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'82 cb650sc project

Posted: Sun Oct 28, 2018 10:05 am
by kerryb
Hi, new here, new bike. '82 650sc going for the "cafe lite" treatment for the first time around. The plan is to minimize the cruiser look with changes to tank, seat, and handlebars, without compromising the stock frame yet. Having some difficulty researching which tanks might fit. The stock tank from my '78 cb750 is too narrow at the mounting pockets, as are all the vintage beemer tanks I saw yesterday. I read somewhere that a gt380 tank from suzuki is a good choice. Can anyone suggest another choice that will fit without modifying the tank?
Pics to follow.

Re: '82 cb650sc project

Posted: Sun Oct 28, 2018 3:37 pm
by kerryb
Here are the promised pictures...as we got it and initial mockup of possibilities. the mocked up tank and seat are borrowed from an on-going cb750 project, so they are for visualization purposes. Plans also include handlebars in a clip-on position or a modified set of clubmans. Headlight and gauges would be lowered and gauges would be from an earlier decade so they would be separate from the idiot lights which would be a row of led's

comments welcome.

Re: '82 cb650sc project

Posted: Sat Nov 03, 2018 2:03 pm
by kerryb
Over 100 views...and not one comment? You are too polite or I'm on the wrong forum.

Re: '82 cb650sc project

Posted: Mon Nov 12, 2018 11:00 pm
by kerryb
Peg mount

Re: '82 cb650sc project

Posted: Tue Nov 13, 2018 12:28 am
by kerryb
Gauge mount, white face clocks from cb750

Re: '82 cb650sc project

Posted: Tue Nov 13, 2018 10:56 pm
by kerryb
Is this hump too big and wide?
IMG_4436small.jpg
café seat
IMG_4436small.jpg (98.39 KiB) Viewed 24901 times

Re: '82 cb650sc project

Posted: Wed Nov 14, 2018 5:22 am
by Volker_P
It looks not bad at the first pictures but at the last picture the width looks quite much.
Might be just a camera focal width/perspective issue however.

Re: '82 cb650sc project

Posted: Wed Nov 14, 2018 2:38 pm
by kerryb
no, it's not the camera angle. This seat was made to use the stock seat pan on a '78 cb750k to retain the seat hinges and latch. I have some other ideas that will be much smaller. will post pics later.
Another question that crosses my mind is whether there is value to having a rear inner fender to protect the back of the motor and the under seat area. I'm thinking a small fender, tight to the wheel, mounted to the swingarm would be less intrusive to the look we are after. opinions or comments welcome. The fender would most likely be made of fiberglass to hug the rear tire.

Re: '82 cb650sc project

Posted: Wed Nov 14, 2018 2:45 pm
by kerryb
Maybe like this?

Re: '82 cb650sc project

Posted: Fri Nov 16, 2018 5:48 am
by Volker_P
kerryb wrote: Another question that crosses my mind is whether there is value to having a rear inner fender to protect the back of the motor and the under seat area.

If you are not going to keep the stock airbox (most cafe builds imply pod filters, so I simply assume yours, too) a fender is probably a quite good idea.

Re: '82 cb650sc project

Posted: Fri Nov 16, 2018 9:18 am
by kerryb
Oh yeah, that!...I'm not going with PODS, been there, struggled with that when the PO originally got the bike. It ran so much better with the pods removed and a stock air box reinstalled. I'm going to keep the portion of the air box that contains the carb boots. The air filter section will be reworked to house a flat style filter, hidden under the seat in a horizontal position. I don't mind carb work, but a proper air box seems to have the best all-round performance, so we are keeping that. working on mockups, no pics yet.

I do have a pic of a little more refinement of the footpeg adapter.

Re: '82 cb650sc project

Posted: Wed Nov 21, 2018 2:28 am
by Volker_P
The RC08/SC is probably the most far off starting point for a CB650 cafe like project due to the frame, instrument box, handlebar mounts, footpeg alumina and some other stuff.
But by that:
kerryb wrote:Oh yeah, that!...I'm not going with PODS, been there, struggled with that when the PO originally got the bike. It ran so much better with the pods removed and a stock air box reinstalled. I'm going to keep the portion of the air box that contains the carb boots.

you probably spend less time and nerves than someone who tries something similar with a '79 and pods! :lol:

So you have to consider where to place the airbox opening and you probably can find a place/angle where a rear fender is not necessary. There are several reports here that even the air filter cover makes a difference at least for the piston carbs. Probably not relevant for the CV carbs but better avoid to have air pressed into the airbox at high speeds (like "ram air") because all stock CB650's seem to be already on the lean side. So you won't like to shift it even further to the lean side when it runs hot and at high revs on the highway.

Re: '82 cb650sc project

Posted: Wed Nov 21, 2018 1:08 pm
by kerryb
I have cleaned enough crud off the inside of fenders to make me want to avoid having to clean the same crud off the underside of everything else in that area. A minimal fender mounted to the swingarm seems like a good idea to me. Also giving major thought to changing the frame area under the seat. A pair of straight rails with an upswept hoop would solve a lot of headaches and curvy parts. stay tuned for future developments.

Re: '82 cb650sc project

Posted: Sat Nov 24, 2018 6:53 am
by GeorgeSweety
kerryb wrote:I have cleaned enough crud off the inside of fenders to make me want to avoid having to clean the same crud off the underside of everything else in that area. A minimal fender mounted to the swingarm seems like a good idea to me. Also giving major thought to changing the frame area under the seat. A pair of straight rails with an upswept hoop would solve a lot of headaches and curvy parts. stay tuned for future developments.


If you no longer need the side panels and they are for sale I would be interested. :D

Re: '82 cb650sc project

Posted: Mon Nov 26, 2018 9:36 pm
by kerryb
[/quote]

If you no longer need the side panels and they are for sale I would be interested. :D[/quote]

Duly noted... I'll take some pictures for you and we'll discuss them.

So I dropprd off my plans and tubing to replace the seat area of the frame. Once I have this mod done we can begin fabrication of the custom airbox inlet and electrics placement.