1991 Nighthawk 750 cafe/brat build

F

fatfurious2

New Member
FYI, this might be a lengthy thread. Im going to take my time on this build, and learn as much as I can. The info for these bikes are not as plenty as others..
This was my previous cafe. 1974 Honda CL/CB 350. I got impatient too quickly and sold this within 3 months.



I am about to start on my build. I picked up a non-running 1992 750 with 48k miles, for $800 and got it running the same day. Turns out it was a clogged air filter. It runs fine now, with no filter, but its only been 2 days. Ive been searching and found out that pods are no good. I want to run velocity stacks (with screens) and a 4-1 exhaust. The builds for these bikes are few, but some have attempted and succeeded. I just found out that the Walking Dead bike is also a 97 CB750. My plan is to model from that and a cafe build I saw. I plan to add a kicked up hoop, velocity stacks,, 4-1exhaust, upgraded forks (not sure which ones yet.. depends on budget and availability), and possibly a longer (or aluminum) rear swingarm. Im thinking about the XS650 tank or a CB400, and will go the POR 15 kit if needed on the tank..

Anyways, here is my project. So far, Ive just removed the plastics and turn signals.. havent attempted the tank yet.. but I dont think it will be difficult.
 
Re: 1992 Nighthawk 750 cafe/brat build

not much progress recently. Havent even chopped the rear frame yet. But soon.. Hoop will be ordered and velocity stacks ( Mikuni KRS-002).

In other news, I picked up this front end. 05/06 GSXR1000. Going to order fork conversion bearings, from allballsracing.com
 
Re: 1992 Nighthawk 750 cafe/brat build

made some more progress.
Removed stock front end:


Test fitted GSXR1000 front end:


I will need to swap the steering stems, as the GSXR one is not long enough. Also this front end just dropped stance down more. Still need to test fit the exhaust to see if it will work. Hopefully!
 
12/16 update:
ordered new steering stem bearings. Will update again when they have been mounted. As of now, this is how it sits, currently a roller
 
Watching this....good start. Will the front drop affect the handling much? What's your plan for wheels? Velocity stacks on CV carbs? How will they work when pods won't?

I've just decided to retain the stock airbox on my CBX550 with CV carbs as the hassle factor is too high to be bothered.

Carry on.... :)
 
Ive decided to go with pods. From my research, stacks are much harder to tune. Id like to do them one day..

For the wheels, for now, going to stick with the gsxr front, and stock rear. I will be putting on some Kenda Big Block knobbies to improve the looks.

I assume the handling will be affected. Hopefully not by too much.
 
fatfurious2 said:
Ive decided to go with pods. From my research, stacks are much harder to tune. Id like to do them one day..

For the wheels, for now, going to stick with the gsxr front, and stock rear. I will be putting on some Kenda Big Block knobbies to improve the looks.

I assume the handling will be affected. Hopefully not by too much.
Click to expand...
From WHAT research? Internet cruisin?

Believe it or not, some people have physically tried these things.

CV's need an airbox to perform properly.

Pods, Velocity stacks, which is harder to tune? Whichever one you choose.

Gonna be doing a lot of off roading with our nighthawk are we? No? Then why are we putting off road tires on it?

Bout as usefull as all the jacked up big offroad tired trucks all these small time contractors think they need.

But it LOOKS cool.
 
fatfurious2 said:
Ive decided to go with pods. From my research, stacks are much harder to tune. Id like to do them one day..

For the wheels, for now, going to stick with the gsxr front, and stock rear. I will be putting on some Kenda Big Block knobbies to improve the looks.

I assume the handling will be affected. Hopefully not by too much.
Click to expand...

I've seen a re-jetting/upgrade kit on ebay, Sigma I think, that states it will improve performance when running with pods. Tell them how you want the bike to run and they'll provide the jetting.

I've just stuck MEFO Supersport chunky tyres on the CBX Comstar rims for the look. Although, the retailers do use Mefo on their venture bikes and rate them. We'll see.

PS: I think your thread is on the wrong section...cafe racer is not what you are building, you'll get flamed in here FF2.
 
NoRiders said:
I've seen a re-jetting/upgrade kit on ebay, Sigma I think, that states it will improve performance when running with pods.
Click to expand...
Of course performance with pods will improve with a jet kit, but you will not improve on the stock performance or driveability on most bikes (especially DOHC hondas) when using pods on cv's.

NoRiders said:
Tell them how you want the bike to run and they'll provide the jetting.
Click to expand...
This statement could not be more misleading.
 
DohcBikes said:
This statement could not be more misleading.
Click to expand...

"Tell them how you want the bike to run and they'll provide the jetting. "

I stated that ^^ as I read this on the 6Sigma website:
Why a 6Sigma Jet Kit:
- Installing a 6Sigma Jet Kit in your carb is the best way to get the maximum performance and longest life out of your ride.
- 6Sigma Jet Kits are the only custom engineered jet kits produced. Each individual design is based on your year, model, altitude and modifications.

I have no direct experience of these kits, so just making the o/p aware there was, at least, something out there claiming to do the job if the airfilter is removed.
What's your experience of 6Sigma kits DOHC?
 
DohcBikes said:
From WHAT research? Internet cruisin?

Believe it or not, some people have physically tried these things.

CV's need an airbox to perform properly.

Pods, Velocity stacks, which is harder to tune? Whichever one you choose.

Gonna be doing a lot of off roading with our nighthawk are we? No? Then why are we putting off road tires on it?

Bout as usefull as all the jacked up big offroad tired trucks all these small time contractors think they need.

But it LOOKS cool.
Click to expand...

So whats your problem? A man does whatever he wants with his ride.
Besides, all my cv carbs work perfectly. Theys gots pods bro!
Not gonna comment on knobbies on sportbikes though..! :D
 
NoRiders said:
I've seen a re-jetting/upgrade kit on ebay, Sigma I think, that states it will improve performance when running with pods. Tell them how you want the bike to run and they'll provide the jetting.

I've just stuck MEFO Supersport chunky tyres on the CBX Comstar rims for the look. Although, the retailers do use Mefo on their venture bikes and rate them. We'll see.

PS: I think your thread is on the wrong section...cafe racer is not what you are building, you'll get flamed in here FF2.
Click to expand...
So they give you a choice? Like - How do you want your bike to run?
A: ok
B: bad
C: worse
:D

Cv carbs need an even (laminar) flow and negative pressure on the airbox side to function, thats the main thing. Ignore resonating volume and tuned intake tracts unless you go for max hp.
But really, they go better with an airbox. Just remove factory baffles and such.
 
datadavid said:
So whats your problem? A man does whatever he wants with his ride.
Click to expand...
Commonly mistaken to have a problem. No problem here. I'm just fine.

Never did I or would I tell someone what to do. I'm just telling him what will happen if he does. It will be a bike built for looks instead of performance. As somebody who has done both, I am here on the forum to offer my opinions for pondering.

A man delivers his opinion however he chooses.

Your response to noriders was exactly what i was thinking. I'm not even fired up enough to explain myself on the sigma kit. Ho hum.
 
DohcBikes said:
Commonly mistaken to have a problem. No problem here. I'm just fine.

Never did I or would I tell someone what to do. I'm just telling him what will happen if he does. It will be a bike built for looks instead of performance. As somebody who has done both, I am here on the forum to offer my opinions for pondering.

A man delivers his opinion however he chooses.

Your response to noriders was exactly what i was thinking. I'm not even fired up enough to explain myself on the sigma kit. Ho hum.
Click to expand...
I just wanna see more retardation on the roads, would be a pity if you put off everyone who wants to go offroading with sportsbikes and get wet muck in the billet velocity stacks!
 
datadavid said:
I just wanna see more retardation on the roads, would be a pity if you put off everyone who wants to go offroading with sportsbikes and get wet muck in the billet velocity stacks!
Click to expand...
Sarcasmeter: Recalculating...........................
 
datadavid said:
So whats your problem? A man does whatever he wants with his ride.
Besides, all my cv carbs work perfectly. Theys gots pods bro!
Not gonna comment on knobbies on sportbikes though..! :D
Click to expand...
Do you have a dyno sheet showing the bike running on the airbox and then another showing it making more power with the pods? I'd bet money you don't. Most people who make this kind of statement have never ridden a bike that was running "perfectly". In most cases their bikes ran poorly and after fucking with jetting the pods for hours to get it to where it is "reasonable" in their mind and running better than before. I bet I could take your "perfectly" running bike on pods and get more power and overall performance than you had with the pods.
 
o1marc said:
Do you have a dyno sheet showing the bike running on the airbox and then another showing it making more power with the pods? I'd bet money you don't. Most people who make this kind of statement have never ridden a bike that was running "perfectly". In most cases their bikes ran poorly and after fucking with jetting the pods for hours to get it to where it is "reasonable" in their mind and running better than before. I bet I could take your "perfectly" running bike on pods and get more power and overall performance than you had with the pods.
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You know you would have better luck building your own airbox rather than hacking in the triumph legend airbox that these carbs came from.
Would kind of ruin my build as well
I think it must have been very restricted since it had 90 mains and im running 140 now and its pulling a lot harder than the stock 750 i had with no noticeable dip in power across the range, so its not worse than stock at least. But its all talk without comparing dyno runs i guess, so now i'm gonna have to make an airbox just to prove you right..?
Nah, the look of three oval k&n's beats the small loss of horsepower i think.
 
Due to the relentless carping about pods being shit from well meaning types on here, I have actually decided to run the stock airbox and filter on my CBX, so there.

There's the same going on in the VW aircooled world as well.
 
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