my 127" and I put the shorter idle screw on. When I begin to adjust it do I bottom it out then take 2 full turns back as a starting point?
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