BMW G650X Challenge Thread Index

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

  1. DiscoDino

    DiscoDino Long timer

    Joined:
    Jan 12, 2007
    Oddometer:
    1,825
    Location:
    Lebanon/NYC
    Be careful when running with the TT petcocks closed...what we experienced on our Trans Lab ride with 2 TT-tank equipped Xchs was that my buddy's had the petcock closed (after shipping the bike and forgetting to turn them back on), and because the main tank was burning the fuel without venting, it added pressure to the system and the main fuel line that went from the main tank to the EFI accumulator created a pinhole leak, draining fuel all over the middle of the bike. You can see that line if you take your seat off. We had to do a trailside repair to fix it, and then noticed that the line, other than being specifically bent to go around certain things, is a 6mm on one side and 8mm on the other...and costs 60$ from BMW!

    I kept my bike fully open at the petcocks and have not had any issues with that line (bought a spare nonetheless!). That way both fuel tanks will vent, and the TT will siphon to the main tank. Another issue was that the breather at the top of the OEM tank has a ball vent system that you need to remove to allow for unrestricted flow from the TT to the OEM tank...I have yet to do that procedure, but was advised to do so by a couple of inmates. I checked the parts fiche to make sure, and I recall that after dropping my bike on the side, the TT tank stopped siphoning in...due to the ball valve stopping the venting to the OEM tank...

    YMMV
    Nadim
  2. bigdon

    bigdon Long timer

    Joined:
    Dec 12, 2005
    Oddometer:
    2,747
    My TT tank is plumbed into the bottom of the main tank. Both tanks are vented separately. I have had no problems with the venting.

    A friend from Australia was feeding his TT Tank through the main tank vent. He told me that it worked really well until it got real hot and then would stop feeding. Some kind of vapor lock he thought!
  3. DiscoDino

    DiscoDino Long timer

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    Jan 12, 2007
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    Lebanon/NYC
    Ah, my bad...thought you had it in from the vent line...vapor lock or simply that ball valve moving and then getting stuck...with 2.2G, not a big deal...with 6.6G...big deal...
  4. G-RDR

    G-RDR gedubya

    Joined:
    Aug 2, 2008
    Oddometer:
    118
    Location:
    San Angelo, Texas
    bigdon quote: "My TT tank is plumbed into the bottom of the main tank. Both tanks are vented separately. I have had no problems with the venting."

    bigdon,

    I've got a TT tank on order. Is the way you have yours plumbed in the way the directions say to do it? (Assuming it comes with instructions.)

    Do you have to drill a hole in the main tank? I like the idea of being able to remove the TT tank for shorter trips and just run off the main.

    I am trying to get prepared in advance so that I can put the tank on next weekend then do an quick 800 mi trip to NM the following weekend.

    Any help anyone can give is appreciated!:freaky
  5. DiscoDino

    DiscoDino Long timer

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    Jan 12, 2007
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    Location:
    Lebanon/NYC
    (I know this is not addressed to me...but thought I'd contribute)

    It does come with instructions, and it does state you need to drill the OEM tank. I didn't do that...I went through the vent PM me your email address and I'll send you a step-by-step that a buddy and I did so we can plumb it right (based on ALL the help from inmates here!)

    I do recommend high quality EFI hose (1/4") and clamps (Stainless steel), along with a single quick disconnect (high flow, OMEGA)...

    Cheers,
    Nadim
  6. bigdon

    bigdon Long timer

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    Dec 12, 2005
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    My tank was installed using the TT supplied directions. I had the dealer install. I called and got a price quote and thought that would be the way to go as I did not have time to do it. I think they quoted roughly $300 to install. When I picked it up the bill was $700. I was pissed and will not use that dealer again.
    My tank was installed using the TT supplied fuel lines and petcocks which are junk when used with the gas that is available in Texas. The petcocks started leaking in just a few weeks and the fuel lines started to leak in 4-6 months.

    DO NOT I repeat DO Not use the supplied stuff.
    I had to remove the stock tank to be able to change out the fuel lines.I also installed Quality Pingle Petcocks at about $70 each.

    As far as taking the TT tank off and running the bike. Mine is installed with self sealing quick disconnects. The tank will come off in about 15 minuets . I have never tried to reinstall the stock plastics but would think they will not fit because of the extra mounting points for the TT Tank. It would run but be very ugly!

    IMO YMMV
    Proud Highway likes this.
  7. G-RDR

    G-RDR gedubya

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    Aug 2, 2008
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    San Angelo, Texas
    discodino, I sent you a PM
  8. DiscoDino

    DiscoDino Long timer

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    Jan 12, 2007
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    Emailed!
  9. mcgiggle

    mcgiggle Been here awhile

    Joined:
    Jan 5, 2008
    Oddometer:
    272
    Location:
    UK
    I'm wondering wether to rip the engine down and see if the camchain tensioner rail need replacing (30000 miles covered) but looking at what needs to be taken apart I'm now thinking leave alone, what do you think guys?
    I know Walter ripped his motor down but I don't recall the rail being replaced or worn.
    If I don't do it now that means 70000 miles on the bike before I'm home again.

    Cheers
    Pete
  10. G-RDR

    G-RDR gedubya

    Joined:
    Aug 2, 2008
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    San Angelo, Texas
    bigdon, I sent you a PM
  11. FinnDuro

    FinnDuro Winter wonderlanding

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    Aug 15, 2007
    Oddometer:
    460
    Location:
    Finland
    I would not worry about it, sounds like a pretty far fetched & more of a theoretical problem scenario to me. Can't think why mere 30.000 miles on Rotax would wear that cam rail down...
  12. Colebatch

    Colebatch "Moto Porn"ographer

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    Jul 7, 2006
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    Schmocation
    I had no discernible wear on the two plastic rails mate ... so left them alone and didnt replace them
  13. jonnyc21

    jonnyc21 Trials Ninja

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    Feb 8, 2011
    Oddometer:
    3,990
    Location:
    Boise aria
    I agree, after installing my TT tank I can't see where the stock plastics would fit back on the bike. if you wanted to remove it getting the upgraded fuel lines and quick diskconnects would let you do that, but you would likly need a custom cover of some kind or modify the stock plasticks to make them fit with the mounting bracket setup for the TT tank.

    Good luck!
    :tough
  14. mcgiggle

    mcgiggle Been here awhile

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    Jan 5, 2008
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    UK
    Cheers guys, I'm a great believer in if it ain't broken etc etc.
  15. evanphoto

    evanphoto May G-d bless Evel

    Joined:
    Aug 23, 2004
    Oddometer:
    416
    Location:
    NYC
    hi all,
    going to do my first oil change. what do you guys like for an oil filter? what size? 2007 bmw 650x challenge
  16. cdavisrosco

    cdavisrosco Been here awhile

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    Dec 3, 2009
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    127
    Location:
    New Orleans
  17. cdavisrosco

    cdavisrosco Been here awhile

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    New Orleans
  18. kclark

    kclark 1SevenZero

    Joined:
    Oct 14, 2010
    Oddometer:
    120
    Location:
    Washington
    I recently installed the TT Tank. Mine is installed per the instructions. I couldn't picture a reason to remove it for shorter rides. If your worried about the weight of the gas making it heavy in corners on short rides, just don't fill it. Honestly on my recent ride with it filled to capacity I didn't notice it in corners at all. My use is about 70% dirt (single track and double track).
  19. Niedz

    Niedz Been here awhile

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    Oct 2, 2010
    Oddometer:
    646
    Location:
    Bucks County, PA
    Oil change question--

    I know you are supposed to change the oil with it hot, but why specifically?
    If the motor is cold and you drain the crankcase and the reservoir up top, what is the difference hot or cold?
  20. QUIRKSM

    QUIRKSM Been here awhile

    Joined:
    Oct 2, 2008
    Oddometer:
    130
    Location:
    Waterford, CT
    When the oil is cold it runs really slow. So with it hot it takes less time. Also it stirs up any contaminants that could have settled form sitting which makes them come out with the oil. I usually forget to warm the bike up and do it cold, hasn't caused any problems but takes forever to drain the resevoir through that little valve on the bottom.