Friday, March 25, 2011

How to convert your CB250 to brat style

Older Model (Mid to late 70's) CB Fuel tank with left side petcock and NPT threading.

7/8" Clubman or 32mm clipon handlebars.

Cafe Seat (purchased or made)

Tail light and License Plate bracket

Bar end Mirrors (optional but adds to the look)

Two Shorty Mufflers or mufflers of your choice.

Two Vinyl Flooring Tiles (Explained Later)

Paint and Graphics if Wanted

Universal Headlight Ears (optional)

Universal Cafe 1/4 Fairing (optional)

Custom Made rearsets (Very Pricey Option)

Various Nuts, Bolts, Sheet Metal Screws and Spacers

Zip Ties

Shorty Shocks (11" Eye to Clevis)

New Chain and Sprockets of your choice (optional)

#38 Pilot Jet and a #115 Main Jet for carb

40mm Pod Filter (optional but great for rejet)

Construction paper and marker



Tools Needed:

Metric Socket Set

Metric Wrench Set

Screwdriver Set

Hack Saw (I told you we would be cutting)

Drill and bits

Sandpaper

Wire Cutters and Strippers

Motorcycle lift

Muffler Wrap (Optional)

Nerves of Steel :)



Instructions:
Start by Placing the bike on the lift and remove the Battery, handlebars, tank, seat, Plastic Body, exhaust system, turn signals, headlight and bracket (if replacing these), Rear Tire, Front and rear sprockets with chain (if replacing these), taillight, shocks, plastic fender, Carburetor and air box. With all of these removed, we can see that the potential actually is there to make this a sweet little Cafe, despite any ridicule we may have gotten.

Paint the tank and seat to desired color and graphics.

Next, cut the tail section just behind the upper shock mount weld and the front portion of the grab bar on both sides to leave a flat top frame. While we have the saw out, cut the exhaust just forward of the crossover pipe.

With the battery and air box out of the way, Use the construction paper and marker to make a template for new side covers. Place the construction paper behind the frame where the side covers are to go, and trace a line onto the paper to the shape wanted. Cut out the template, and transfer the design to the flooring tiles (told you I'd explain this). Using a box cutter, cut out the design on the flooring tile. Paint to match. Set aside for now.

Replace the front and rear sprocket (if replacing these), and reinstall the rear tire and chain. Install the 11" shocks.

Mount the new mufflers to the shortened exhaust. BTW, I painted my down tubes with high temperature exhaust paint. Replace the exhaust. Some brackets may need to be made Depending on your application so the exhaust does not rattle.

Remove the petcock from the stock tank and reinstall it on to the new tank. Slide the new tank in to place. Depending on your application, you may need to level the tank and make brackets or tie downs.

Install the Cafe Seat. Again, Depending on your application, Brackets may need to be made. (Told you this was not for the faint of heart!).

Loosen the bolts on the triple trees and push the forks up 1 1/2" to 2" making sure that they are they same level. WARNING! This will make your steering quicker and you will loose some give in you front suspension. This is necessary to level the bike after installing the shorter rear shocks. Tighten the bolts back down.

Install the new handlebars of your choice. Reroute the clutch, brake and throttle cables so that they do not bind. Install the bar end mirrors if you decided to go with this option.

If using the new headlight ears, install them on the forks but leave the a little loose for adjustments. Bolt the headlight to the ears and slide the headlight up and down the forks to the level that you want it. If installing the quarter Cafe fairing, leave room for it to clear you gauges. Install fairing.

Bolt the taillight of your choice to the tail section of the new seat and wire it up. Install turn signals in desired locations.

Install rearsets if you have them.

Rejet carburetor and reinstall. Place pod filter on carb if using this option. If not, reinstall air box.

Reinstall battery and check for power at all systems. Start the bike to ensure everything is set properly. Adjust accordingly. Zip tie anything that is hanging down (IE solenoids etc...) to the frame.

Using self drilling sheet metal screws and spacers, install the new side covers.

Another option is to relocate the battery so that it is under the hump of the new seat. This will required a base to be fabricated and welded to the frame and longer cables. If you do this, side covers are not required and gives a very clean look to the bike.

Another option is to use fuel cell foam to prevent to fuel from sloshing around in the tank. This is great for high speed turns.

Put on your best leathers and helmet, fire it up, and TON UP! Yes, with these mods, the 250 Nighthawk will do 100mph. With the new jets, air pod, more open exhaust, and different sprockets, it is more than possible. These mods removed 22lbs of weight from my bike and increased the HP to 31bhp (dynoed). Pretty trick, Huh?

Total cost of parts:

Tank: $50 - $100

Bars: $25 - $100

Seat: ? - $150 Depending on if you make or buy.

Taillight: $25 - $75 Depending on style used.

Mirrors: $25 - $150 Depending on style used.

Mufflers: $60 - $250 Depending on style used.

Flooring Tile :$1

Paint and Graphics: $25 - ? Depending on rattle can or professional and details of graphics.

Headlight Ears: $15

Fairing: $60 - $150 Depending on style used.

Rearsets: $$$$$$$$$$$$$

Shorty Shocks: $90

Chain and Sprockets: $130

Carb Jets: $7

Pod Filter: $10

Total Cost as I did mine : $668 for parts + $500 For bike = $1168.
More than half the cost of a new one, and three times as much fun!
Links for parts:

spoked wheels

spoked wheels and vintage rubber really add to the look a feel of your ride

rear bar

cool xs with custom seat bar, this would work really well on a cb as the frame lug points are quite similar

Tuesday, March 22, 2011

Nitroheads seats


The Nitro heads SR400/500 seats get used on many bike models (other than the SR4/500).   They can be adapted with some slight alterations to the mounts and use of some simple brackets. The majority of the seats made for the SR are fairly easy to adapt to bikes such as the XS650's, GB400/500, SRV250's, CB250's, 360, 500,550 etc etc & Z750 pluse many more, it won't be a direct fit of course, but it can be adapted with some work that is fairly straight forward  and simple . The most common method is to use a cross bracket which mounts to the seats fitment points. 


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Friday, March 18, 2011

I know its not a cb250 but this is cool non the less

1978 XS650 from Deus Customs on Vimeo.

A bit about the stock cb 250

Manufacturer Honda
Model year 1982–2008
Predecessor Honda CM200T Twinstar
Class Standard
Engine 234 cc (14.3 cu in) air cooled parallel twin
Power 15 kW (20 hp)
Torque 19.6 N·m (14.5 ft·lbf)
Transmission 5 speed, chain drive
Brakes Front: Disc or drum depending on market
Rear: Drum
Weight 130 kg (290 lb) (dry)
Fuel consumption 3.4 L/100 km (83 mpg-imp; 69 mpg-US) to 4.0 L/100 km (71 mpg-imp; 59 mpg-US)
Related Honda Dream CB250
CMX450 Rebel
Rebel 250


The Nighthawk 250 is a standard Honda motorcycle. It features a 234 cc (14.3 cu in) air cooled parallel twin engine. First manufactured in 1982, the motorcycle has changed little except for color.
The engine generates 15 kW (20 hp) and 19.6 N·m (14.5 ft·lbf), achieves a top speed of around 130 km/h (81 mph).It has drum brakes and spoked wheels at front and rear, though front disk brakes and alloy wheels are on Australian, U.K. and Japanese models.
The Nighthawk 250 is essentially a light, maneuverable, inexpensive, economical, and easy to maintain bike. With a dry weight of 130 kilograms (290 lb), the bike can achieve 3.4 L/100 km (83 mpg-imp; 69 mpg-US) to 4.0 L/100 km (71 mpg-imp; 59 mpg-US).[citation needed]
It is often used at Motorcycle Safety Foundation (MSF) motorcycle training. Its smaller size and lower seat make it popular for riders of smaller stature.
In contrast to the Honda Rebel 250, which offers very similar specification, the Nighthawk is considered to be an urban street-use bike, standard street motorcycle. The bike's lineage can be traced back to the Honda CM200 Twinstar of the early 1980s, bored out to its maximum capacity of 234 cc (14.3 cu in).