84 CB700SC: Retro bike project

[spacetiger]

I'm about 1/3 the way through this project.  I thought I share some of the info in case it can help someone else.  I glean tips from various sites, so when I found this site and its various member projects, I thought I'd join and start the mining.

Here are some of the details on my bike:  1984 CB700SC
Goal:  Update the bike with modern brake and handling (suspension) changes but make the changes look factory.

Changes:
Handling
 - wheels:  2010 Honda NT700V.  They match up to the left side shaft/final drive and put 17" wheels front and back.    
 - tires:  Michelin Pilot 3 so I have modern radial tires
 - front forks: 2001 VTR1100 Superhawk fork lowers, custom length 41mm stanchions (OEM 39mm stanchions are really long) with 1996 VFR750 cartridges so I have preload and rebound adjustment
 - rear shocks: 1999 Kawasaki (KYB) KZX1100 shocks, 4 levels of rebound and compression damping
 
Brakes
 - front:  2003 VTR1100 Superhawk 4 pot fixed calipers, custom spacers, 316mm ST1100 discs with ebc pads coming.  SS brakelines front and rear.
 - rear: 2001 Triumph TROPHY 1200 rear caliper and axle bracket on CBR1100XX Blackbird rear 256mm disc

I'm currently sorting out the suspension to get the rake and trail right.  Then, on to the cosmetic changes.

Jerry

Here is a pic about a month ago.


 
 

[TOOLS1]

I'm waiting.
TOOLS

[shinyribs]

TOOLS1 wrote

I'm waiting.
TOOLS

Me too!  


Did I see this bike on customfighters?

[Rich Ard]

Maybe my favorite fairing...digging it so far, can't wait to see more!

[spacetiger]

I did sign into customfighters looking for help dialing in the front forks since they put together from different bikes + that site deals with that kind of project.  Turns out they are not that into fine tuning of cartridge suspensions (my observations).  I got some help from the VFR web site, but in the end, I had to work it out on my own.  Took a while, past math classes came in handy.

Jerry

[shinyribs]

Ah,I thought that bike looked familiar. Pretty unique rig you got there bud. Hard to miss

[seestheday]

Are those gsxr carbs?  What did you use to get boots to line up right?

[spacetiger]

seestheday,

The carbs are stock.  If I every mess with the carbs, it will be to replace them with a EFI setup.  For now, it is just the suspension and brakes + some cosmetics.

The last few weeks, I have been working on dialing in the rake and trail.  The stock values are 30 degrees and 4.8 inches.  There are 2010 cruiser bikes that better than  that, so I needed to do something about lowering the values.  Because the rear KYB shocks are 0.563" shorter, it made the numbers worse (rake was a tad over 32 degrees).  To fix it, I had to relocate the lower shock mounts ~ 2 inches forward.   To do this, I swapped out the final drive to a 1987 VT700 one with relocated shock mounts.  I sacrificed a PC800 swing arm and cut and weld the lower shock mount on the other side.  I slide the forks up 0.5 inches and remeasured the values:  24.7 degrees and trail of 4.0 inches.  Now with the modern radial tires, suspension and brakes, the bike should be a fun ride....

Jerry

[seestheday]

Interesting. I asked because they look very different from the dohc CB750 carbs. Are they still keihins?

[spacetiger]

34mm keihins; could it be the [fake] velocity stacks that are throwing you off?

The stacks are factory parts; part of the hot rod look Honda was looking for.

Jerry

[seestheday]

No it was the tops that are throwing me. Maybe I'm not seeing them right but they look significantly shorter than all of the other dohc carbs I've seen.

Sent from my BlackBerry device

From: spacetiger [via Honda CB750'S]

Sent: Sunday, January 6, 2013 7:49 PM

To: seestheday

Subject: Re: 84 CB700SC: Retro bike project

34mm keihins; could it be the [fake] velocity stacks that are throwing you off?

The stacks are factory parts; part of the hot rod look Honda was looking for.

Jerry

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[spacetiger]

Got the bike together this evening.  Things completed today:

1.  CBR600 F2 speedbox adjusted so it can mate up the NT700V front wheel (NT700V wheel set up for electronic pickup not mechanical drive).
2.  Painted discs, caliper offset brackets, and speedbox.
3.  Put stock turn signals back on but swapped to clear lens with yellow bulbs

See is ready to go for a ride tomorrow.

Jerry

[shultz_1978]

Very nice looking bike.

[Hoosier Daddy]

Your subtle changes are really adding up. Front end looks amaizing!

[spacetiger]

Thanks guys.

A several few small changes and more riding since the last post.  Only the top case and seat recovering to go...



Jerry

[easyrider12]

Sharp looking bike there spacetiger!  I notice you don't have any snowdrifts in your background photos like some of us.   Maybe you could post a few ride photos to get the northerners drooling a little more.  cheers

[spacetiger]

Riding pics coming.  

IN this set, I modified (slightly) a 750 Shadow rack and bolted it straight to the grab rail.  This allows mounting the top case adapter plate... then the top case goes on.  I can officially haul "stuff" around, so the bike isn't a play toy anymore

Also tried another set of grips, will see how they work out as the old blue ones were getting old.

Jerry

[shultz_1978]

Spacetiger that bike still loks good even with the tank. Very clean looking.

[shinyribs]

I love the chin spoiler on that bike.Is that stock?

Chin spoiler???Is that what they are called on bikes?

[spacetiger]

Thanks shultz_1978

shinyribs, The chin spoiler is not stock but is close to the original.  It from a stock mid to late 80's Kawasaki GPZ750 part.  Honda factory parts are hard to come by so I jumped on it when it came up on eBay for only $75.  I had to trim it a bit so I'm sure there are 20 pissed of Kawasaki fans out there - so don't tell anyone.

Jerry