Official Nighthawk thread

Discussion in 'Road Warriors' started by eteller, Dec 24, 2006.

  1. Lulu7404

    Lulu7404 Been here awhile

    Joined:
    May 16, 2009
    Oddometer:
    310
    Location:
    Just north of Big D
    Very good! But I have to admit... those are also my WIFES bikes. Mine are on the other wall.. Cervelo P2C and Cannondale Rush. We both do triathlons and mtb. My first tri bike was a 650 Kestrel Airfoil. Nice bike.

    PM received and returned thanks, send pics!
  2. Mambo Dave

    Mambo Dave I demand proof, sir.

    Joined:
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    That isn't what caught my eye in that photo if we're admitting things here... but, yeah, the bicycles are pretty cool, too. :evil

    No offense intended Lulu7404 - nice catch.
  3. Lulu7404

    Lulu7404 Been here awhile

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    Just north of Big D
    Funny Mambo, the first thing she said when I was reading the posts about her bikes was "nobody said anything about me!":rofl
    She's a keeper.
    This is her real love... moto's are a recent interest because of me.

    [​IMG]
  4. Mambo Dave

    Mambo Dave I demand proof, sir.

    Joined:
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    OMG, why didn't you post that earlier?!

    Horse-girls are crazy - I suggest dumping her immediately for your own sanity.

    I'm serious.

    I'll never date another.

    Wow, and she had so much potential too... :cry

    I am so sorry for your predicament.

    :D

    (But I'm serious - I'll never date another.)
  5. Lulu7404

    Lulu7404 Been here awhile

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    Just north of Big D
    But seriously, in the almost 8 years we have been together, she has judged more than competed. I can tell you though that the "crazy" starts with the parents of them when they are little. My wife tells me stories all the time about parents griping about why their kid didn't win or whatever. BUT, horse people are a different breed for sure. Horses make me itch.
    Hijack over...

    What are some favorite tires for the little 250's?
  6. RABBIT170

    RABBIT170 CB750 Adventurer

    Joined:
    Feb 3, 2011
    Oddometer:
    111
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    Ft. Wayne, IN
    That 250 will be a fun bike, If you find yourself needing alittle more power, you can raise the needle in the carb with some washers.
  7. combatkarl2

    combatkarl2 n00b

    Joined:
    Mar 29, 2009
    Oddometer:
    6
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    SE MN
    great little bike Lulu. My wife had one for 1 1/2 yrs. Never did much for accessories accept OEM luggage rack/back rest. Also did the washer on the carb needle jet which improved starting and the lean mixture like Rabbit stated. Also improves "cold running" immensely...no need to run with choke. I'd recommend a MSF course. Sometimes my wife regrets selling the baby hawk and getting the low seat/suspension BMW f650 twin. :(::(: If you feel the need to upgrade the front drum brake, the Rebel 250 has disc brakes and is a bolt-on procedure.

    84 Nighthawk 700s
    09 BMW f650gs twin cyl
    SE MN
  8. hunter151

    hunter151 Adventurer

    Joined:
    Jul 15, 2011
    Oddometer:
    81
    I recently put some bridgestone spitfire S11 tires on my 450 nighthawk and they work great and are some of the cheapest tires available. Havent really seen any people complain about then on the internets either.
  9. Lulu7404

    Lulu7404 Been here awhile

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    Can someone please refer me to a place to get details on shimming the needle? It does run super lean, almost to the point that I thought I was going to have to take apart carb for good cleaning.
  10. Lulu7404

    Lulu7404 Been here awhile

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    MSF completed Sunday. I am also very interested in where to find the specs for the Rebel disc conversion. The brakes are ok, but I have not attempted an emergency stop situation to really test them... I also fear better brakes with the tires that are on it... I don't mind paying for good tires... This is my wife after all :wink:
    As far as getting rid of it... her dream bike (so far) is a Bonneville. She has mentioned not selling the little CB and using it with our travel trailer for vacations... light enough to throw on a bumper bike holder.
  11. drdubb

    drdubb OFWG

    Joined:
    Dec 13, 2009
    Oddometer:
    732
    Location:
    Raleigh, North Carolina

    Get #4 washers from radio shack. Remove the tank. Take off the top of the carbs - careful with the diaphram. Remove the diaphram and slide by sticking a finger in the slide and pulling gently. Remove the needle from the diaphram. (thumb wheel looking piece in the slide) place a washer under the head and reassemble. (make sure that the diaphram is aligned properly) Might be a good time to replace the cover screws with SS. I was able to do this w/o removing the carbs from the bike.
  12. Lulu7404

    Lulu7404 Been here awhile

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    Thx Dale.
    #4 washer was what I was looking for... I am familiar with the process on Suzuki's Mikuni carbs from my two GS's.

    :beer
  13. Lulu7404

    Lulu7404 Been here awhile

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    Again, if has been posted, just a hint on where to look, I am slowly getting through this thread from the beginning.
    Has anyone increased the front fork spring rate? It seems a bit soft and reading the manual didn't indicate fork oil.
    Anyone change out the sprockets, whether rear or counter sprocket for better low or higher speed performance?
    Does the needle shim provide enough given the bikes intended purpose? Not looking for a speed demon but sometimes the stock bits don't keep the motor in a happy place.

    Thx
  14. combatkarl2

    combatkarl2 n00b

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    SE MN
    the carb shim doesn't increase power but did make it much easier to accelerate smoothly. No more cold/lean start and stopping, over-revving, or playing with the choke.

    Rebel brake conversion...there are some threads on a yahoo group for the CB250 nighthawk group. You can search the threads without being a member, but will need to be a member to see photos of what it looks like. Looks fairly involved, but doable. Lots of searching for the right parts. Once in the group search for "harolds 250" or "front end swap." These should get you close.

    I'd agree w/ keeping the bike even she gets something else. Fun, light, little machine.
  15. RABBIT170

    RABBIT170 CB750 Adventurer

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    After you tank the tank off, you will want to remove the rectifier mount plate too, this will allow you reach the screws for the top of the carb, along with the two holes in the frame.
  16. RABBIT170

    RABBIT170 CB750 Adventurer

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    I plan to change out the rear sprocket soon with a 32 Tooth, stock is 33.
    Here are some links to help you.

    http://autos.groups.yahoo.com/group/CB250_Nighthawk/message/3818

    http://www.ebay.com/itm/Sunstar-32t...2452&pt=Motorcycles_Parts_Accessories&vxp=mtr
  17. RABBIT170

    RABBIT170 CB750 Adventurer

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    Also you can replace the stock 194 speedo gauge light bulb with a T10 LED, really looks good.
    And superbrightLEDs.com sells a motorcycle LED brake light that is brighter than the stock bulb.
  18. CLINTIRD

    CLINTIRD Adventurer

    Joined:
    Apr 22, 2011
    Oddometer:
    59
    Location:
    Costa Mesa, CA
    So this last weekend I proceeded with a little work on the Nighthawk. I changed the sprockets to 17t front and 39t rear and installed a D.I.D. x-ring chain. Had Bridgestone BT45 tires mounted and balanced front & rear. Once I got the bike rolling I took it to my local shop to have the master link pressed on. They took it for a spin when they were done and noticed the master cylinder was messed up and very dangerous (it hadn't felt right to me, but it's how it has always been). SO...I had them rebuild it and the caliper and all is well. The front brake is so much nicer now. Got it back home, swapped the bars with Protaper SE ATV High bars...AMAZING!!! Installed a MRA windshield and replaced the plugs with some fresh NGK's. I didn't change out the brake pads / shoes, the bike has 8500 miles on it and there is plenty of meat left on them, so I saved the EBC pads & shoes for a later date. I zipped the bike up and down the street but didn't have a chance to really ride it until yesterday. Put 110 miles on it and it feels like a different bike. The BT45 smooth the ride out a ton and make the bike handle great. And the ATV bars are very comforable. I had a lot of fun in the process. :clap Thanks for the tips.
  19. DOD

    DOD idiot dirt rider

    Joined:
    Aug 1, 2005
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    2,557
    Location:
    Phoenix
    I'm a new Nighthawk owner more by accident than choice. A friend of a friend is moving and asked me to haul away his old bike. Here it is, a 1983 Nighthawk 550.

    So, now what? Is this thing worth restoring? I know very little about these bikes. I'm more comfortable on orange bikes with knobbies.

    [​IMG]

    [​IMG]

    [​IMG]

    This could be a fun project.


    -dod
  20. RABBIT170

    RABBIT170 CB750 Adventurer

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    Link to the bars?