Author Topic: project 71 cb750 with 330 wheel convertion  (Read 53686 times)

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631girl

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project 71 cb750 with 330 wheel convertion
« on: January 02, 2010, 03:27:54 PM »




« Last Edit: January 24, 2010, 08:20:00 PM by bam631 »

Offline kslrr

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #1 on: January 02, 2010, 04:17:05 PM »
Interesting.  Are those propane tanks functioning as the bikes oil tank?  Or are those NOS tanks?

And Welcome to you and your husband.
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Offline kslrr

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #2 on: January 02, 2010, 04:37:16 PM »
Wow, some collection of 750's.  Get him to post some pics please :).  So, did YOU join the site or did he?

Oops, beet me to it with the pic.
Now  1972 CB350FX (experimental v2.0)
        1981 CB650c Custom with '79 engine (wifes)
        1981 CB650 engine
        2004 HD XL883C Custom
        1977 Yamaha XS750D (in progress)
Then 1972 CL175
        1964 Yamaha YGS-1T
No ride is a Bad ride

Offline Zaipai

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #3 on: January 02, 2010, 04:41:17 PM »
That bike is sick (in a good way) on so many levels.. Love the pictures.. Nice work..
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Offline Hush

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #4 on: January 02, 2010, 05:19:10 PM »
Lucky man, we like ladies who dig these old bikes. ;)
I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline bgfootball67

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #5 on: January 02, 2010, 06:06:32 PM »
Nice bike, I would have guessed the propane tanks were being used for air ride?  Is he using an air ride set up with that huge back tire?  Is your husband gonna punch out the engine a bit to compensate for the jackshaft?  Can not wait to see this one finished, different and cool!
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Offline Ecosse

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #6 on: January 02, 2010, 09:41:48 PM »
that bike is nuts!

welcome the both of you!
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wtfitscarter

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #7 on: January 02, 2010, 09:52:39 PM »
I think the tire is way to small... :) just kidding.. I can't wait to see that thing complete!

Offline Zaipai

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #8 on: January 17, 2010, 04:45:38 PM »
Wow looks like you have it figured out, have you tried it with the frame raised and lowed ?
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Offline Toxic

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #9 on: January 17, 2010, 05:04:08 PM »
Your Husband as a very unique vision of what he wants to create.  I don't think I've ever seen anything quite like it, at least not on this board. 

He must have some serious fabricating skills.

Please post more pics as the build developes.

Do you  mean to have it ready for Daytona 2010 or Daytona 2011?

That's a pretty big project to complete for 2010.

Offline Achmed

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #10 on: January 17, 2010, 05:04:43 PM »
Pardon my ignorance, but how does the rear suspension work? Air ride? Are there tanks or something? And where does it actually support the bike?

Offline Zaipai

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #11 on: January 17, 2010, 06:18:12 PM »
I am really watching this thread with great interest I all ways loved the 3.30 tires on HD's but never really thought about it much on a CB so this will be cool to watch it sure is a great thread build so far.. And I agree your hubby has some good fab chops for sure.. I also figure its probably a ways off on riding but was just more thinking if it worked on the stand or not and if the chain went really slack in the down position..

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Offline MickeyX

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #12 on: January 17, 2010, 09:15:01 PM »
Though I applaud his thinking outside of the box on this build, is it just me catching some really big, bad things about to happen here? Look closely. It's right there. I hope it goes well and that I'm wrong on this but, looking at the angles of the shots taken, there is something really glaring out at me in an engineering way. I'm walking away from this thread. I can't watch. Sorry.  :(
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Offline seaweb11

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #13 on: January 17, 2010, 09:43:39 PM »
Looks like the chain has a small sprocket to allow chain to roll over yes?

Offline ev0lve

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #14 on: January 18, 2010, 01:08:02 AM »
Eh, don't run away that fast. It's so over the top I can't even imagine what made you want to do it on a CB750 frame but post as you make progress

Personally I'm more interested in the forks than the craziness going on at the swingarm so if you want to expound on that... ;D


Offline KB02

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #15 on: January 18, 2010, 05:13:07 AM »
Damn why are all you people being so damn hard on this guy and his wife about this build?  If you guys don't chill a bit you are going to run them off the board, I for one would like to see the finished project rollin.  I understand your guys concern about the safety of his bike, you are not being forced to ride it are you?  Once you state your concern move on if you do not like it...  Isn't this board a place to come to show off your SOHC creation and get help from the masses for any questions you may have??? 

Why the slam about oil also?  I have owned a bikes that took damn near six quarts of oil, each bike is different.  If you do not have the manuals, you have to start somewhere.

Love the body dropped trucks, nice work.  Please do not let a few of our rude members run you guys off. 

+1  I like the rear of the bike. It's different. And it involves a heck of a lot more engineering than I am capable of.  ;D
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Offline mystic_1

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #16 on: January 18, 2010, 07:29:57 AM »
I'm wondering about the location of that tensioner, under driving conditions the engine pulls on the top run of the chain, won't this cause the tensioner to compress fully and stay there?  Every other final drive tensioner I've seen has been on the bottom run of the chain.

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Offline JS550

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #17 on: January 18, 2010, 09:04:31 AM »
I hope it works out. I can see the air ride cylinder, so why is there a question of it sitting on the ground? Once that fills it lifts the bike up, and will tension the chain, thus lifting off the ground and seat off the tire. Although, I thought the tensioner should be on the top of the top run? Maybe not, never did it myself? But seen em on some choppers like that. And honestly, I could give a sh!t about his safety! I wanna see him ride it. Let his wife worry about his safety! ;D
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Offline Zaipai

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #18 on: January 18, 2010, 09:49:48 AM »
I hope you do a video I would like to see it running. Personally I like the wide tire look (like the ones on CycleX) and I would have been disappointed if you had left the stock forks on the front, the ones you choose seem beefy and balance the front and the back out. As for the tubes used for the rear tire, I really don't see why those would not work perfectly fine. I am not an engineer however I seen thinner tubes hold up really well.

Please don't stop posting here, I really would like to see the build when its completed and painted all nice and shiny..

Thanks,
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Offline bgfootball67

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #19 on: January 18, 2010, 10:15:58 AM »
I think it is bad a**!  For all of you with nothing good to say about this build thread act like adults and go away.  If you do not have anything positive to say keep it to yourself...  I am shocked that you guys are acting like such DAMN idiots.  I guess I have been lucky to have nothing but positive experience here or I would not spend my time reading everyones information.

I do have a question, are the pipes welded together and braced off the frame for when it hits the ground (parked) or are you making pucks for it to sit on.
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Offline Industrial Cafe

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #20 on: January 18, 2010, 12:20:56 PM »
HERRUMPH! all this chicanery on the thread!!  :D

I had a question, those 600 forks, why didn't you chose a heavier bike like the 1000?
  are the springs up front soft? they look compressed about half way down.
you could always swap out the gsxr600 cartridges for some ohlins off a 1000, they are very stiff comparatively.

also, I wanted to ask how you fit the gsxr stem into the 750 neck. it's .65in shorter than the original.
It looks like you haven't finished that part up, I see the nut is barely catching the threads.

,Brian
« Last Edit: January 18, 2010, 09:35:51 PM by Industrial Cafe »
everything I say is pure speculation and
I have no idea what I'm talking about  ._.


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Offline Frankenkit

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #21 on: January 18, 2010, 05:35:27 PM »
we're just curious about how he's going to make some of these things work, like what kind of swingarm bushings he used and how he bushed the reinforced conduit to the 750 frame.  Why he used a gixxer 600 fork instead of a 1000, when a 600 fork is made for a 350# bike and a 750 is closer to 500#... How he made the gixxer fork fit in the first place.  I want to know how he revamped his gearbox and transmission to adjust for the massive increase in rear wheel/sprocket size and what speeds he's anticipating with the change, if the modification doesn't toast the tranny in the first place.

  What's the swingarm travel allowed and what's the worst-case-scenario if it bottoms?  How did he improve on the heavy, outmoded '70s design of the framework?  How much clearance does he have between the gixxer front wheel and the headers?  How does that change when the air shock is pumped up?  What's the end result geometry; will it corner safely?  How does one fill the propane tank oil bags?  Will the design constrict oil flow and starve the engine?

There's a difference between all the Craigslist Throwtogethers we've all bought from previous owners and carefully designed and fabricated machines, that's all.  All these things get taken into account.  There are a lot of real artists on this board.  IC's gixxer front end is a work of art.  It flows so well it looks like original equipment.  

The projects we see on here, everyone will do their own thing and explain exactly how they did it to others so it can be questioned, pondered or repeated.  We like the technical details, it's what a lot of us are all about.

I think the problem some of us had was that he didn't come on saying "This is what I want to do- how do you recommend I go about it?"  We would've all been keen to help. Instead he started off by being defensive, then started calling people douches etc.  Not cool. I'm waiting, as well, to see a video of this thing in action.  I'm curious, now, and would like to have these first impressions proven wrong.
« Last Edit: January 18, 2010, 05:37:49 PM by Kit »
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Offline Zaipai

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #22 on: January 18, 2010, 06:15:45 PM »
The tiles going off in a diff direction could be normal its an out side patio and they could be going around the patio doors, the swing arm is constant in that there is one on each side and it would stop after the tire.. I guess I am missing it.. but its ok. I will wait and see what develops.. It would not be the first time I missed some thing obvious..

No biggie..

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Offline mystic_1

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #23 on: January 18, 2010, 06:43:54 PM »
Grout lines look consistent to me.  Circled item doesn't appear to be a grout line.

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Offline ev0lve

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Re: my husbands project 71 cb750 with 330 wheel
« Reply #24 on: January 18, 2010, 08:10:21 PM »
Just to keep us all entertained - there seems to be exactly one other person on the internets crazed enough to try this, minus the air ride, on a 650 Nighthawk

eljugodelavida1983 - we salute you, your crappy cameraphone videos and your huge balls!

Is the whole thing easier to do with shaft drive than trying to offset the sprocket 15 inches? Inquiring minds want to know...