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NX250 Thread -- official ADV owners manual

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

  1. muzcuk

    muzcuk Adventurer

    Joined:
    Aug 3, 2011
    Oddometer:
    66
    @travial sounds about right. I thought I was being smart draining the bowl before parking it last season. Maybe it just wants to be ridden, poor thing.
  2. Mr Kraabs

    Mr Kraabs n00b

    Joined:
    Dec 16, 2018
    Oddometer:
    2
    Location:
    France
    Hey guys,

    Just bought my first NX250 yesterday and drove her home 2 hours.
    She's a bit rough around the edges but I'll be bringing her back up to shape.

    Amongst other issues, there's one I'm having difficulties to diagnose. When under load, under 5000 rpm, the whole bike shakes pretty violently. When slipping the clutch it feels like it's chattering in a way. It's somewhat reminiscent of riding a big single at low rpm's where it smoothes itself out after picking up some revs, as above that 5000 rpm mark it runs like a little sewing machine, happily riding along at 120 km/h in sixth with close to zero vibrations.
    All the gears shift smoothly and neutral is always easy to find. Zero clutch slip.
    Do these engines have a balancer shaft system? Chain or gear driven?
    I'm thinking of diving into the clutch, see if it has issues with the springs maybe explaining that chattering.

    Anyways, thoroughly impressed by this quarter litre, can't wait to get it to run smoothly!
    Cheers

    NX250.jpg
    JohnnyC555, scrambler66 and PTC like this.
  3. travial

    travial Adventurer

    Joined:
    Aug 17, 2016
    Oddometer:
    78
    @Mr Kraabs Funky colors on that one, I like it. Congrats on the new bike and welcome to the forum. Have you tried adjusting the clutch cable to make certain it's engaging all the way? There's a collar nut on the hand lever and also adjustment nuts on the clutch cable bracket on the engine. I personally like to set it to start engaging around the first 1/4 to 1/3 of the lever release, but it doesn't matter where as long as you get full engagement by the time the lever's all the way out. It does have a gear driven balancer shaft if I remember correctly, but that shouldn't be the issue if it runs smoothly over 5k.
  4. PTC

    PTC Turd polisher

    Joined:
    Nov 20, 2008
    Oddometer:
    872
    Location:
    masshole mofo
    This bike NEEDS to rev. Lower than 35-4000 they aren’t happy at all. im going to guess the carbs gummed up and isn’t properly fueling at part throttle. The clutch is a Cush drive and is prone to a “knocking” noise at idle and low rpm. Engage the clutch slightly In neutral and see if it goes away? I’m told this is due to stretched rivets in the basket. Mines had this noise since I bought it at 5k. Never an issue just annoying. An inspection showed no looseness when I was in there, but I’m sure those rivets are stronger than my hands.
    Nice ride. And welcome!
  5. tneer3

    tneer3 n00b

    Joined:
    Sep 3, 2020
    Oddometer:
    4
    Location:
    Cambria, CA
    That's more good info PTC. Thank you! Upon hearing my NX start for the first time I was worried about the subtle knock you describe at low RPMs. I wish I had got the RPMs up rather than shut it down as I did. I shut down and thought I would check the valve clearances but I have no experience doing so on the NX. Part of me is just thinking I'll skip that and learn that lesson later. I'll finish the carb rebuild, give her an oil change, and get it back on the road keeping the revs up. That should happen this weekend or next. I'll give it a close listen and maybe even post a video for others to hear.

    When I do get to checking my valve clearances, any tips on that? I have a service manual coming in the mail but thought Id ask the brain trust too. TIA
  6. Honda Scoot

    Honda Scoot Time To Ride

    Joined:
    Sep 24, 2008
    Oddometer:
    710
    Location:
    Sebring Ohio
    Good Karma on this thread!
    @valvecrusher did you put those boxes of parts to good use last decade?
  7. scrambler66

    scrambler66 Been here awhile

    Joined:
    Oct 5, 2011
    Oddometer:
    744
    Location:
    Germany
  8. Spurlock

    Spurlock Long timer

    Joined:
    May 5, 2015
    Oddometer:
    1,999
    Location:
    Vacaville, N. California
    Hi scrambler, I'm happy to take care of that. I will order right now and PM with shipping options once I have the items.

    -Bill
    valvecrusher, travial, tneer3 and 2 others like this.
  9. travial

    travial Adventurer

    Joined:
    Aug 17, 2016
    Oddometer:
    78
    Hey guys, the last two weekends I went riding in the Daniel Boone National Forest in Kentucky, lot's of really nice trails up there, and the NX kept up with the KTM's just fine for the most part :) I highly recommend the GSF600 shock upgrade and the CRF230 fork springs for trail riding, no bottoming out at all the entire time. I'm in dire need of a skid plate though, the stock one is currently beat to hell and hanging on by a thread, and I'm tired of plastic welding the thing back together. Any good options available?

    20200919_162300463_iOS.jpg 20200919_211717303_iOS.jpg 20200920_180113960_iOS.jpg 20200926_173032069_iOS.jpg 20200926_192711696_iOS.jpg 20200927_142911592_iOS.jpg 20200927_145929090_iOS.jpg 20200927_164804924_iOS.jpg 20200927_170052262_iOS.jpg PXL_20200927_142651309.jpg

    And here's a video of me looping out the NX on a hill and busting my taillight into 100 pieces. Not my proudest moment. Anyone know of another place to get a taillight besides WeMoto.com? They seem to be out of stock at the moment.
  10. Kolb Driver

    Kolb Driver Been here awhile

    Joined:
    Oct 21, 2016
    Oddometer:
    186
    Location:
    Kingsport, TN
    If you can make the tail light internals work, there's a bunch of lenses on ebay.
  11. JohnnyC555

    JohnnyC555 Adventurer

    Joined:
    Jan 14, 2020
    Oddometer:
    28
    Location:
    Des Moines, IA
    Would there be anyone interested in a luggage rack for those missing the OEM? I designed this up for a buddy's NX250 and didn't know if there'd be any value for anyone else. Or does anyone have any design recommendations? I have some metal fab suppliers from my last job that I think could laser this out pretty easily and bend.

    Thoughts?

    NX250 luggage rack.JPG
    scrambler66 and Spurlock like this.
  12. JohnnyC555

    JohnnyC555 Adventurer

    Joined:
    Jan 14, 2020
    Oddometer:
    28
    Location:
    Des Moines, IA
    What do you think of this very rough draft? Can you tell I'm avoiding doing my real work today?
    120288195_3467327440054627_8535072469080373826_n.png
    PTC, scrambler66 and travial like this.
  13. Johnnyfever

    Johnnyfever Adventurer

    Joined:
    Aug 30, 2020
    Oddometer:
    41
    Location:
    spokane
    There is a definite need for one. No vx skidplate worldwide right now. Depending on price, i would buy one.
    JohnnyC555 likes this.
  14. JohnnyC555

    JohnnyC555 Adventurer

    Joined:
    Jan 14, 2020
    Oddometer:
    28
    Location:
    Des Moines, IA
    Thanks Johnny, good name btw!

    My CAD is SUPER rusty since I haven't done any kind of real CAD work since college, and that was 7 years ago. If anyone has recommendations or ideas to implement with the rack or skidplate, I'd love to hear it.
  15. Zic00

    Zic00 Adventurer

    Joined:
    Oct 3, 2019
    Oddometer:
    18
    Location:
    Delaware
    Hey guys! Little update with my coolant leak. Looks like a new radiator cap did the job. The bike even ran a little better, haha and bro I'd definitely buy both of those! Please keep us updated.
    PTC likes this.
  16. Pepel_PR

    Pepel_PR Adventurer

    Joined:
    Jun 14, 2016
    Oddometer:
    14
    Location:
    Moscow
    Hi guys! Take a look some photo from Krymea

    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
  17. scrambler66

    scrambler66 Been here awhile

    Joined:
    Oct 5, 2011
    Oddometer:
    744
    Location:
    Germany
    Great idea - a sturdy aluminum engine guard is exactly what we need :clap. A few decades ago, the Marlboro Rally's NX250s had such a guard. Unfortunately I only have these pictures. The protection should be pulled further to the side so that above all the housing of the water pump is protected.

    [​IMG]


    I have a few more ideas for the brackets. The original upper holder at the frame is too weak for a stable aluminum protection. So it's better to attach with the bolt above. Or you can use the bracket of the motor housing. The engine protection could then be attached with a U-shaped bracket.

    [​IMG]

    I had a self-made engine guard on my NX250 back in the 90s. It was darn ugly and heavy - IMHO it should be as small and light as possible.

    [​IMG]
    JohnnyC555, PTC and Spurlock like this.
  18. Hagaviking

    Hagaviking Adventurer

    Joined:
    Jul 1, 2019
    Oddometer:
    10
    Location:
    Western Norway
    Dear all, boy was i lucky today, during work i was by a garage that some rallycross drivers was moving out off, saw this and the owner just gave it to me, refused any payment. Looking forward to test it out.

    But, i have a problem with my near light, full light and park is fine, but no normal running light. Was wondering if someone could help with a good way to go about this, no so good with electrical side off the bike. Tried two new bulbs, same result. All fuses good, handle bar switch seems good, wire problem.?

    Best regards

    V

    Attached Files:

  19. Pepel_PR

    Pepel_PR Adventurer

    Joined:
    Jun 14, 2016
    Oddometer:
    14
    Location:
    Moscow

    This CAP should be 1.1!!!

    [​IMG]
  20. Reverand Hope

    Reverand Hope Been here awhile

    Joined:
    Oct 8, 2016
    Oddometer:
    130
    There's a definite market for a sturdy, lightweight sump guard for the NX/AX1. The AX1 is popular in Greece and the far east, so I guess you'd market it via Farcebook and related forums. If you were more inclined to have a small batch made up based on pre sales, then there'd be less risk. Figure out a realistic price for both the sump guard and rear rack and see what the response is like. On the rear rack, I'd be tempted to put a couple of slotted tangs on the back edge as well.
    JohnnyC555 likes this.