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Author Topic: boosted cb550 bobber bike build  (Read 4231 times)

swansmaa

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boosted cb550 bobber bike build
« on: August 18, 2013, 10:33:29 PM »

scored a rough old bike a wile back, and now im getting around to building something out of it. Its a 1975 honda cb550. The plan is to build a hardtail bobber, thats boosted with a draw through single carb setup.



 got it stripped down and chopped up the frame a little


start of building the intake. making 1 of 2 flanges


made the intake collector. turned out alright


intake flanges


mmmmm pie


2 runners done. chop saw and angle grinder got a good workout


better shot of the collector. cut the pieces with a cutoff wheel and mig'ed em up


this is all the progress for now, gotta get some more steel tomorrow.









« Last Edit: August 18, 2013, 10:43:50 PM by swansmaa »
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Ntrain2k

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Re: boosted cb550 bobber bike build
« Reply #1 on: August 19, 2013, 03:35:49 AM »

Well done!
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92CXyD

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Re: boosted cb550 bobber bike build
« Reply #2 on: August 19, 2013, 06:12:00 AM »

Looking forward to progress on this build.

Well balance pr0n with turbo bike build.  :noel: :noel: :noel:

dvst8r

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Re: boosted cb550 bobber bike build
« Reply #3 on: August 19, 2013, 07:41:22 AM »

I approve this message.
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PhilStubbs

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Re: boosted cb550 bobber bike build
« Reply #4 on: August 19, 2013, 09:07:02 AM »

Text book newb post.




Reported
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obd1>all

 fucking box started smoking and i saw a flame start up so i grabbed a bucket of water and splashed it on the breaker box.

crxvtec91

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Re: boosted cb550 bobber bike build
« Reply #5 on: August 19, 2013, 09:47:06 AM »

Well done

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ratcityrex

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Re: boosted cb550 bobber bike build
« Reply #6 on: August 19, 2013, 11:47:50 AM »

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New setup is old bottom end with a hype r head with gsr cams. built lsv with hx35 @ 26psi on pump gas
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #7 on: August 22, 2013, 11:31:04 AM »

made a little more progress. bike is a roller now and I finished tacking up the other 2 intake runners. Also threw a 30mm mikuni on it
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carkrazed

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Re: boosted cb550 bobber bike build
« Reply #8 on: August 22, 2013, 06:48:31 PM »

CB's are narly. Likin this build  :noel:
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #9 on: September 26, 2013, 12:01:21 PM »

made a little progress. built a more direct exhaust header, got the oil feed/return plumbed up, and the intake mani is off for powdercoat right now. also just won these little guys to let her breathe. 40mm flatslides (i only need one of them) 29.50 shipped  :Jew:
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jabberwock

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Re: boosted cb550 bobber bike build
« Reply #10 on: September 26, 2013, 02:27:33 PM »

You may want roundslide.  Flats are more likely to get stuck open when breathed on.  Give the flat a shot though, something to think about if it sticks.
« Last Edit: September 26, 2013, 02:32:57 PM by jabberwock »
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #11 on: September 26, 2013, 04:22:35 PM »

You may want roundslide.  Flats are more likely to get stuck open when breathed on.  Give the flat a shot though, something to think about if it sticks.

ahh thanks for the heads up. i think ive got a pair of 38mm round slides that i can swap if its an issue.
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rawr

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Re: boosted cb550 bobber bike build
« Reply #12 on: September 26, 2013, 07:17:10 PM »

I like the way bobbers look, but I wouldn't fucking ride one.



Do a wheelie
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #13 on: September 30, 2013, 09:38:11 PM »

got the carbs in the mail today, and my buddy finished up powder coating the intake so i made a little progress.

new megaphone/log style header is all welded up, painted with high temp black, and wrapped in header wrap. Forgot to take pics while building it, but im happy with how it turned out.


got a buddy to machine me a steel oil galley plug with the metric male threads and an 1/8" pipe thread tapped into it. Much stronger than drilling/tapping the hollow aluminum plug. The T fitting feeds the turbo oil inlet and an oil psi gauge.


Intake is powdered high temp black and bolted up to the cylinder head.


new carb: gotta make a couple slight mods but it should work out well. 40mm flatslide mikuni, with plenty of main jets/ pilots/needles available thanks to the snowmobile world.


got a few more things to give some attention to, and i'll be pretty close to seeing if it will run.
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PhilStubbs

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Re: boosted cb550 bobber bike build
« Reply #14 on: October 01, 2013, 06:09:53 AM »

Does that turbo have the proper seals(the actual name is escaping me currently) for a draw through setup or is this a "fuck the man" situation and just see what happens? I'm curious on the results either way. I have a cb750 that needs boost
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obd1>all

 fucking box started smoking and i saw a flame start up so i grabbed a bucket of water and splashed it on the breaker box.

92CXyD

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Re: boosted cb550 bobber bike build
« Reply #15 on: October 01, 2013, 06:50:00 AM »

Awesome the picture of the powder coated intake looks like some one MS painted it in.

Looking at the turbo manifold, does the rider have enough room for his legs to not get burnt?

In this pict:

The header looks to extend past the frame a bit.


Liken' this build, major Props.  :noel:

PhilStubbs

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Re: boosted cb550 bobber bike build
« Reply #16 on: October 01, 2013, 06:57:15 AM »

With all of my miles of Harley riding with exhaust between your leg and engine, I think he will be fine
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obd1>all

 fucking box started smoking and i saw a flame start up so i grabbed a bucket of water and splashed it on the breaker box.

swansmaa

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Re: boosted cb550 bobber bike build
« Reply #17 on: October 01, 2013, 11:06:35 AM »

Does that turbo have the proper seals
nope.

or is this a "fuck the man" situation and just see what happens?
exactly.

Looking at the turbo manifold, does the rider have enough room for his legs to not get burnt?
it will probably be a little close, but shouldnt be a deal breaker. i'll probably get a couple burns and then learn to avoid it.
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PhilStubbs

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Re: boosted cb550 bobber bike build
« Reply #18 on: October 01, 2013, 12:06:40 PM »

Does that turbo have the proper seals
nope.

or is this a "fuck the man" situation and just see what happens?
exactly.


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obd1>all

 fucking box started smoking and i saw a flame start up so i grabbed a bucket of water and splashed it on the breaker box.

swansmaa

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Re: boosted cb550 bobber bike build
« Reply #19 on: October 02, 2013, 12:03:59 PM »

got the downpipe welded up. just needs a few little things and ill be close to making some noise hopefully


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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #20 on: October 02, 2013, 10:45:43 PM »

fucker runs. havent touched the jetting or anything yet, but it runs.
Cb550 turbo


yes. i know the vid. is shitty quality and sideways. heres some redheads to make up for it.




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PhilStubbs

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Re: boosted cb550 bobber bike build
« Reply #21 on: October 03, 2013, 04:40:04 AM »

Badass, I need to start on my 750 now.
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obd1>all

 fucking box started smoking and i saw a flame start up so i grabbed a bucket of water and splashed it on the breaker box.

turbohf

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Re: boosted cb550 bobber bike build
« Reply #22 on: October 03, 2013, 06:07:30 AM »

gas tank looks road worthy.  O0
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #23 on: January 17, 2016, 01:46:09 PM »

https://www.youtube.com/watch?v=CaVHN-DM6GQ

well I haven't quite forgotten about this project, been fucking with it a little lately. got quite a few more things done, and im working on jetting. I can turn the fuel screw all the way in on the 40mm flatslide mikuni, and it does not stall out at idle. This should mean the pilot circuit is too rich. Stock pilot jet was a 17.5. I tried a 15 and a 12.5 today and they have the same results. I just ordered a size 10 pilot jet, and it looks like thats the smallest size offered. What do I do if idle is still too rich with a size 10 pilot? Am I doing something wrong?
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ratcityrex

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Re: boosted cb550 bobber bike build
« Reply #24 on: January 18, 2016, 10:05:03 AM »

What do I do if idle is still too rich with a size 10 pilot?

More boost!!
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New setup is old bottom end with a hype r head with gsr cams. built lsv with hx35 @ 26psi on pump gas
LEED tuned! 434hp/329tq http://www.youtube.com/watch?v=_pbDXZxZdZs
http://www.realhomemadeturbo.com/forum/index.php/topic,16195.0.html

Old Setup B18a1 296hp/289tq LEED Tuned 20psi on pump! http://www.youtube.com/watch?v=2Yj-Z90j4W4 
http://www.realhomemadeturbo.com/forum/index.php/topic,205.msg2437.html#msg2437

Random Hero

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Re: boosted cb550 bobber bike build
« Reply #25 on: January 18, 2016, 05:17:32 PM »

https://www.youtube.com/watch?v=CaVHN-DM6GQ

well I haven't quite forgotten about this project, been fucking with it a little lately. got quite a few more things done, and im working on jetting. I can turn the fuel screw all the way in on the 40mm flatslide mikuni, and it does not stall out at idle. This should mean the pilot circuit is too rich. Stock pilot jet was a 17.5. I tried a 15 and a 12.5 today and they have the same results. I just ordered a size 10 pilot jet, and it looks like thats the smallest size offered. What do I do if idle is still too rich with a size 10 pilot? Am I doing something wrong?

You may have the slide idle stop screw set to high/far in and it might not be using just the pilot jet anymore. try moving the center needle in further (c clip up 1 notch)

swansmaa

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Re: boosted cb550 bobber bike build
« Reply #26 on: January 18, 2016, 08:58:51 PM »

You may have the slide idle stop screw set to high/far in and it might not be using just the pilot jet anymore. try moving the center needle in further (c clip up 1 notch)

I have gotten the same response from others now, and this is making sense. If I drop the slide anymore it dies. Heres a video of what I can currently get for an idle:
https://www.youtube.com/watch?v=UkLiAaB0auw
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #27 on: May 21, 2017, 11:22:24 AM »

well she's a runner. revs to a healthy 12+ grand and makes a good 14psi of boost once you're up there. starts boosting good after 7k. Bout 100 miles on it so far, starts and runs great but still has room to lean down the main jet a couple sizes.

https://drive.google.com/open?id=0B0tuIVPtbJTgUUNWSzJ0ZUJsclE
« Last Edit: May 21, 2017, 11:28:05 AM by swansmaa »
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swansmaa

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Re: boosted cb550 bobber bike build
« Reply #28 on: May 21, 2017, 11:23:49 AM »

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rawr

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Re: boosted cb550 bobber bike build
« Reply #29 on: May 21, 2017, 02:55:41 PM »

rad as fuck i'd ride it.
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