NX250 Thread -- official ADV owners manual

Discussion in 'Thumpers' started by valvecrusher, Mar 17, 2008.

  1. Honda Scoot

    Honda Scoot My First Gold Chain

    Joined:
    Sep 24, 2008
    Oddometer:
    408
    Location:
    Sebring Ohio
    Check rear axle to swing arm pivot distance - both sides
    http://www.youtube.com/watch?v=4Dw2RZlUoUY

    No broken / bent / loose spokes?
    Rims in good condition?
    Wheels were trued?
    Tires not cupped?
    Tires / wheels balanced?
    Caliper aligned to the rotor? (not dragging)
    Wheel and swing arm bearings with out side play?
    Front forks straight?
    Fork internals and oil the same on both sides?
    Front forks in the triple trees the same distance per each side?
    Triple tree bearings adjusted?
    Fork brace in place?
    No loose fasteners?

    Use a string and tape to check alignment of the front and rear tires / wheels.
    Loop the string around the tires below the axles and fasten in place with tape. Look down the left edge - then the right edge. The string should look the same from side to side.

    Pulling a frame straight takes real effort with long pipes, wood shims, chains, extra people, trial and error, and real patience.
  2. muzcuk

    muzcuk Adventurer

    Joined:
    Aug 3, 2011
    Oddometer:
    62
    Thanks a lot for the response. I erased the ones I checked. Here are the remaining ones.

    No broken / bent / loose spokes? Tires / wheels balanced? - There is one loose spoke on rear, front was tuned somewhat recently. I honestly don't know how to handle rims. I had someone tune the front because I got it from a parts bike, I never touched the rear. I have brand new trailwings installed.

    Fork internals and oil the same on both sides? -- same oil, but springs were mix and match from 2 different bikes. I think this might be my best bet. Brand new progressives cost around 120$, but are they worth the money if the frame is bent?

    Triple tree bearings adjusted? -- What adjustment? I put in new stem bearings but I made no adjustments.

    Fork brace in place? - There is supposed to be a fork brace? I'll work on that but I doubt that it is the issue here. Missing it should decrease stiffness but should not introduce bias, AFAIK.

    Use a string and tape to check alignment of the front and rear tires / wheels.
    Loop the string around the tires below the axles and fasten in place with tape. Look down the left edge - then the right edge. The string should look the same from side to side. -- I understand these are two lines from outside of front axle to the outside of rear axle, right? If not I don't get it. I will try it ASAP.

    I was hoping it would turn out to be the rear axle misalignment but it was not. Out of curiosity, any attempt at straightening the frame would require stripping it, right?

    And I do have a visible dent on the frame. It looks as if someone was riding the bike without a the fuel tank and it fell on its left. I was hoping it was a minor thing. I will take a picture.
  3. PTC

    PTC Turd polisher

    Joined:
    Nov 20, 2008
    Oddometer:
    316
    Location:
    masshole mofo

    vvvcopy, paste in google vvv
    Learn Simple Motorcycle Wheel Alignment - Motorcyclist Online

    hondascoots got my back on this one. or i got his, whatever...thats my first guess.
    if your in new england let me know
  4. Honda Scoot

    Honda Scoot My First Gold Chain

    Joined:
    Sep 24, 2008
    Oddometer:
    408
    Location:
    Sebring Ohio
    Triple tree bearings adjusted? -- Not loose or to tight

    Fork brace in place? - There is supposed to be a fork brace? I'll work on that but I doubt that it is the issue here. Missing it should decrease stiffness but should not introduce bias, AFAIK. Agreed

    Out of curiosity, any attempt at straightening the frame would require stripping it, right? Yes

    The engine should hold the front section of the frame in place. I left a road at 70 mph and rag dolled into the woods. Everything was bent except the front of the frame, again held in place by the engine.
    Removed most items from the frame except the engine and pushed, pulled, coaxed, and hammered it straight. Not fast or easy but anything can be fixed if enough effort and money are applied.
  5. Local Machine

    Local Machine Adventurer

    Joined:
    Mar 23, 2011
    Oddometer:
    74
    Location:
    Globe Trotter
    Changing the fork tree bearing w/o changin the two base rings that sandwitch this thing together often causes the bike to pull sideways.
    Just sayin
  6. muzcuk

    muzcuk Adventurer

    Joined:
    Aug 3, 2011
    Oddometer:
    62
    The rubber dust seals were replaced along with the steering bearings, if that's what you mean. In my case they were impossible to remove without destroying anyways.

    I am pretty sure mine is too loose. Is there a guideline describing how tight it is supposed to be? There is a weird nut sort of like an inverse flower that tightens it; it is under the nut that keeps the handlebar holder thingy in place. I reckon the flower-nut is crucial for adjusting the triple tree bearings tension, but I have no tools in hand to adjust it. Do you think I could just hit it with a screwdriver/hammer combo to tighten it above hand-strength?
  7. Bronco638

    Bronco638 Nobody Home

    Joined:
    Dec 1, 2004
    Oddometer:
    4,245
    Location:
    Itasca, IL
    If anyone is interested, there's an NX250 motor on the Springfield IL Craigslist: LINK

    I have no knowledge of the seller nor am I close enough to act as an intermediary (sorry). Perhaps this will help one of you locate a spare motor.
  8. scrambler66

    scrambler66 Been here awhile

    Joined:
    Oct 5, 2011
    Oddometer:
    346
    Location:
    Germany


    rrrright, for this reason I used a modified arrow exhaust, originally intended for the NX650. The stainless arrow is fairly cheap to get in Europe (about 260$), and it is even street-legal. This means, the sound is more thumper-like, but not too loud. With the arrow, my NX revs even better.

    [​IMG]

    While I’m at it, I initiated a small series of stainless steel manifolds - that’s the first one.

    [​IMG]


    [​IMG]

    et voilà – the first Nixie with a complete stainless steel exhaust :freaky. Mmmhh, I wish someone could build me a stainless frame, too … dang winter :huh

    [​IMG]
  9. Jacl-Kampuchea

    Jacl-Kampuchea Booze Merchant

    Joined:
    Sep 27, 2010
    Oddometer:
    772
    Location:
    I see Drunk People.
    Good work Scrambler66:deal

    Considering doing a few of them to sell to other NX owners?
  10. scrambler66

    scrambler66 Been here awhile

    Joined:
    Oct 5, 2011
    Oddometer:
    346
    Location:
    Germany
    Well, actually the manifolds are for a couple of members of our German NX forum. But after that first batch is sold, the manufacturer will build them on request. For a bit higher price, though (about 130€ = 160$). But I doubt that he will ship to outside Europe …
  11. Honda land cruiser

    Honda land cruiser Adventurer

    Joined:
    Mar 25, 2013
    Oddometer:
    14
    Hello Fellow inmates,

    I am on the hunt for a NX250. Any condition running or not, must be complete. I am located just north of Spokane Washington and would prefer to stay in the PNW. If anyone knows some one that has one or knows where i can get one please let me know.

    Thanks

    Dan 509-385-1272
  12. socalrc31

    socalrc31 Adventurer

    Joined:
    Apr 11, 2012
    Oddometer:
    69
    Location:
    Corona, CA
    Just picked up this cherry 1988 NX250 - 550 original miles! :D

    Had to drain & replace all the fluids and soak the carb for a week in cleaner to break it free but it's running now and lots of fun!

    Also rebuilt the forks - seals, oil and a bit more pre-load... Now I just need a shock!

    Here she is on her maiden voyage in the dirt! CNF (I know it sucks - lol!)

    [​IMG]
  13. Honda land cruiser

    Honda land cruiser Adventurer

    Joined:
    Mar 25, 2013
    Oddometer:
    14
    Socal,

    Nice find. What did you get it for?

    For sale?????????

    HLC
  14. jsonder

    jsonder Tired Old Fart

    Joined:
    Oct 27, 2007
    Oddometer:
    544
    Location:
    Green Valley, AZ
    I thought that the rack started with the '89 model.

    It sure is pretty. Mine is my street bike these days.

    [​IMG]

    That is a Great Basin bag on the bike.
  15. victory80

    victory80 Adventurer

    Joined:
    Jan 6, 2013
    Oddometer:
    42
    Location:
    sf bay area california
    Scrambler66,

    Liking your supermoto style and custom header/exhaust!

    Took the nx on its longest ride to date, a whopping 75 miles in the canyons and I have to say , I love this bike! Even with it's original suspension and brakes it handled everything with ease. The motor ran perfectly and the fan turned on twice at a stop light. Btw does anyone know what temp thermostat or at what temp the fan kicks in? Before the ride I changed the filter and oil with Shell Rotella T6 15w40 and a KN 112 oil filter and it seems to be running fine, no clutch slippage...beats spending twice the amount for Honda hp4.
    A picture for now,

    [​IMG]
  16. heliyardsale

    heliyardsale Always looking for Dirt!

    Joined:
    Feb 25, 2009
    Oddometer:
    420
    Location:
    CNY.. Home of too many Liberials, yuck!
    I have an NX250 in great shape I will sell in CNY. 1988 blue, ~5k miles all original. Price $1600 firm. PM me if interested.
  17. Honda land cruiser

    Honda land cruiser Adventurer

    Joined:
    Mar 25, 2013
    Oddometer:
    14
    Pics and all other details please....

    HLC
  18. tntmo

    tntmo Been here awhile

    Joined:
    Jan 31, 2012
    Oddometer:
    536
    Location:
    San Diego, CA
    I just posted a bunch of parts in the Flea market if anyone is interested. A complete engine and a bunch of bits and pieces.
  19. crobox

    crobox Been here awhile

    Joined:
    Nov 28, 2012
    Oddometer:
    324
    Location:
    Taos, NM
    I posted a few times on here a few weeks ago, starting at post 6133 back on page 409. I am the guy who bought a beat-up, non-running NX250 which turned out to have a major problem with an intake valve, for $250. I'm also the guy who was considering transplanting the suspension from a CanAm 250, just so I could turn the NX into a little trail-rider practice bike.

    Well I mentioned my ideas to a friend named Shawn (in fact the husband of the woman who sold me the NX) and he told me that he had a 1986 Kawasaki KLR600 rolling chassis (no engine, tank, seat, plastics, etc.) that I could HAVE. So I got to work.

    Following is a list of the things I've done to the bike, which I privately think of as my Hondasuki KLNX250R.

    Front end: From the triple clamps down, it's all KLR600. I pressed the steering stem out of the NX250 bottom triple clamp and pressed it into the bottom triple clamp of the KLR, although the NX stem was 2mm smaller in diameter so I had to machine a sleeve, 1mm wall thickness, complete with bottom "step", to make up the difference. Using the NX stem meant no worries about the bearings. Light machining was also required for the top triple clamp. I used the NX front brake master cylinder and brake line too, and bolted the line right up to the KLR caliper. I did have to tig weld in an extension to the brake line to make it longer. Also made some special brackets to mount instrument cluster and key-switch. Of course the bike also now has a 21" front wheel (although the tire is pretty worn out). Total cost: about $30 for KLR front brake pads.

    Handlebars: Aluminum, from a Suzuki RM something or other. Free from Shawn. New Scott grips from Cycle Gear. Old mirror from some previous project. Total cost: $13 for the grips.

    Front fender: leftover from my Honda XL600R project, painted blue. Cost: $8 for fancy plastic spraypaint.

    Seat: From eBay. Needs to be recovered. I bought navy blue vinyl for the job, but haven't done it yet. Cost: $52 for seat and vinyl.

    Footpegs: Swapped on the KLR footpegs, which are nice dirt-bike style. Easy bolt-on job, no mods required. No cost.

    Rear fender: Piece of junk that was on there before, but I did re-position it higher up to fit with the seat better. Should probably be replaced one day. No cost.

    Rear end: The tire from the KLR was basically brand new, as well as being a 17" rim. Too good to pass up. I decided the easiest way to use the back tire was actually just to use the swingarm from the KLR too. And, the swingarm is aluminum and pretty cool looking. A fair amount of ingenuity and machining was required to make it work. Lots of swapping of parts from both bikes and machining of new parts to make the swingarm pivot area solid and functional. I also had to modify the NX brake pedal to get it to fit in there between the swingarm and the frame. I also had to shorten the cable which goes from the brake pedal back to the brake arm, which was not super easy because it's a cable instead of a piece of solid round steel, like on the NX. The KLR was missing the brake arm, so I had to get that on eBay. Also had to buy brake pads. The original NX chain fit right on! Total cost: about $50 for brake pads and arm.

    Rear suspension: Got a GSXR 750 shock from eBay for $22 shipped. There were cheaper ones, but this one looked good. The fit is not really plug 'n play. The top mount of the GSXR shock is 5mm wider than the NX, so the the little angled support arms on the NX (that go from the rear engine mounts up to the shock) need to be machined. Specifically, 2.5mm needs to be removed from the inside face of the top boss on each of these arms. The bottom fits fine. As many others have noted, this shock is not compatible with the stock airbox, which was no problem for me as I put on a UNI foam pod. However, it's also not compatible with the stock exhaust, which is something I do NOT remember reading. (Maybe I missed it). I also made new connecting arms to replace the "wishbone" connecting arm from the NX, near where the shock connects to the swingarm. I needed to do this because the KLR swingarm is configured differently, and I took the opportunity to make the link a bit shorter and get myself some more height in the back. Cost: $22 for the shock.

    Exhaust: Once I realized I couldn't bolt the stock exhaust back on with the GSXR shock in there, I rooted around in my parts pile and found an old stainless supertrapp. I cut the bit of pipe off the original muffler (the part where it attaches to the header) and did a caveman job of welding the stainless muffler directly to it. I then totally reconfigured the mounting tabs from the supertrapp to mate up with all the mounting points on the frame where the original muffler used to be supported. The supertrapp had no baffle discs or rear cover, so I made those. No cost.

    Kickstand: Extended by about 2 inches. No cost.

    I've done a few other small things here and there, like re-routing cables and such, but that's the main stuff.

    So let's see, the total cost is.....
    (I'm curious too!)

    $425.00. Not too bad. I haven't titled it yet. Not sure if I will. Shouldn't be a problem though, as the frame VIN and the engine number are unchanged, and that's all they care about in New Mexico. Ahhh, gotta love New Mexico!

    I will do a few other things as time goes by, like add some "wings" to the fuel tank to protect the radiator, re-cover the seat, maybe add a headlight, and get into the head to deal with that problem valve (but only if I have to!!). For now it runs fine, and is lots of fun. And I don't mind dropping it!! (Although I haven't yet...)

    Here it is:

    [​IMG]


    [​IMG]

    If anyone wants close-up pix of anything, just ask.

    Oh, and also... I've got a pile of parts from the NX that I don't need, such as: both sides tank fairings, headlight fairing, headlight, headlight mounting bracket, front fender, forks, complete front wheel, triple clamps (minus stem), speedo cable, complete rear wheel, rear shock (ooh, I bet that's a hot item!), swingarm, seat-pan (no foam or vinyl, plastic pan only), airbox, and maybe some other stuff. Fairings are decent, a few cracks and scuffs. I'll post an ad in the flea market one of these days, or PM me if you want something.

    Cheers,
    Christian
  20. Jacl-Kampuchea

    Jacl-Kampuchea Booze Merchant

    Joined:
    Sep 27, 2010
    Oddometer:
    772
    Location:
    I see Drunk People.
    Wow, you don't hang around too long over a job do you?:rofl

    Good work! The bike looks much taller than stock now. What sort of ground clearance would you estimate & roughly how much longer than stock is your wheelbase now?

    Thanks,

    P