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Thread: 1998 R1100RT Evaporative Emissions System

  1. #1
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    1998 R1100RT Evaporative Emissions System

    I have just obtained the 1998 R1100RT from California that the PO apparently removed & discarded the entire Evap system.
    I'm a STRONG believer in staying completely stock and I need some help/resources to restore this system to original.

    I have yet to find any vacuum hose routing diagram.
    Currently I have:
    2 long rubber hoses coming from the right side fuel tank area and running back to dump on the ground near the R/R swing arm below the rear suspension adjuster knob.

    1 short rubber "U" shaped hose across the back of the relay/fuse box connected to nothing. I assume the right hand end should be the outlet of the charcoal canister & the left side end should connect to the purge solenoid inlet.

    1 rubber holder (mounted to the left rear frame rail) for the purge solenoid.

    1 electrical plug for the purge solenoid.

    I have the parts diagram of the associated parts.

    I have yet to find any idea where the purge solenoid outlet hose & Tee connector reconnect to the air inlet manifolds.

    Anyone with a way to provide some resources picture, drawings, parts etc. will be a big help!

    This is not a discussion about the merits of having/removing the evaporative system. I am going to reinstall it.
    Thanks in advance, Ibjman

  2. #2
    . AntonLargiader's Avatar
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    I have an RT apart in the shop; if I'm there today I'll take some pictures.
    Anton Largiader 72724
    largiader.com bmwra.org

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    Quote Originally Posted by ibjman View Post
    I have just obtained the 1998 R1100RT from California that the PO apparently removed & discarded the entire Evap system.
    I'm a STRONG believer in staying completely stock and I need some help/resources to restore this system to original.

    I have yet to find any vacuum hose routing diagram.
    Currently I have:
    2 long rubber hoses coming from the right side fuel tank area and running back to dump on the ground near the R/R swing arm below the rear suspension adjuster knob.

    1 short rubber "U" shaped hose across the back of the relay/fuse box connected to nothing. I assume the right hand end should be the outlet of the charcoal canister & the left side end should connect to the purge solenoid inlet.

    1 rubber holder (mounted to the left rear frame rail) for the purge solenoid.

    1 electrical plug for the purge solenoid.

    I have the parts diagram of the associated parts.

    I have yet to find any idea where the purge solenoid outlet hose & Tee connector reconnect to the air inlet manifolds.

    Anyone with a way to provide some resources picture, drawings, parts etc. will be a big help!

    This is not a discussion about the merits of having/removing the evaporative system. I am going to reinstall it.
    Thanks in advance, Ibjman
    My PO also removed the carbon canister and did the remote filter mod.
    The stated reason for removing these is that sometimes the carbon "dust" ? gets loose, and sucked back into the fuel tank somehow.
    From there plugging up the fuel filter.
    I'm assuming this actually happened, that filter is not something you'd go in after for fun. Although doing both seems silly.
    I did not like the remote filter mod because the filter is unpainted, and the only available space for it is right next to the back tire.
    It will rust and eventually leak. So I noticed some rust (no other problem with it) I installed a new one into the tank where it belongs.

    I don't lean strongly in either the modify or remain stock directions but I would like to know if the carbon clogging issue is real and if anything has been done to fix it. I would think you could splice one of those little inline fuel filters into the vapor lines to prevent carbon from escaping.

  4. #4
    Day Dreaming ... happy wanderer's Avatar
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    Surprised not to find any mention of the charcoal canister or vent lines in the factory manual. My '00 RT's charcoal vent system did not survive it's maiden voyage home. After fluid changes and new tires that was the first thing to go.

    Given the problematic charcoal canister that probably won't survive a bike tip over, lots of hose and connections for vacuum leaks to develop in an already sensitve vacuum balance environment just did not appeal to me. Pulled all that stuff out and replaced it with two simple rubber caps on the throttle body vacuum ports. Now the only place for vacuum leaks is obvious.

    I've seen some guys run a vacuum hose between the right and left side throttle bodies as well.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  5. #5
    Unregistered user norton's Avatar
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    Only bikes that were delivered to The US had the charcoal canisters. European and the rest of the world bikes were charcoal free completely stock.
    Last edited by norton; 09-25-2013 at 12:31 AM.

  6. #6
    24991 Pauls1150's Avatar
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    There have been cases of the charcoal granules being sucked down through the vacuum lines and into the injectors, then into the engine. THAT is Reason Number One to nuke the whole shebang and install two little caps on the injectors' bottom ports.

    Reason #2 is that the extra hoses & fittings provide many more places for little vacuum leaks to happen, either from dried-out lines or cracked plastic. Not only does this allow unfiltered air directly into the injectors, it also affects the throttle bodies' balance.

    Reason #3 is that if the canister gets clogged from too much gas, you can get a vacuum inside the tank - causing the plastic to collapse.

    Considering that European smog rules are just as stringent (if not more so) than California's, there really is NO reason - other than political - to have the [darn] thing on there.

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    Quote Originally Posted by norton View Post
    Only bikes that were delivered to North America had the charcoal canisters. European and the rest of the world bikes were charcoal free completely stock.
    I thought only California bikes had these. I don't think my 99RT has one???

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    Quote Originally Posted by Pauls1150 View Post
    Considering that European smog rules are just as stringent (if not more so) than California's, there really is NO reason - other than political - to have the [darn] thing on there.
    CARB says you can not vent into the atmosphere. That's why they have it.

  9. #9
    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by EMSimon View Post
    I thought only California bikes had these. I don't think my 99RT has one???
    When it came out of the boat/plane from Germany, it did.
    Paul Glaves - "Big Bend", Texas U.S.A
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  10. #10
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by norton View Post
    Only bikes that were delivered to North America had the charcoal canisters. European and the rest of the world bikes were charcoal free completely stock.
    North America includes Canada and Mexico. Don't know about Mexico but in 95 and 96 the RT bikes shipped to Canada had no charcoal canister. They also had no O2 sensors or Cat Code Plugs. So not _all_ oilheads delivered to NA were the same. In 97 BMW stopped shipping Euro models to Canada and started shipping USA models instead. I suspect they did the same for Mexico but do not know for sure.

    I am sure about the Canadian RTs though because I had one and looked into why it was different. It's all in the fiche.

    Pauls1150: Agree with everything you stated except for charcoal granules getting sucked into fuel injectors and into the engine. I don't see how that is possible. The vacuum lines from the canister connect into the bottom of the throttle bodies. Injectors don't suck, they spray from the top. I can see junk getting sucked into the engine but not the injectors.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  11. #11
    24991 Pauls1150's Avatar
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    I didn't state it correctly:
    The granules get sucked down the hose to the bottom of the throttle bodies, thence up into the fuel flow and into the intake.
    The idea of an in-line filter is interesting, but you'd need to adapt to the change of hose size in at least 4 places.

    Ah yes, those California Arrogant Retarded Bastards... the same appointed folk who decided to put a highly carcinogenic additive into our gas; then when it was discovered that it was leaking thru the underground tanks into the water & soil, they demanded that everybody install new tanks - so costly that they forced many gas dealers right out of business, including several in the "desert crossing" zones.

  12. #12
    Day Dreaming ... happy wanderer's Avatar
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    Now that figures. I wonder what charcoal granules would do after they got sucked into a cylinder. Not anything good I'd imagine.

    California is such a huge market share for auto, truck and bike makers that no matter what regulations are imposed they pretty much have to go along with it or lose that huge market share. So California is really in the driver's seat on safety and environmental legislation and it's consequences whether it makes sense or not.

    It always amazes that the entire population of Canada and California remained very close to equal for quite a few years. But last year Canada was 34.8 million and California is now 38 million.

    Now Canada is one vast country for sure but although California is a very large state, it's still just one state! That is a lot of people...and cars, and trucks and bikes. Impact of scale rules the day I guess.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  13. #13
    24991 Pauls1150's Avatar
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    Typically they weld themselves to a valve seat - a double whammy, since now the valve can't close and the grit is so hot. I've seen photos of the damage (never saw it first-hand, thank goodness), and it sure ain't pretty.

    Yeah, we've got way too many people, especially in the southwest... We really need the San Andreas Fault to let go, and wash it all away with a follow-up tsunami.
    http://www.data.scec.org/recenteqs/

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    Registered User dieselyoda's Avatar
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    Duh, can you express a non technical feeling here?

    If I said any of that stuff about our First Nations Aboriginal People or our Distinct Culture Second Language Citizens, I think I would be given an American Passport and shipped away....................Wait, maybe that's why he went back to the US. He is a US citizen and says stuff like that all the time.
    1997 R1100RT (Restored Basket Case) , 1981 KZ 440 LTD (Restored Basket Case)
    1986 K75S(the beutch), 1993 K1100RS (blown engine), 1997 Chev Short Box (4x4 with an LT1)
    "Life isn't about how fast or how high, it's about how well you bounce."

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    Quote Originally Posted by dieselyoda View Post
    If I said any of that stuff about our First Nations Aboriginal People or our Distinct Culture Second Language Citizens, I think I would be given an American Passport and shipped away....................Wait, maybe that's why he went back to the US. He is a US citizen and says stuff like that all the time.
    Could you make it a little clearer, what your post refers to, so that simple minds like me, know what you are talking about??

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