BMW G650X Challenge Thread Index

Discussion in 'Thumpers' started by GB, Apr 24, 2008.

  1. Dutchgit

    Dutchgit Completely clogless

    Joined:
    Jun 24, 2012
    Oddometer:
    1,627
    Location:
    Герма́ния
    I'd check the coils. Maybe the low rpm coil has had it. (Can't remember which one it is though)
  2. Dutchgit

    Dutchgit Completely clogless

    Joined:
    Jun 24, 2012
    Oddometer:
    1,627
    Location:
    Герма́ния
    Put some fresh rubber on our front wheels today using my newly acquired Motion Pro bead breaker and tyre spoon. No problemo !

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    Last thing a rodent sees when he's not careful :lol3

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    Mitas XT 644 Army

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    Excellent all round tyre and cheap and lasting too.
  3. e28rusty

    e28rusty Fool

    Joined:
    May 16, 2011
    Oddometer:
    254
    Location:
    Willamette valley, OR
    Hi guys, I bought my XChallenge a couple weeks ago from an inmate in Alabama and had it shipped up to Oregon. I just got back from a 3 day trip on the Cascade Discovery Route here in OR and I really enjoyed the bike, so much smoother than the 640a it's replacing.


    I noticed a couple of things on my first longer ride:
    First, the airshock has got to go. I'm 5'8" and I can manage the height of the bike mostly OK except for when I start to tip over and put my foot down the shock shoves me up and I end up on the ground. I tried experimenting with the air pressure, it seems that I need at least 120psi in the shock to ride the rough stuff and I'm really struggling with the height. I'm thinking about ordering a hyperpro and getting it a bit shorter or maybe getting an ebay xcountry shock. My wife is going to kill me.

    Second, I really don't need the big TT fuel tank that came on the bike and I don't care for how it looks. I'd be interested in selling it but I would want to work trading stock plastics in with the deal. Anyone interested in a swap+cash before it goes on ebay?


    And here's some photos from my first ride on the new beast:
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  4. SIF

    SIF Adventurer

    Joined:
    Aug 23, 2015
    Oddometer:
    16
    Location:
    Kent
    Great advice thank you, changed the plugs and the vibes have gone ! Brilliant as I'm off to France on it next week, Merci !
    seasider likes this.
  5. blaster11

    blaster11 Still having fun!

    Joined:
    May 7, 2008
    Oddometer:
    8,516
    Location:
    Southern Maryland and West Virginia
    The bike I bought had the Hyperpro lowered shock already on it and it makes it much easier to mount and dismount being how it is shorter, the shock works well!
    e28rusty likes this.
  6. Meriden

    Meriden Yea whatever

    Joined:
    Oct 26, 2010
    Oddometer:
    1,231
    Location:
    In the garden behind the dacha
    Welcome to the club. If you plan to ride any off-road at all, don't buy an X Country shock. I bought one new on Ebay from a dealer who was clearing inventory. It works fine on Texas gravel roads, but is sorely inadequate for the Mojave. As for the tank, I wish I had some spare plastics and I would try to work a deal. Expect the practical range on your stock tank alone to be between 90 and 120 miles.

    m
    Dutchgit likes this.
  7. e28rusty

    e28rusty Fool

    Joined:
    May 16, 2011
    Oddometer:
    254
    Location:
    Willamette valley, OR
    Hmm... good to know about the xcountry shock, that's discouraging though. There doesn't seem to be a cheap solution to the airshock problem
  8. MJS

    MJS Long timer

    Joined:
    Dec 23, 2005
    Oddometer:
    2,640
    Location:
    Off the grid in San Felipe, Baja
    Give Ted Porter at Beemer Shop a call about shocks. He built some custom Yacugar shocks for our two X's. They have worked great off road in Baja and riding the Swiss Alps.

    He sells a number of brands so has options regarding price. Any custom shock tends to be expensive but it is worth it.
  9. Dutchgit

    Dutchgit Completely clogless

    Joined:
    Jun 24, 2012
    Oddometer:
    1,627
    Location:
    Герма́ния
    Yep, custom shocks are pretty expensive but get a good one and you won't look back.
    keepshoveling and blaster11 like this.
  10. daze55556

    daze55556 Adventurer

    Joined:
    Nov 17, 2013
    Oddometer:
    71
    Location:
    Melbourne, Australia
    I went with the Ohlins shock with slightly heavier spring to carry the extra luggage, also went with WP forks. The change is mind blowing, I was always happy with the bike but it is transformed. For all the good points of the bike the suspension from the factory is quite simply awful.

    Pic of my baby, taking it to South America for 6 months, leaving in 4 weeks!

    20160709_114902.jpg
  11. Butters

    Butters Kwyjibo

    Joined:
    Oct 10, 2008
    Oddometer:
    5,535
    Location:
    NoVA
    I'm also 5'8", and I got rid of my airshock for the very reasons you want to. I went with the standard emulsion Hyperpro (around $600). It is definitely one of the things I wished I did far sooner.

    I really struggled with whether to get a shortened shock. Frankly, just getting a conventional shock is a huge help, since you don't have the shock fully unloading with no weight is on it. As you know, once your ass is off that seat the suspension jacks up and there is no getting back on if you are on uneven surfaces.

    In the end, I think I went with .5" shorter and couldn't be happier. It is nice, when on uneven terrain, to know I can solidly get at least the ball of one foot down even if it is on the downhill side. It has made me more confident on rougher terrain.

    The Ohlins is nice, but it actually increases the seat height. If I am not mistaken, blaster11 has my buddies old bike (McGarrett). He is only about 5'5". He was traveling when his bike arrived, so I accepted it when the bike shipped. With the Ohlins, I could only get a tiptoe down on one side by sliding my butt way over. I wouldn't recommend the Ohlins unless you get it shortened or are over 6'. I think Mike (McGarrett) went with a 1.5" shorter on his Hyperpro, but I'm not certain. He also got the fully adjustable version ($1K+). He never regretted it either.

    Do remember, it is about a 3:1 ratio with the shortened shock. So 1" shorter shock will be roughly 3" lower seat height. I would recommend biting the bullet now and getting some form of brand name conventional shock (Hyperpro, Yacugar, Ohlins). You can likely sell your old airshock for about $100 to offset the cost.
    keepshoveling likes this.
  12. BikerBobber

    BikerBobber Trying to get lost

    Joined:
    Feb 28, 2011
    Oddometer:
    1,303
    Location:
    Seeleys Bay, Ontario
    I also got the full works Hyperpro (remote reservoir, remote preload). I had it shortened 1/2". Still too high for my 29"inseam when I added the Seat Concepts seat height increase. That said, still a night and day difference from the crap air bag. If I were to do it again I would shorten it 1 1/2"...

    Bob
  13. Meriden

    Meriden Yea whatever

    Joined:
    Oct 26, 2010
    Oddometer:
    1,231
    Location:
    In the garden behind the dacha
    As promised here are some photos of the Mosko Reckless 80L 2.0 on a Challenge with DirtBagz Racks. I packed these with my normal camping gear and spares, but no food. There is still room to grow. I still need to decide if and how I plan to use the heat shield since the racks and existing heat shield keep the material off of the can now.

    This is just a mock up and I won't know exactly how this will work out until I've lived out of it for a week. I still need to tame all the strap tails. Also, notice that this setup covers the gas cap as does the Nomad and the Great Basin. They all do that, but it is easy enough to release the buckle and move the bag out of the way for fueling.

    Again, thanks to Snooker for mentioning these in the first place.

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    FWIW, I think this is about the best solution for my bike and riding needs.

    m
  14. e28rusty

    e28rusty Fool

    Joined:
    May 16, 2011
    Oddometer:
    254
    Location:
    Willamette valley, OR
    What gas tank is that?
    cgguy09 likes this.
  15. Stromius

    Stromius Part time danger seeker

    Joined:
    Jan 28, 2011
    Oddometer:
    126
    Location:
    Seattle, WA area
    octopusenvy likes this.
  16. Meriden

    Meriden Yea whatever

    Joined:
    Oct 26, 2010
    Oddometer:
    1,231
    Location:
    In the garden behind the dacha
    KTM panel tank from Baja Designs. Butters and TBarstow came up with the concept. The tank has been discontinued, but are still available on ebay from time to time. IT's a cheap alternative to the XTank, but doesn't add rigidity to the subframe.
  17. Butters

    Butters Kwyjibo

    Joined:
    Oct 10, 2008
    Oddometer:
    5,535
    Location:
    NoVA
    It's an Acerbis 1.1 gallon aux tank for a KTM, modded to fit. I don't think they make it anymore, at least last time I looked I couldn't find one. It can be hot water expanded to almost 1.5 gallon. I haven't run mine dry, but I bet I can go 200 miles in a pinch. TBarstow has a link to his writeup in his sig line. I'm sure he has posted within the last couple pages of this thread. You can also search this thread for Acerbis or KTM tank or even "justgastanks.com" as that is where I got mine. It takes minor fabrication, but it is a whole lot cheaper than other options. Another mod I wish I did much sooner.
    keepshoveling likes this.
  18. Butters

    Butters Kwyjibo

    Joined:
    Oct 10, 2008
    Oddometer:
    5,535
    Location:
    NoVA
    I would love to take credit, but the first place I saw it was an inmate named OGGI, a couple years before I did mine. I'll take a little credit for adding in the hot water expansion though. :-)
    Meriden likes this.
  19. seasider

    seasider Just a rider

    Joined:
    Oct 27, 2007
    Oddometer:
    958
    Location:
    Virginia
    Chain tool
    Installed my new chain this afternoon and I'm not happy with the result of the rivited link due to my chain tool. Had it for years from when my son rode mx so not even sure of the brand.
    Anyway I will re order a new link and want to get a good chain breaker/press for shop and trail. Do any of you have suggestions for a quality unit that will pack small enough to carry if need be?
  20. Grunt

    Grunt I Am Carl Supporter

    Joined:
    Apr 11, 2002
    Oddometer:
    6,394
    Location:
    Ocean Shores, Washington
    OK guys and gals. I have a front brake problem with my X-Challenge and hopefully someone here might have a answer.

    The situation is this. Periodically when I use the front brake the pressure on the disk does not release completely and the friction will cause heat to build up. Eventually it gets really hot, the heat then causes the fluid in the caliper to expand suddenly and the front brake gives me a OH SHIT PANIC STOP without me ever touching the lever. Pretty scary. If I do notice the drag the only fix is to take a 11mm wrench, bleed a little fluid from the front caliper and make sure the pressure is released, then proceed with caution.

    I have rebuilt the front caliper, but it still does it. That means that the problem is in the master cylinder. I even had BMW look at it and they agree.

    Here is the part at which I am stuck. I have been searching everywhere for a rebuild kit for the front master cylinder. BMW does not carry them, but they are willing to order a entire front master cylinder from Germany for me (at a cost which will rival the national debt). As far as I can tell the master cylinder is a Brembo PS13 (the piston is 13mm, that's how Brembo designates them).

    I have disassembled the master cylinder and have the parts, but none of the rebuild kits shown on line match what the parts look like (the pistons or other parts always look different).

    So, here are the questions:

    1. Does anyone know where I can get a rebuild kit for this PS13 (if that is really what it is)? If the parts don't look the same does that mean it is just a updated kit?

    2. If no rebuild kits are available, is it possible to replace the master cylinder with another type and still have the brake switch fit correctly (I don't know if the brake switches are universal or not).

    3. Am I going to have to just bite the big one and buy a whole new master cylinder?

    Any advise would be greatly appreciated.

    Thanks in advance.


    Grunt:baldy
    Yukon Ho! likes this.