How to plumb this carb?

[Alexander]

Hey, I’m just entering the sport and I have a 2008 crg kalifornia. I’m almost done prepping it, one of the only steps left is to plumb the carb correctly. Now I understand this is a pump around setup but I couldn’t find directions on how to set it up for this older carb.

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So lets do all directions with the front facing forwards. (the air intake side). Ok so the larger barb on the left side is the fuel supply from the tank. Correct?  The rest I’m lost on.

Also one more question is it ok for the carb to be mounted at a 45 degree angle?

I really can’t wait to get this on  the track. Are any of you from the New York tristate area. Any opinions on Oakland Valley Speedway? I’m thinking that may be my home track.

[johnny brooks]

That carb does not look like its been modified for pump around. No return tube visible.  What does the fuel pump look like…can you post a picture of it.

No you can’t run a float bowl carb at a 45 angle….needs to be vertical with bowl on the bottom.

Oakland Valley is a dirt oval I think….do they even have a class for a shifter?

If you end up running sprint or road race you will need to move that radiator, too.

Sprint and road race have pretty specific rules. You will need to know the year of your motor….specifically the cylinder, head, and ignition.

Find where you can run, talk to people at the track, get a rule book.

Have you driven a shifter kart before? You say you are new to karting. A shifter is not exactly a ‘beginner’s ride’.

Go here and scroll down for diagram of how pump around works:

http://eknclassic.com/viewtopic.php?t=105790&highlight=pump+around

Hope that helps.

 

[Alexander]

Thanks for the tip on carb angle. So it may not be a pump around I thought it was because of the lines on top crossing left to right. None the less my question still stands.  What do I do with the brown tube pointing down from the top; as well as the tube extending past the bottom of the carb. Where does the nipple on the bottom float portion have to connect too? I assume there’s a post or article that explains this but I can’t seem to find it.

Oakland Valley Race Park is the name, It’s right next to the speedway I think though. The track looks nice, perhaps a little bumpy.

I haven’t ever driven a shifter kart before, but I have been road racing/autocrossing for a few years now. My track car is a  e30 325i with a bored eta2.7. I love it but road racing is another level of expense, even compared to karting. (which I’m learning isn’t too cheap either starting out) . I have driven my friends kt125 eagle kart. Not the same I know, but I love to race so I should be ok. (and it was too slow, especially down low)

Can a shifter power-slide on MG reds in a hairpin or slow sweeper? How fast are these things?  Motor is a cr125 ’95 head stock porting, ’99 ignition, RLV 4 exhaust, Wisco piston.

 

[Roger Miller]

The bottom nipple is just a drain.  doesn’t have to connect to anything.  Doesn’t look like a pumparound as it is missing the port for the return pump.  The other thing, pumparounds have no floats so if you have floats still in the carb, then for sure it isn’t a pump around.

The tubes you have shown are all vents.  The two ports that stick out sideways, may or may not be blind.  Meaning, they may not be drilled through.  If they are, then you need another hose wrapped with the ones you have already to control slosh out of those holes  Run a hose from one port, over the top of the carb, to the other port and cut a small hole at the highest point to open that hose to atmosphere.

Usually, we run two tubes for the 4 vents.  like I describe above.  Both just connect a port from one side to the other and then we snip a hole in the area where it is highest above the carb.  So one less hose, and all 4 venting ports covered.

Depending on where you run, you likely also have to update the rear bumper to a full width bumper.  Check Bergfelt bumpers online or contact a local shop that can assist you with proper fitting.

 

[Gabriel Podboj]

Just one observation… radiator in the back????… I can see a very short life on that radiator..

Do a  favor to yourself and move that radiator to the left side

Welcome to karting

[Jim Derrig]

Alexander wrote:

I have driven my friends kt125 eagle kart. Not the same I know, but I love to race so I should be ok. (and it was too slow, especially down low) Can a shifter power-slide on MG reds in a hairpin or slow sweeper? How fast are these things? Motor is a cr125 ’95 head stock porting, ’99 ignition, RLV 4 exhaust, Wisco piston.

How fast is a 125 shifter?  Well, my Skip Barber instructor said he thought the next step up from a shifter is an Indy car.  Regardless of whether he was exaggerating, it’s several levels of performance ahead of that E30 you’ve been auto crossing.

If a KT100 (there’s no such thing as a KT125) seemed slow “down low” that probably was because you were not carrying enough speed into the corner.  A competition kart, and really any open wheeler, will have a much higher entry speed than that tin top you’ve been driving.  For example, a 2.5 g mid corner transient is common in a kart and all but unachievable in a modified street car.   It’s a 2-stroke so you are not going to power your way out of a corner with low end torque.  Rather, you’ll carry way more speed into the turn and get on the throttle much earlier because the grip is so much higher and because you need to keep the revs up.

Can you “power slide” it?  Oh yea.  But be careful.  The polar moment of yaw inertia in these things is almost zero, so it will spin almost on a thought.

[Tyson Henry]

You will definitely be sliding on MG reds with a shifter…

The bottom nipple is the overflow line. I would put it in a catch can….don’t leave it unconnected.

[Alexander]

Thanks for all the advice.  I was already planning to move the radiator, its there because the mount I got from Sharkshifter was completely wrong. It will only be in the back for the shakedown run.

Jim Derrig wrote:

If a KT100 (there’s no such thing as a KT125) seemed slow “down low” that probably was because you were not carrying enough speed into the corner. A competition kart, and really any open wheeler, will have a much higher entry speed than that tin top you’ve been driving. .

I actually didn’t get to drive it on the track. So admittedly it was out of its element. It did feel decent between 20-30 mph. But some of my karts life is going to be spent on private roads up north so low to mid speed acceleration is of importance to me.

The e30 may be a tin top but I haven’t found a modern chassis that can even compare to the neutrality in oversteer the e30 has. I could safely teach anyone to drift in the snow with an e30. I digress though :)

Does anyone have advice on how to make my intake fit. If the integrated intake coupling (on the outside if the reed cage) is facing towards the center of the chassis my seat brace is in the way of attaching  any sort of intake filter to the carb. But if I flip the coupling to point away from the chassis I can’t have the carb vertical it hits the crankcase. It would have to be angled which I now know won’t work. I’m sure someone else has had this problem. I’ll post pictures of the exact setup once I get home in a few hours.

[johnny brooks]

But some of my karts life is going to be spent on private roads up north

Probably not a good idea.  Don’t become another sad story of a new karter being killed after losing it and hitting a pole or fence post while ‘practicing’ on a road.

If you want to drift and play somewhere, get a fun kart or a used concession kart.

A shifter kart is not a play toy….it can and will kill you if not treated with the proper respect.

Your question about the carb angle shows you have a limited knowledge of mechanics and your admitted inexperience of driving a kart are adding up to potential disaster.

You need to hook up with someone at the track who can steer you in the right direction.

We love to welcome new karters, but also want them to be around for a long time, too!

[Bob Baldwin]

+1 on johnny’s comments . Shifters are NOT a TOY

 

 

 

 

 

 

 

 

+1 on what johnny said . Shifters are NOT a toy

 

 

 

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[Alexander]

Thanks fellas I appreciate the concern.

johnny brooks wrote:

Your question about the carb angle shows you have a limited knowledge of mechanics and your admitted inexperience of driving a kart are adding up to potential disaster.

You shouldn’t be so quick to judge. You don’t always know the skill level of a new member.  I actually work at the BMW VDC in New Jersey. My job is to finish prepping cars ordered through the BMW Individualization program. Most of the cars I prep are M’s and quite a few I install Dinan accessories on. I have to shake them all down before I sign off to have them shipped to dealers. I also have had training with BMW instructors at Lime Rock. I know your all driving enthusiasts as well, and that’s why I’m excited to join your community. Suffice to say I can take care of myself just fine though.

Despite what I do for a living, I really don’t know anything about 2 stroke engines. And I’m too young to remember carbureted vehicles. Hence my question. I’ve since looked up the operation of float carbs. very simple and efficient.

I figured out my intake problem by relocating the seat brace. Thanks for all the help I’ll be sure to post a reaction thread when I go for a ride.

[Alexander]

Ok after speaking to a friend with shifter experience, I’m sure I wont be driving it off the track. Thanks for the heads up.

I’ll still post that reaction thread.

Happy and safe karting guys.

[Author]

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