Author Topic: New Project  (Read 4733 times)

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lukedeisel

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New Project
« on: December 09, 2008, 06:11:25 PM »
I have not posted around here yet. I have just been lurking.
We have designed a kit to adapt any 2000-2004 gsxr ( or any 2002 and up Suzuki SV) front end to any cb750 using the stock bearings. This bike is the guinea pig/ business card for that kit. It will also be my personal ride for the summer. 
Here are some pictures of this new project.








(the chrome rim is just for the mock up)

The front end conversion is done. We machined a new stem out of chromoly and pressed the stem into the lower triple.

To get the stack-up correct, a nut was machined to space out everything the right amount.






The rear end is off of a Suzuki Bandit 600. Let me know what you guys think!

Offline my78k

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Re: New Project
« Reply #1 on: December 09, 2008, 06:32:01 PM »
WOW! Very cool indeed!

Altho it is funny how out of place that seat looks now...

Dennis

Offline KB02

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Re: New Project
« Reply #2 on: December 10, 2008, 04:47:24 AM »
Looking good so far. Are you planning on running a monoshock, or will you using the stock (style) dual shocks?
1978 CB750K Project
2000 Ducati ST2
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Offline andy750

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Re: New Project
« Reply #3 on: December 10, 2008, 04:56:24 AM »
Wow very nice work! Looking good. Curious to see how it turns out.

Good luck
Andy
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Offline volkswagendan

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Re: New Project
« Reply #4 on: December 10, 2008, 05:47:37 AM »
SICK! i cant wait to see more of this bike.
don't take me too seriously.

lukedeisel

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Re: New Project
« Reply #5 on: December 10, 2008, 07:04:30 AM »
I will be running dual shocks. I'm waiting for the shocks I ordered to come in. As soon as they do I will make mounts.

Offline J.Webster Designs

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Re: New Project
« Reply #6 on: December 10, 2008, 07:37:03 AM »
looks good. I will be following this as i want to do a similar project on my CB750.
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Offline DarkRider

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Re: New Project
« Reply #7 on: December 10, 2008, 10:23:14 AM »
looks good. I will be following this as i want to do a similar project on my CB750.

I was gonna suggest that you check this thread out since that will take care of the tree swapping issues if he can mod a tree for you then its a matter of getting GSXR forks and the HD hub.
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Offline DollarBill

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Re: New Project
« Reply #8 on: December 10, 2008, 10:52:47 AM »
Hey lukedeisel,

This looks cool!  Any idea on when a kit will be available and details about what would be included?  How close is the gxsr axle and spacing to a CB750 stock wheel?

I love the look of those forks...
1975 CB750F Project Yellow Jacket - CBR600rr Swinger GSXR 600 Forks
1955 BMW R25/3, 1966 Honda CA160, 1975 CB400f, 1975 CB550, 1976 CB550

Offline BlindJoe

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Re: New Project
« Reply #9 on: December 10, 2008, 11:33:35 AM »
looks good. I will be following this as i want to do a similar project on my CB750.

I was gonna suggest that you check this thread out since that will take care of the tree swapping issues if he can mod a tree for you then its a matter of getting GSXR forks and the HD hub.

FunJimmy has a fork (R6 i think) kit for sale.

lukedeisel

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Re: New Project
« Reply #10 on: December 10, 2008, 12:07:40 PM »
Dollarbill,

I am not sure how the cb750 stock wheel would fit in those forks. I have always liked the look of mags. I was looking at Squirley's build though and he seems to have done it without much trouble.

Included in the kit is the stem and spacer essentially. The lower triple could also be included if you sent it to me (a core). It all depends on what forks you want to run (inverted, standard, off what bike etc.). If you want USD forks, I have a triple here that we could use.

It takes about 3 hours to machine the stem and spacer, plus the cost of material. It will probably cost around $200.00. If I get more than a few orders, the process will be standardized and they'll cost about $150.00. If a lot of orders for this sort of thing start coming in, the cost would again come down even more; to say $100.00. The best bet for anyone I think is to try and get a "group buy" together, as it would be substantially cheaper.

I don't know what funjimmy's kit is, or how much he charges, but I am confident that this is the safest, most simple, and hopefully most economical way of getting a front end that is a precision fit. Just as if it came from the factory. 

Offline DollarBill

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Re: New Project
« Reply #11 on: December 10, 2008, 12:53:33 PM »
I'm actually going to put five star Nighthawk mags on my bike and was just wondering about the axle and wheel because I know the stock setup is fairly close to the Nighthawk.  Would one need a particular gsxr set of forks i.e. 600 750 1000?  I like the USD look the best.

So let me see if I got this right...the gsxr forks fit the upper CB750 triple with no modifications and the lower gsxr triple just needs a new stem and spacer to fit?
1975 CB750F Project Yellow Jacket - CBR600rr Swinger GSXR 600 Forks
1955 BMW R25/3, 1966 Honda CA160, 1975 CB400f, 1975 CB550, 1976 CB550

Offline DarkRider

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Re: New Project
« Reply #12 on: December 10, 2008, 01:29:47 PM »
Squirley used a Harley Davidson hub that matched up well with the GSXR parts. I believe the GSXR rotor had to be redrilled at its mounting point but its been awhile since i have read that part.

And no you need the GSXR upper and lower triple tree. He only needs the lower to remove the stem and install the new one in.
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Quote from: heffay
so, you say just tie myself on with this... and steer w/ this?   ;D ;D  ok.  where's my goggles?   8)

Offline J.Webster Designs

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Re: New Project
« Reply #13 on: December 10, 2008, 01:36:41 PM »
yeah thats what squirley did. new bearings in the harley hub... shimmed top bearing for the steering neck. anyone know the benefits of an R1 and GSXR front end other than ease of installment? handling, brakeing, lower unsprung weight......
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Offline DarkRider

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Re: New Project
« Reply #14 on: December 10, 2008, 02:44:59 PM »
All of the above. Especially when combined with the wheels allowing a wider selection of tires normally reserved for Supersport bikes being able to be used on your CB. When used with the GSXR wheels and the full braking system you will have the same Stopping power as a GSXR.
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'73 MGB Roadster
'69 Ford F250

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Quote from: heffay
so, you say just tie myself on with this... and steer w/ this?   ;D ;D  ok.  where's my goggles?   8)

Offline J.Webster Designs

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Re: New Project
« Reply #15 on: December 10, 2008, 03:28:39 PM »
well what i was asking is if there was a benefit of the R1 forks over the GSXR forks or vise versa. I know that the above statements apply to the swap. but i am trying to figure out if one fork and complete front end (brakes, etc..) is superior to the other.
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lukedeisel

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Re: New Project
« Reply #16 on: December 10, 2008, 04:55:45 PM »
I think "superior" is relative in this scenario. Both suspensions are light-years ahead of the stock CB stuff. Also, both braking systems are more than enough for any CB. It all boils down to look and/or preference. There is a lot of interchangeability with the Suzuki stuff. A variety of years and styles will fit. Any 2000-2004 Suzuki front end will fit this stem. This includes the Hayabusa. For SV650-1000 models, anything 2002 and later will fit.

Offline J.Webster Designs

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Re: New Project
« Reply #17 on: December 10, 2008, 04:59:32 PM »
thanks. im going to dive into it a little more and see what i come up with. I agree with the braking.
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Offline DollarBill

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Re: New Project
« Reply #18 on: December 11, 2008, 07:09:45 AM »
lukedeisel, which front end are you using...600, 1000?  Do you know if there is a difference because I might have a line on a 600 front end?
1975 CB750F Project Yellow Jacket - CBR600rr Swinger GSXR 600 Forks
1955 BMW R25/3, 1966 Honda CA160, 1975 CB400f, 1975 CB550, 1976 CB550

Offline FunJimmy

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Re: New Project
« Reply #19 on: December 11, 2008, 07:40:24 AM »
That new steer tube is an awesome piece of machining and clearly the best way to convert modern forks to fit our old bikes.

When selecting a donor front end, consideration should be given to the offset of the triple trees.
This is the one specification that will change the geometry and handling of your bike.

There are several modern forks to select from and the closer you get to the factory CB offset the better.

Everyone considering this modification should read and fully understand the following article.

http://www.american-v.co.uk/technical/handling/geometry/body.html

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lukedeisel

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Re: New Project
« Reply #20 on: December 11, 2008, 09:15:45 AM »
The front end I am using is from a 2002 1000.

Offline DollarBill

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Re: New Project
« Reply #21 on: December 11, 2008, 09:23:12 AM »
Any idea how similar they are to a 600?
1975 CB750F Project Yellow Jacket - CBR600rr Swinger GSXR 600 Forks
1955 BMW R25/3, 1966 Honda CA160, 1975 CB400f, 1975 CB550, 1976 CB550

Offline KB02

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Re: New Project
« Reply #22 on: December 11, 2008, 03:10:38 PM »
Everyone considering this modification should read and fully understand the following article.

http://www.american-v.co.uk/technical/handling/geometry/body.html

Interesting article. I wouldn't say that it's the end-all-be-all article on suspension geometery (and neither does the author) but it gives a good overview and some ideas to chew on.
1978 CB750K Project
2000 Ducati ST2
...and a pedal bike

Join the AMA today!!

My project thread Part I: K8 Project "Parts Bike"
My project thread Part II: Finishing (yeah, right) touches on Project "Parts Bike"

Offline DollarBill

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Re: New Project
« Reply #23 on: January 11, 2009, 02:17:54 PM »
Hey Luke,

Any progress on your bike?
1975 CB750F Project Yellow Jacket - CBR600rr Swinger GSXR 600 Forks
1955 BMW R25/3, 1966 Honda CA160, 1975 CB400f, 1975 CB550, 1976 CB550

Offline fastbroshi

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Re: New Project
« Reply #24 on: January 14, 2009, 11:35:59 AM »
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