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CB250 Nighthawk Cafe Racer Build

69K views 31 replies 17 participants last post by  Alan F.  
#1 ·
Hey guys, a few weeks ago I found a decent little 91' CB250 Nighthawk on craigslist for cheap. Fairly lame bike in most aspects, but also fairly solid, so i decided to have some fun with it. Here's a play by play of the build.
Day I bought it:
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New home at the Shop:
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Seat and Fairing Removed:
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Put the Stock Seat back on and the bike already looks cooler! but no … this a build thread:
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Made a New Tail Section out of Fiberglass, Chopped the frame, and of course installed the obligatory Clubmans…:
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Quick Paint:
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Foam Seat, Metal Mesh and Lights!:
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Said 'bye bye' to those Giant Mufflers, 'Hello' to some Fork Gaiters, and placed a Sticker over the gouge I just put in the paint!:
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And Ta'da! a CB250 Nighthawk which is a bit more exciting to look at and a lot more fun to fly around the City on.

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After installing a larger main jet, and tuning the mixture screw the bike runs pretty well. A Fun little toy to fling around the streets of DC!
 
#9 ·
it looks great, now u should do the single shock conversion on it where u mount a CBR shock under the seat, add some flat sheet metal side plates to reduce wind drag (and put a race number on them) and do the kick start conversion (from a cm200) on there and itd be perfect!
 
#11 ·
I enlarged the three pics with the new mufflers and can see the fatal flaw many Rebel owners fall for: no mounts on the mufflers, which yield future broken exhaust studs on the head.
 
#15 ·
FWIW I went back and looked again just now and see the brackets hiding behind the peg mount.

Disregard.
 
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#28 ·
Unfortunately I don't have a pic handy. The battery is just secured under the seat... with that said the battery is not standard, its a tiny Ballistic Battery that's about 4"x4"x2", it only weighs 1.5lbs and can be mounted in any direction since its non-liquid.

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#17 ·
Nice work, looks really cool. Does the Nighthawk have a side stand AND center stand? Is that how all Nighthawks are? If yes, does the center stand also fit the Rebel body ? (without cut & weld necessary?)

Thanks! Tom
 
#19 ·
Chef - In The pics posted by PNBELL of his cafe conversion inside the garage, it looks like he has a center stand, that's why I asked. In outside pics only a side stand. Does anyone know for sure if that center stand will fit a Rebel body without serious retrofit? Thx! Tom
 
#21 ·
Thx Duckster.

Too bad Honda didn't consider that option in their Rebel line. It would sure make lots of maintenance chores easier to have that stability built in instead of jack stand or actual jack to get er up in the air, eh?

Tom
 
#22 ·
Securing the battery

Beautiful bike. I really like your work on this. What did you figure out for ways to secure the battery? Did you suspend it on some sort of custom frame between the bike frame bars? I am doing something similar with my nighthawk but do not have your level of fabrication expertise. I want to do this part right to protect the battery, so I would appreciate any help.
 
#23 · (Edited)
For anyone interested, here is what I did for my battery rather than putting it up in the seat: I built a wire mesh inside fender similar to Pnbell's (but probably thicker). Taking out the battery box leaves a screw hole on the right side of the frame by the wire front fender (Pnbell cut it off in the later pictures). I put a p clamp on the left side opposite the fixed screw hole and bent the sides of the stock battery support bracket to attach to these two supports. This couched the battery between the wire fender and the bracket. I also purchased a small lithium battery to reduce the weight on the wire mesh.

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The only major problem I see is that battery acid leaks could damage the drive chain.
 
#27 ·
Hey guys, thanks for all the feedback. Sorry I haven't checked back in a while, busy summer.

This bike is still very much a project, I did actually cover the seatpads in vinyl since i last posted.

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I'm happy with the result, basically everything I have done on this bike is my first experience... so its all about learning.

I'd like to actually redo the seat, and modify the gas tank to make the bike better, but these things take time I don't seem to have lately... haha

But either way the bike is really fun to ride, especially in the city, and people on the street seem to like it. Until next time, Cheers!

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#31 ·
Shouldn't be hard to mold seat to tank contour ..
you should leave a slight gap imo as it is a point of likely flex, I don't see attaching the two as practical..

Can of Denatured Alcohol to cleanup uncured or slight amounts will thin and slow resin curing..
Cured resin releases easy from Parchment Paper or water soluble products like PVA Release which can be brushed or sprayed on surfaces you don't want resin to stick to..
chopsticks for stir sticks grab a hand full next time at one of those szechuan type eateries.. Also grab some un-loaded $ gift cards as they make stiff scrapers/spreaders that the resin will shatter off of once cured allowing reuse..
3 or 5 ounce bathroom paper cups what i used for mixing small batches as you add layers

I like working with glass and resin except for the itch..
preparation is key as you only have 15 to 30 minutes working time

always been enamored by those who can form sheet metal, shrink or stretch it at will..