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Carburetor Tuning for 45mm OER

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Old 12-29-06, 06:30 AM
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Carburetor Tuning for 45mm OER

Ok guys, given my recent trouble and woe with ahorrible rebuild kit on my nikki, I have decided to get this carburetor:

http://cgi.ebay.com/ebaymotors/ws/eB...m=280030709275

Now, they said they will rejet it for free. I plan on telling them that I own a 79 RX7. what specifications would you reccomend me getting for a stock 12a? I plan on doing full exhaust/rats nest removal soon, porting sometime in the future (street).

Thanks guys!
Old 12-29-06, 08:14 AM
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Plans for future porting/upgrade?

Buy a bigger carb. That 45 is a good carb but aint big enough for a real big streetport. Buy at least a 48 DCO instead.

To save you $$$, do a search so you dont have to invest on another carb.
Old 12-29-06, 03:19 PM
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Originally Posted by wackyracer
Buy a bigger carb. That 45 is a good carb but aint big enough for a real big streetport. Buy at least a 48 DCO instead.

To save you $$$, do a search so you dont have to invest on another carb.

the rx has about 15k miles on it, I will be streetporting it when that engine goes south. should be a few years from now. for this time, I will just use this carb. any specifications I should tell them?
Old 12-29-06, 03:49 PM
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If you want an OER, it might be worth checking out rotaryshack. http://rotaryshack.com/Products/carb...sp?intView=100 I would guess they would be able to more appropriately jet the carb for a rotary than the ebay store.
Old 12-29-06, 04:06 PM
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Originally Posted by Yark79
If you want an OER, it might be worth checking out rotaryshack. http://rotaryshack.com/Products/carb...sp?intView=100 I would guess they would be able to more appropriately jet the carb for a rotary than the ebay store.
I already bought the carb

Now that I looked at that site, I am wondering what else besides the carb and manifold I need.

so far I ordered the manifold to block gasket. Would Racing Beats Part Number: 16487 work for the gasket for carb to manifold? also looking at the air filter, Part Number: 16625.
Old 12-29-06, 08:24 PM
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Be sure it comes with the linkage for accelerator cable.
Old 12-29-06, 08:41 PM
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Originally Posted by wackyracer
Be sure it comes with the linkage for accelerator cable.
it is in the picture with the rear of the carb showing, on the left, correct?
Old 12-29-06, 08:45 PM
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It will not come with linkage for our type of cables. You might have to adapt but I would talk to them first. They seem to do carbs for all types of applications.
Old 12-30-06, 11:16 AM
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Originally Posted by rx7doctor
It will not come with linkage for our type of cables. You might have to adapt but I would talk to them first. They seem to do carbs for all types of applications.
I sent him a message asking if it was just the carb body, and if it came with gaskets and linkages and whatnot. I guess the jets on it are good as is.
Old 12-30-06, 03:03 PM
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fawk that i run a 45 with a big streetport and it's blowthrough...
Old 12-30-06, 03:55 PM
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Originally Posted by Hyper4mance2k
fawk that i run a 45 with a big streetport and it's blowthrough...
How is the tuning capabilities on your carb? Is it noob-friendly?
Old 12-30-06, 04:18 PM
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Tuning these carbs are quite easy if you know how they work. If not it's all jiberish. All the searching in the world will not help you unless you teach yourself.
I was in the same boat as you are now. Do yourself a favor and get a book on Weber dco/dcoe carbs. The Weber parts are interchangeable with the oer and they are almost identical. I bought a couple of books and read them both. "Weber carburators" by Pat Branden, and "How to build and power tune Weber and Dellorto carburettors" by Speedpro series. Good books. A particular set up that works for one, doesn't mean that it will work for the other. Fuel jets, air jets, idle jets, pump jets, venturies, emulsion tubes, etc. If you don't know what they do, you will not know how to trouble shoot and tune your carb.

Those impulse buys will kick you in the *** sometimes. PM Robert at the Rotary shack. He's a pro with these carbs.
Old 12-30-06, 04:31 PM
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Here you go:
Found these in another thread
Streetport 12A:

Idle 65F8
Main Jets 185
Air Corrector 220
Emulsion Tube F11
Pump Jet 45
Chokes 40
Auxilliary Chokes 5.0
Old 12-30-06, 05:59 PM
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Originally Posted by Kim
Here you go:
Found these in another thread
Streetport 12A:

Idle 65F8
Main Jets 185
Air Corrector 220
Emulsion Tube F11
Pump Jet 45
Chokes 40
Auxilliary Chokes 5.0
Could you link me to that thread?

I hope they have something like that for just a regular 12a, thats what I have ATM.
Old 12-31-06, 08:41 AM
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I will just give them those specifications for the SP
Old 12-31-06, 08:46 AM
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seems like it comes with carb only. any place I can find the additions to it? The places I have seen have the carb + everything on it, but not seperate...
Old 12-31-06, 09:23 AM
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never mind,found it!
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