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Author Topic: 1981 Yamaha XS 400 Special II Cafe Racer build  (Read 40312 times)

Offline two-smoker

  • Posts: 994
  • I reject your reality, and substitute my own!
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #60 on: Apr 10, 2012, 03:43:57 »
Man, you should have hella torque with the length of those intake runners, plus the extra velocity of having just one carb....
"I suppose I'd say.... BOLLOCKS! But that's pretty much a reflex for me...."
1973 Yamaha TX500- project Shinjimei

2010 Hyosung GT250R

Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #61 on: Apr 13, 2012, 20:51:54 »
Its alive !  Ended up swapping the coil connectors around and it fired up instantly what a simple fix.  It does run lean on left cylinder and rich on the right but hey its running with the single carb.  Its almost finishied ! need to figure out my license plate mounting and tie up a few loose ends but she is almost ready for the street.  Here are two videos and some more pics:

Walk around video

Drive by video























Offline john83

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  • Posts: 1549
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #62 on: Apr 13, 2012, 21:04:12 »
Nice!

Offline BigBSBusa

  • Posts: 1222
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #63 on: Apr 13, 2012, 23:22:12 »
How's the heat around the legs from the pipes?
BigBS

1974 Honda CB550
1977 Yamaha XS750 - Project Maggie Mae
1994 Kawasaki Ninja ZX11 - Project Raven
1999 Suzuki TL1000R - Project Sable

Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #64 on: Apr 13, 2012, 23:28:01 »
How's the heat around the legs from the pipes?

Actually not bad at all, Still probably going to header wrap them.  The powder coat on the pipes wasnt heat rated and the left pipe is bubbling by the head.  It is running lean on left cylinder and rich on the right because of the single carb and 180 degree crankshaft. Not much else I can do other than going back to two carbs. Might end up going with a different exhaust that has mufflers.  I went into the open header idea saying that if the Harley guys all over town can do it I can do it but I think it is just too obnoxious. It is way louder in person / riding it  ;)

Offline Weezy

  • Posts: 233
  • The Impatient Perfectionist!
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #65 on: Apr 14, 2012, 17:00:36 »
Wow! Nice job.

Offline MILLENNIUM FALCON

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Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #66 on: Apr 14, 2012, 17:29:58 »
Video please! ;D  As far as the lean condition.......there are several guys on xs400.com that are running single carb setups with good results I would check that out before you switch back to 2. I looked into to it for my xs400 because my mono-shock made fitting two carbs a challenge. The bike looks great by the way.


 I went into the open header idea saying that if the Harley guys all over town can do it I can do it but I think it is just too obnoxious. It is way louder in person / riding it  ;)
[/quote]
« Last Edit: Apr 14, 2012, 17:32:10 by MILLENNIUM FALCON »

Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #67 on: Apr 20, 2012, 22:31:33 »
Video please! ;D  As far as the lean condition.......there are several guys on xs400.com that are running single carb setups with good results I would check that out before you switch back to 2. I looked into to it for my xs400 because my mono-shock made fitting two carbs a challenge. The bike looks great by the way.


 I went into the open header idea saying that if the Harley guys all over town can do it I can do it but I think it is just too obnoxious. It is way louder in person / riding it  ;)


Videos:

Walk around video

Drive by video

Offline MILLENNIUM FALCON

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Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #68 on: Apr 20, 2012, 22:53:27 »
Thanks for the videos, I posted on your other thread.  :)


quote author=riotten22 link=topic=32386.msg393847#msg393847 date=1334971893]

Videos:


Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #69 on: Apr 22, 2012, 21:54:31 »
Installed some "lollipops" in the headers and it took the bite off the sound and started the wrapping the pipes.  After they dry I will be doing the high temp silicone spray on them that should blackin them up a bit more.




Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #70 on: Apr 23, 2012, 17:21:15 »
Here are some new pics, Wrapped headers, added 2.25" side mirror and license plate. Will post updated sound clip this evening.


















Offline honda53rider

  • Posts: 251
  • 77 XS400,73 SL350, 73 RD350
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #71 on: Apr 25, 2012, 16:49:39 »
hey i might have missed this in a earlier post, but #1 how much was it to have the 2 into 1 carb boot? (if you don't mind me asking) Also what did you have to do the the carb to run a single. That looks a lot like my BS34's that came on my 77 xs400. Im having trouble with my carbs one is bad so running just one may work out for me.

And Grate Build!!
Why I wear a full faced helmet. 1. They are safer 2. Keeps the bugs out of my teeth 3. Hides my dorky smile I have because my old bike is actually on the road!

Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #72 on: Apr 25, 2012, 17:24:20 »
hey i might have missed this in a earlier post, but #1 how much was it to have the 2 into 1 carb boot? (if you don't mind me asking) Also what did you have to do the the carb to run a single. That looks a lot like my BS34's that came on my 77 xs400. Im having trouble with my carbs one is bad so running just one may work out for me.

And Grate Build!!

You are correct that is a single stock BS34 carb running a 45 pilot jet and a 145 main jet. $90 for the intake manifold, $40 for the Velocity stack (polished filter replacement), and $10 on fuel rated hose to connect the carb to the intake.  Warning: the left cylinder will run lean compared to the right cylinder if you run this setup, the XS400 uses a 180 degree crank which causes one cylinder to run lean.

Offline honda53rider

  • Posts: 251
  • 77 XS400,73 SL350, 73 RD350
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #73 on: Apr 25, 2012, 17:31:13 »
Sweet! well now i know that i have a back up plan if i can get the one carb back up and running. I have also thought about running the XS Performance Carburetor Kit from mikes XS its $300 but they would be brand new carbs and i think you get a little power boost with the flat side carbs. Well im really just waiting to get back to my bike so i can work on it. Thanks Again!
Why I wear a full faced helmet. 1. They are safer 2. Keeps the bugs out of my teeth 3. Hides my dorky smile I have because my old bike is actually on the road!

Offline riotten22

  • Posts: 162
Re: 1981 Yamaha XS 400 Special II Cafe Racer build
« Reply #74 on: May 06, 2012, 17:17:11 »
Took some of the last pics of this bike :(  Guy from Hawaii saw it on ebay and after his check clears next week it will be on a long journey to Honolulu.  Sad to see it go but I need to fund the next project / toy.