Topic: extreme modification

[Bob550four]

has anyone ever considered completely redoing the back of a CB, doing away with the twin shocks for a monoshock swingarm, and putting a completely different subframe to something like a CBR 900 or something on it instead?   I know its a ton of work, and money to do, but just wondering if anyone ever considered it?

[crazypj]

I've done a CB400f, wasn't too bad (as long as you can weld, and machine bushings)
PJ

[FunJimmy]

Bob

Just bite the bullet and buy yourself that nice new CBR1000RR.

You need it! 

[KB02]

just do a search for "Monoshock." You should find a bunch of posts about people either doing it or thinking about it.

[754]

Fun Jimmy, but then he would be down to..

Cant you tell which is mine.. I have that anodized blue m/c covers, and gold colored handlebar fasteners & custom risers!! What do you mean it does not stand out in the crowd?? its personalized

 Whhoo Hooo!!

Actually I am all for folks modding their own rides.. like the old days.. dare to be different..  at least try it..you may suck at it, and it may not be for YOU.. but you wont know if you dont try!! And at least you will be respected for trying..

There is more quick help out there now than ever..

[andy750]

This guy has done it....apparently he is from Greece....check out Carpys website and his "Readers rides" section - more pics of engine there....







cheers
Andy

[FunJimmy]

Actually I am all for folks modding their own rides.. like the old days.. dare to be different..  at least try it..you may suck at it, and it may not be for YOU.. but you wont know if you dont try!! And at least you will be respected for trying..

754

You know I'm into the mod thing too. Just stiring the pot a bit.

That CB550 with the single side swingarm is SWEET!

Cheers
FJ

[James]

Like mine? 

[Gregorymoto]

Nice

[James]

At the request of Pablo, more pictures of mine (the bike I mean - the girl I wish! )
Sorry for the blurry first image.....well you can see why

See the tshirt?

[Bob550four]

Is that a VFR tail section?  looks beautiful on there. 

[mgmuellner]

Wait, there is a bike in that pic too 

[andy750]

Man I love those boots shes wearing....one of my ex-s used to wear the same ones...thanks for posting! Great shots!! (oh yeah and super-cool bike as well  ).

cheers
Andy

[James]

She left a stocking mark on the tank .......(did I just say that out loud?)

The bike was abit of a dog when I got it, I let it get a bit more doggy for a while ( I was into the rat look then), and then decided to rebuild the motor, which led to the thing being stripped and rebuilt as you see it now.

CB550K engine and cradle.
Custom subframe.
Replica Ducati 916 tail
VFR 750 rear end
GSXR400SP front end
CBX550 tank
CBR rearsets, predator exhaust with 'shorty' exhaust

I've swapped the back end for a VFR400 since then (issues with rear sprocket size) and have a wheel set up where I can have interchangeable vfr400, vfr750 and a Honda Bros wheel, but that is on hold at the moment, I'm trying to progress my cafe, rewire a Z650, re-engine a GPz750 all of which need to be done yesterday.

Sorry for hijacking the thread.

[SoyBoySigh]

This kinda stuff makes me wanna graft the ass end of a SOHC four onto the frame of a CBR, and the front fenders, wire wheels, fork shrouds from a 350, etc etc. Cause the "under-tail eliminator" crap just RUINS the lines of these cool, classic bikes. If you're gonna stick some bodywork of that TYPE onto a sohc bike, then build it around the stock sub-frame, or most of the stock sub-frame. 'Cause these later era bits are waaaay disproportionate to the older frames and engines. They're made to suit the wide-assed fairings of the newer delta-box framed, waaay over-square fours with the water-cooling channels all around the heads. Easily double the size they oughtta be. Just my oh-so-humble opinion.

-S.

[lucky]

I do not know why anyone would want to do this modification.
It makes no sense.

The stock shocks distribute the load evenly on each side of the frame.
Each shock only taking part of the load equally.
With the mono shock you are focusing all of the load at one point and creating great twisting forces especially with a single sided swing arm.
The twin shock system is so much easier to work on and you can replace one shock while the opposite shock keeps the bike from collapsing onto the rear wheel or smashing you hands etc.,.

IF you do decide to install a mono shock system you will need to make some changes to the 33 year old .060 thousandths thickness tubing frame.
You will need to weld some flanges to create an arch between one side of the frame and the other side. Then move the battery and all electrics.

 I know you are going to want to get the exhaust to come up and out of the ass end of the bike and then you will have to make all of the changes to protect the wiring ,seat, and electronics from getting hot. Hopefully you wont cross the exhaust over the sides of the carbs creating  fire hazard and have to add asbestos wrapped sheet metal to keep the gas in the carbs from boiling.

You want a modern sport bike design and it has lots of problems.
A real nightmare to work on.

Just go buy one of those new sport bikes and you get mono shock, exhaust, out the rear end up high, aluminum frame, transformer toy plastics and anodized everything. Gas tank up high, passenger way up high in the rear,etc.,.LOL...lol

Why try to make one thing into something else?
If you want to do that just start building a frame from scratch.

[lucky]

This guy has done it....apparently he is from Greece....check out Carpys website and his "Readers rides" section - more pics of engine there....



cheers
Andy

Check out all that modern stuff and then look at the SU style carb!!!

[754]

 Lucky we do it becausae we can, and some of us make a living at it (maybe that should read.. USED to make a living.. at it..
 What exactly is wriong with an SU?

[Lostboy Steve]

To me this defeats the whole purpose of owning an early model sport-bike. Honestly, no matter what you do these bikes still aren't going to be anywhere near modern sport-bikes in power, weight, or handling. I appreciate the amount of work and fabbing that goes into this and again it is a cool looking bike, but its just not for me. Then-again I don't understand stretched out zx-14 or busa's either. I like custom stuff I really do, but these old bikes are awesome in their stock form, or lightly modified. Also, they handle pretty damn good with the stock suspension and newer tires.

[nayto550]

A Ducati swingarm and a... a supercharger?  Sweet.

This guy has done it....apparently he is from Greece....check out Carpys website and his "Readers rides" section - more pics of engine there....

[lucky]

Lucky we do it becausae we can, and some of us make a living at it (maybe that should read.. USED to make a living.. at it..
 What exactly is wriong with an SU?

Nothing wrong with an SU if it is brand new. I would replace SU's with a Mikuni in a heartbeat.

[metalhead0283]

i bought a 05 cbr600rr swingarm with that pro-link monoshock setup...i was gonna put it on a xs650 but after getting my 76 cb550 i may put it on that instead seems were im gonna cafe it anyways

[Rigid]

Money and time boys if you got it rock on. The bike is a different story.

[crazypj]

I do not know why anyone would want to do this modification.
It makes no sense.

The stock shocks distribute the load evenly on each side of the frame.
Each shock only taking part of the load equally.
With the mono shock you are focusing all of the load at one point and creating great twisting forces especially with a single sided swing arm.
The twin shock system is so much easier to work on and you can replace one shock while the opposite shock keeps the bike from collapsing onto the rear wheel or smashing you hands etc.,.

IF you do decide to install a mono shock system you will need to make some changes to the 33 year old .060

I do not know why anyone would want to do this modification.
It makes no sense.

The stock shocks distribute the load evenly on each side of the frame.
Each shock only taking part of the load equally.
With the mono shock you are focusing all of the load at one point and creating great twisting forces especially with a single sided swing arm.
The twin shock system is so much easier to work on and you can replace one shock while the opposite shock keeps the bike from collapsing onto the rear wheel or smashing you hands etc.,.

IF you do decide to install a mono shock system you will need to make some changes to the 33 year old .060 thousandths thickness tubing frame.

Do you have the faintest idea what your talking about?
mono shock will feed lads directly to strongest part of frame with far less bracing than a twin shock.
Stock 750 shocks are pretty crap, most aftermarket not much better until you get into high end stuff
Stock, you have rear suspension loads going into a cantilever (rear frame ) then bits of bent tubes trying to hold things in line
It's fine if you potter about, but, anyone who rides a 'vintage SOHC bike even moderately hard knows just how much they flex