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Discussion Starter #1
Switching to Bike Carbs. Heres a write up!... IT IS COMPLETE!

Hello everyone!
This is going to be my first write up. Please feel free to ask questions and make suggestions! http://****************.com/smile/emthup.gif By the end of this build i hope to have step by step instructions so that all you good folks out there can set up some bike carbs too!

I recently traded my 77 rabbit for an 82 Caddy with a 2.0 swap. The CIS fuel system was never fully installed, and is currenty hooked up just so that it gets me from A to B. I have been researching on what route i want to go with the fuel system and have decided to go with some bike carbs! My reason for this choice is my extreamly limited budget (Currently going to tech school, typical poor student
), the ease of the install, and the effeciancy of bike carbs over Weber carbs.
My plan is to gather and fabricate all of the needed parts and then spend my Winter break installing and tuning the carbs. I will be trying to contact "Bogg Brothers" to figure out what jet sizes i need and order a few smalll parts.
Parts List Needed (please contribute if im missing parts):
Bike Carbs
Correct Jets
Fuel Pressure Regulator
Manifold
Fuel Hose
Tonight is day one of my gathering. I purchased a set of Yamaha YZFR1 Carbs off ebay. I cant wait for them to arrive so i can get them all cleaned up! Ill begin posting pics ASAP.
Here is an artical and a couple vids to get you PUMPED!
http://www.totalvauxhall.co.uk...7.pdf
http://www.youtube.com/watch?v=Tb7ILh6ZxxA
http://www.youtube.com/watch?v...lated


Modified by Miami Blue at 10:35 PM 1-3-2010
 

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Wow please keep us updated as much as possible. I'm also a poor student who has been looking into starting a project using carbs. This seems like a much cheaper route than dual webers.
 

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Discussion Starter #3
Re: (Flyingsheep)

Yes wayy cheaper. Carbs are off a year 2000 bike and were $150.
You in Marysville, nice. Home for me is La Conner, WA. I cant wait to go back!


Modified by Miami Blue at 10:36 PM 11-13-2009
 

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Discussion Starter #5
Re: (Flyingsheep)

Ill be coming back after i graduate Oct 22 of next year. And yes! The project will be coming back up with me!
 

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Well maybe by then we'll have to... you know.

Is it me or from those videos it seems like bike carbs idle a little rough? Unless they are running agressive cams?
 

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Discussion Starter #7
Re: (Flyingsheep)

They may be running cams, i have some pretty agressive cams and they sound mean without the carbs.
Mainly the noise is the carbs though, they open straight to the cylinder. No intake piping or filters muffeling the noise.
 

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Ah. I'm just very familiar with the sound of webers and bike carbs have a different sound which is interesting. Do you know if those manifolds have vacuum ports for the brake booster? If not how do you deal with that? I'm also curious about the dizzy vacuum advance and if you need it.
 

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Re: Switching to Bike Carbs. Heres a write up! (Miami Blue)

Quote, originally posted by Miami Blue »

Parts List Needed (please contribute if im missing parts):
Bike Carbs
Correct Jets
Fuel Pressure Regulator
Manifold
Fuel Hose

I would look at the Holley FPR PN 12-804 ($30-ish everywhere I looked) and a FP gauge so you know what your pushing in to your carbs.
Jets, I bought 4 sets, 165, 167.5, 170 and 172.5 I think?! They are a few bucks each and IMO worth spending a few bucks on insted of drilling.
Wideband, your gonna need one. I bought the Inovate LC-1 with gauge. You can find them used on here from time to time.
Silicone couplers to connect the carbs to your mani.
TON of clamps! A lot of sizes!
I'll think of more Im sure!
Cater fuel pump, 4070. I tried 2 cheaper ones with no luck.



Modified by FROZEN337 at 5:36 PM 11-14-2009
 

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Discussion Starter #11
Re: Switching to Bike Carbs. Heres a write up! (FROZEN337)

Hey thanks frozen!
Did you do this swap on a 9a engine? If so, what size injectors did you go with? I went in to the Yamaha shop to price how much it would be to get a whole bunch of different sizes, nice and cheap!
I read up on what alot of other people did for fuel delivery and was probably going to use the CIS pump and an FPR with a return line to the tank to help keep the pressure safe.
As far as a vacuum source for the brake booster, ill just T out of the manifold that me and my brother will be making. I would assume that you could a vacuum advance dizzy the same way too. For now im sticking to stock ignition though.
Down side to this swap is that i wont be able to have AC
. Here in Phoenix... its pretty nice to have. To make the carbs fit i will have to move the alternator to the AC compressor spot, an then chop off the old alternator mount.
Some other people have issues with their radiator being in the way due to where the hoses go in to the radiator. I have a duel pancake fan set up already installed though so it looks like this wont be an issue. Specially with the AC cooler gone, i can move the coolant rad forward more.

Modified by Miami Blue at 5:17 PM 11-14-2009


Modified by Miami Blue at 9:31 PM 11-14-2009
 

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Discussion Starter #12
Re: Switching to Bike Carbs. Heres a write up! (FROZEN337)

Does anybody have templates for manifolds they made?
 

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Re: Switching to Bike Carbs. Heres a write up! (Miami Blue)

Im running a OBDI ABA with the stock MKI ignition system. Prolly not the best set up, but it works for me.
I used wraping paper roll to get my angles right! They are the same size as the 1.75" Autozone exhuast pipe I used for my mani.
I would ditch the stock fuel pump and run a low pressure unit, FPR and gauge. I picked up a cheap FRAM filter for under the hood, because Im that cheap! Had a nice glass filter but the housing split when I put the fittings in . . .
I dont have issues with the rad/carbs all fitting, its REALLY close with my filters on, but not an issue. Right now I have some mesh from Lowes on there because I killed two filters thanks to back fire in the carbs! ALT is close to, but they dont touch.
All said and done, it is cheap, it is easy, BUT it will be a PITA getting it all TIG'd, fitted, running! Sound is awesome and it is so worth it!
 

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Discussion Starter #14
Re: Switching to Bike Carbs. Heres a write up! (FROZEN337)

Good call on the wraping paper roll, ill have to find some. How about your flange? Did you just cut down a stock intake?
Another decision i have to make is do i want to go fancy and get AN fittings and hose or do i want to save money and go with rubber hose and cclamps. The saving money part sounds preferable to me!
Its nice getting help from some one who has done this. Props man.
 

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Re: Switching to Bike Carbs. Heres a write up! (Miami Blue)

I used gasket outline to make the flange. Any decent metal shop can cut it out with water jet or plasma cutter, if you dont have you.
I ran C clamps and rubber fuel line!
 

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Discussion Starter #16
Re: Switching to Bike Carbs. Heres a write up! (FROZEN337)

C clamps it is then!
Did you just use the flange to cover the injector space in the head?
 

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Re: (Flyingsheep)

Quote, originally posted by Flyingsheep »
Isn't an FPR unnecessary if you go with the carter 4070?

Absolute myth. If you look up the specs of the carter, it's WAY more than most sidedraft style carbs need. If it's running without an FPR, then there is also something wrong with the setup that is limiting the fueling, like too-small needle valves, or restrictions in the lines.
 

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Discussion Starter #19
Re: (Flyingsheep)

On my engine i will have to move the alternator down to where the AC comperssor is located. Which means no more AC for me http://****************.com/smile/emthdown.gif. Im just using the existing bracket, not a serpentine set up.
Today I picked up one of those cheap FRAM filters FROZEN was talking about
. Ill eventually get a better one.


Modified by Miami Blue at 4:43 PM 11-15-2009
 
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