Project: Reincarnation: cb750 wrecked to modern suspension and fuel injection

freerideordie

freerideordie

Active Member
So late last fall I stayed late at work, when I finally decided I should head home, some guy decides he's going to run a red light and ruin my day (and my baby). But it could have been waaaay worse. Long story short I was awarded $10,000 for my bike and Pain and suffering. Sort of a mixed blessing. I was/am currently moving into and remodeling my new house so obviously I cannot go outright and drop ten grand on the bike....gotta get things like t.v., flooring etc. I have set aside a good sum and thought I may as well make a build thread this time around.

how she was before...
300.jpg


wreck
wreck1.jpg

wreck2.jpg


other than a few scrapes and a couple of weeks of being sore this is all i got
ouch.jpg


Over the winter I got my dream garage set up and have been stewing on the direction I want to take this bike. Then I figured "why the hell not make it way faster and handle way better? Ive decided to just suck it up and stray somewhat from a classic look, and put modern forks on it and monoshock it. As far as the the engine goes....Going to take it to 850cc and FUEL INJECT IT! I currently have the cases split for cleaning/rebuild and Glyptol. Ill be posting those progress pics soon.

Forks from 2008 Hayabusa, figured that since our bikes are so heavy I would get the fork from one of the heavier/heaviest modern sportbikes....Oh yea and its black and gold which matches my scheme
forks.jpg

So far I don't see what all the fuss is about putting these puppies on. Actually its ALMOST bolt on....Hayabusa stem is about .5" shorter than the cb750 stem, so I ordered a slightly narrower bearing for the top of the triple tree and well mill the inside cup down ever so slightly. As far as the axle/wheel goes.. the wheel from a harley dynaglide (40 spoke 19x2.5") takes a busa wheel bearing perfectly...thus taking the axle..will probably just have to make spacers .....again will post pics soon.
wheel
56bdab6d.jpg



So here is a tentative rendering which I am sure will change throughout but you get the idea.
cb750monoshock.jpg


more to come later this week
 
Glad you walked away!


I'm sure you know this, but double and then triple check the frame to make sure it's straight.


That looks like a fair amount of force was exerted on the forks, and the steering stem could well be tweaked.


The plan for the rebuild looks awesome!


What kind of injection solution are you looking at?


Best of luck!
 
Thanks Guys.
Bozz, not even thinking of using that same frame, several welds were cracked and it would probably just ride around in a circle....good friend of mine had and extra one laying around that is straight....but i will definitely double check that one for straightness. As far as that fuel injection goes, I will be using a microsquirt controller with gsxr throttle bodies. Ive read that some guys will also use cbr bodies, but i think the gxsr ones will look sleeker and be an easier fit.
 
Alright so I got the a little bit done this weekend on the bike. But i got a little sidetracked and decided that I needed a sandblaster, so I built one. I know I could have gone over to Harbor Freight and bought one for ~$300 but that one is too small, and besides it was an excuse to work something new. It is 2'x4' at the base and i made it large enough to fit the frame in. That think on the front is the filter and sure makes sand and soda keep flowing much better. Also put some extra halogen lights i had left over from the wet bar project as well as a vacuum port on the side.

sandblaster.jpg


Blasted and Glyptal'd the cases.

casesglyptal.jpg


Also, there is not much better than getting to watch anything to do with bikes while you are workin on em.

garage.jpg
 
don't know what i like more: the plans for the bike, or the garage set up.

i'll be keeping a close eye though as im doing a mono and gsxr 1000 front end on a 79 kz650
 
freerideordie said:
So far I don't see what all the fuss is about putting these puppies on. Actually its ALMOST bolt on....Hayabusa stem is about .5" shorter than the cb750 stem, so I ordered a slightly narrower bearing for the top of the triple tree and well mill the inside cup down ever so slightly. As far as the axle/wheel goes.. the wheel from a harley dynaglide (40 spoke 19x2.5") takes a busa wheel bearing perfectly...thus taking the axle..will probably just have to make spacers .....again will post pics soon.
Click to expand...

Probably made in the same Japanese factory.
 
Yeah, I am really happy with how the garage turned out. Honestly it was the very first thing I did when I moved in, which of course didn't make sense to the lady, but she understands it's my therapy-zone. The floors were a B*tch to do but soooo worth it. Everything wipes up very easily and its much easier to find thngs you drop. The tv is pretty unnecessary, but it was a christmas gift so I cant complain.

May as well show it off a bit, here it is as i was getting close to finishing it,

3adaf9b2.jpg


these gladiator wall rails are awesome, but expensive...but occasionally lowes has a sale on them and you can get 4' sections for $5 a piece.

aedb9d5c.jpg


The "pegboard" i have is from Wall control and it is the Bee's knees, its steel and has both traditional holes and slots for their specialty stuff. A bit pricey but comes with a ton of extra stuff, ordered it from sears, check it out.

[http://www.sears.com/shc/s/p_10153_12605_00917003000P?prdNo=14&blockNo=14&blockType=G14]
 
Alright, made a little progress over the past week. Got the forks and wheel mounted up, cut the frame in half, welded the rear shock mount on, etc.

so adapting my frame to fit the forks was the easiest way to go. The steering stem of the busa forks was about half an inch shorter than cbs. Meaning it did come all of the way through the stem and you could get the top triple on, there just weren't enough threads showing for the stem nutto feel safe. So I took my dremel, yea my dremel, and put the depth fence on there and shaved off a bit of this lip:
3f4a599d.jpg


The dremel actually worked amazing and it looks as though its been milled out. It is a constant depth all of the way around as I made sure to measure very frequently. I forgot to take a pic before i put the race in but even with the race in you can see how much lower it is,
162192a9.jpg


gotta have a grinding pic
64beaa2f.jpg


shock mount welded in. 1/4" plate base 5"x3", and two 1/4" tabs for the shock. You can also see I've got the slugs in the frame for the new upper tubes.
1992ef7d.jpg


ba66a2d5.jpg


Ive since got the shock mounted and last night, and bent some tubing (with my teeth), for the shock mount on the swinger. will post more tomorrow
 
Thinking to the future...has anyone had any luck with modifying the alternator from a more modern bike to be used on a cb?
 
Just as a safety check...if you pull the caps off the top of the Busa fork and let the forks completely bottom out, will the 19" wheel/tire combo hit the bottom tree?

ba66a2d5.jpg
 
Classy machine. I'm a little ticked that I never saw it on the streets of Tulsa before that happened. Needless to say, that's a story to tell your grand kids! 10 large is a great budget to start with. Who needs home renovation, when you have a garage like that?
 
The forks could come down a bit in case I want to put a fender on it. But as it sits, they come about a half inch from hitting when bottomed out.... Thanks for bringing it up adrian
 
Been a while, been remodeling the house and trying to knock out the hardtail first. finished the mono shock swingarm a while ago, thought I'd get an update in,

5e09acbb.jpg
 
?????? there are no bars or clipons on her, that's a mock up of the rear subframe, that is, if you are talking about the to long tubes out the back? they will be cut down much shorter and get supports later on.
Butttttttttt, I like where your heads at, just strap on some skis or rollerblades....Maybe even a chariot, and just let the bike be my pony pulling me through town.
 
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