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Author Topic: KZ400 2-1 Intake  (Read 2217 times)

Offline madmatt1

  • Posts: 350
KZ400 2-1 Intake
« on: Jun 06, 2012, 19:13:40 »
I've been kicking around the idea of making one of these for my 1975 KZ400. Anybody here have any success
stories? I'd kinda like to make one out of copper... Is it possible to braze copper to metal? The idea would be to burn the rubber off of the stock carb holders and use them as "flanges" for the 2-1 intake. Just an idea..
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline Bobbed_out

  • Posts: 396
Re: KZ400 2-1 Intake
« Reply #1 on: Jun 06, 2012, 19:17:56 »
There is a guy that makes copper 2-1 intakes specifically for the kz400...can't remember the website, but I think they were around 80.
76 kz400- bobber project
75 cb360-cafe project
90 vfr750-???

Offline Bobbed_out

  • Posts: 396
Re: KZ400 2-1 Intake
« Reply #2 on: Jun 06, 2012, 19:19:16 »
76 kz400- bobber project
75 cb360-cafe project
90 vfr750-???

Offline Sonreir

  • Moderator
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  • Posts: 7479
  • Oregon
Re: KZ400 2-1 Intake
« Reply #3 on: Jun 06, 2012, 19:19:33 »
When you say braze copper to metal, I assume you mean steel or aluminum (copper is, of course, a metal)?  In both cases it's possible, though its much each to solder with copper and aluminum can be tricky.

Also, you probably won't be able to reuse the metallic parts of the stock manifolds.  The metal actually isn't very thick and there isn't enough of a sealing surface unless you make some pretty drastic changes.  And then you're probably better off just milling some new ones...

Finally, you should be aware that what you're doing is likely to be a performance downgrade.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1982 Honda CB750C - Project Zoidberg
1963 Yamaha YD3S
2007 Ducati Monster 695

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Offline madmatt1

  • Posts: 350
Re: KZ400 2-1 Intake
« Reply #4 on: Jun 06, 2012, 20:42:22 »
Thanks for the answers guys- great info.

Bobbed_out- Thanks for the link, I have actually come across those in my searches.
The thing that doesn't do it for me is that you have to reuse your carb holders. These are basically
unobtainable for my bike (1975) so it wouldn't do me any good  :(

Sonreir- yes, I meant braze it to steel. (It's been a long day  ::) ) I just like the idea
of doing this because that way I could use what I already have. I have 0 skills when it comes to machining- wouldn't even know
where to start. I am sick of spending time and money on this bike. I don't have the stock airbox and exhaust to use, so this seems
to be the cheapest and easiest way to be able to actually dial it it. I have tried but can't seem to achieve this with my stock CV's.
This bike is slow no matter how you slice it, so I'm not worried about the performance. Running well with a lower overall potential
would be better than not running.
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline diggerdanh

  • Posts: 222
Re: KZ400 2-1 Intake
« Reply #5 on: Jun 07, 2012, 00:52:08 »
The stock carb holders are unavailable but there are alternatives. Take a look at this thread on the KZ400 forums site where a couple different options are shown to work:
http://www.armbell.com/forum/viewtopic.php?t=6202&highlight=mikuni+boot&mforum=kz400

1. The carb holders from some KZ1000s will work if you use a rat tail file to open up the mounting holes just a hair.
2. There is a Mikuni set of holders that matches up perfectly and is easily available anywhere including Amazon.

The drawback to both of those holders are that they are about 1/2" - 3/4" shorter than the stock holders so there may be some fitment issue if you are using the stock carb boots and air box. But since you are using pods then you should be in good shape.

Sorry I don't mean to sidetrack this thread, but I don't see the big attraction of going to a 2 to 1 on the KZ400s, though I know several folks have done it. I guess I understand the simplification of 1 carb instead of 2, and parts are not available for the stock carbs, and the stock CV carbs suck and don't run well in anything but the stock airbox. But why not just switch to a pair of Mikuni VM30s instead? Then you can run pods and tune for it easily. That seems like much better option to me and that is what I'm planning on doing eventually.   

Offline madmatt1

  • Posts: 350
Re: KZ400 2-1 Intake
« Reply #6 on: Jun 07, 2012, 02:03:03 »
No man, that's fine! Like I said, just a thought- I appreciate any opinions / info I can get on the matter.
I've thought about going with some VM30's, but haven't really wanted to put that kind of money into the bike.
I'm sort of leaning towards getting the bike functioning well enough to sell it, and move on to other projects that
I'm more interested in. I'm sick of this bike, to be honest. But maybe I can score a deal on some VM's and get it done that way. Thanks
again for all the info-
« Last Edit: Jun 07, 2012, 02:04:48 by madmatt1 »
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case

Offline sinbad85

  • Posts: 329
Re: KZ400 2-1 Intake
« Reply #7 on: Jun 07, 2012, 06:22:14 »
i think silver soldering would be better then brazing!....

Offline Bobbed_out

  • Posts: 396
Re: KZ400 2-1 Intake
« Reply #8 on: Jun 07, 2012, 09:08:58 »
Sonreir does group buys I'm the Vm's...I got a set for my kz400 from him and he just started another group buy thread in the selling section.
76 kz400- bobber project
75 cb360-cafe project
90 vfr750-???

Offline CoolerKing

  • Posts: 68
Re: KZ400 2-1 Intake
« Reply #9 on: Jun 08, 2012, 13:04:12 »
$15 airbox over at the kawasaki twins forum http://www.armbell.com/kz400/viewtopic.php?t=18253&mforum=kz400
1976 KZ400-D3 -sold-
1978 KZ650-C2

Offline diggerdanh

  • Posts: 222
Re: KZ400 2-1 Intake
« Reply #10 on: Jun 09, 2012, 00:57:38 »
Bobbed_out, have you got those VMs setup on your KZ400 yet? If so, I'd love to see some pics and hear details. Did you go with Vm30s? Like I said, I'm very close to doing the same thing myself. My bike is running well with the stock carbs with the stock intake. But I eventually want to "clear the triangle" and go with pod filters. I figure I could save myself a lot of heartache by getting the VMs. Do you have a build thread for your KZ400? [Sorry for the off-topic, gents - as you were!]

Offline Bobbed_out

  • Posts: 396
Re: KZ400 2-1 Intake
« Reply #11 on: Jun 09, 2012, 08:02:49 »
I haven't started on the kz yet. I have just been collecting parts, plan on starting it this winter, sorry. I got the 30's...I'm sure someone else here has successfully put them on there kz though.
76 kz400- bobber project
75 cb360-cafe project
90 vfr750-???

Offline madmatt1

  • Posts: 350
Re: KZ400 2-1 Intake
« Reply #12 on: Jun 09, 2012, 10:33:12 »
Quote
$15 airbox over at the kawasaki twins forum http://www.armbell.com/kz400/viewtopic.php?t=18253&mforum=kz400

I actually found an air box- it's different than that one though- it's steel. The boots were gone so I've made up some
new ones out of rack & pinion boots. I'm guessing it should work fine, but probably won't look all that great considering there are no side covers on the bike. I don't really care though- just want to get it running well enough to sell it at this point
CL350 build thread:
http://www.dotheton.com/forum/index.php?topic=58435.0

1977 Kawasaki KZ1000
2003 Suzuki SV1000N
1975 Kawasaki KZ400
1977 Honda CB750K basket case