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Evap removal from V7III

Discussion in 'V7/V85/V9 Chat & Tech' started by Godfrey, Oct 17, 2017.

  1. Godfrey

    Godfrey High Miler GT Famiglia

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    ... slip ons, SAS removal, EVAP removal, a good ECU map to suit...

    Pretty much the same as what I've done, and all the V7III Racer needs engine-wise far as I'm concerned. :)

    The next stage of performance improvements after that is to overhaul the front suspension and fit a better set of tires to get the bike working and handling the way it ought to. I went the extra mile with the fancy Kineo wheels, because I'm like that, but sorting the suspension and putting something better than the Pirellis on there is the important part.
     
  2. Jkd

    Jkd Just got it firing!

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    Thank you Godfry for the detail – clearly sufficient for most folks to understand.
    Want to be sure I understand this specific piece -
    “- cut vacuum line and block it (I glued an aluminum slug in place)
    Follow the line and cut it in a convenient place, then block it ... particularly the upstream side that comes from the inlet manifold.”

    Is it in fact removing a small section of the vacuum line and installing a slug to block/bridge the new gap in the line with nothing else to do in the attached picture? (I understand the later breather valve steps.)

    Thanks!
     

    Attached Files:

  3. Godfrey

    Godfrey High Miler GT Famiglia

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    The whole point of this step is to block the vacuum tap on the inlet manifold safely. You could just pull the line off the manifold tap and fit a rubber plug there, but the problem with that is that unless it fits very tightly or is glued/clamped on securely, a little backfire or other pop-back through the intake could blow it off and leave you with a massive (unrideable) vacuum leak on the road. I didn't have the time or patience to take the line off, remove the tap, and thread the hole for a secure plug when I did the job, so I cut the line about six-seven inches from the tap and glued a tight-fitting slug in securely. That way, the line has some flex to it that will absorb any backfire or pop-back without blowing the plug or line off the tap.

    The rest of the line just goes down to the canister to provide a small amount of vacuum so it draws gasoline vapor from the fuel tank ... completely unnecessary IMO, So I've now just removed that portion of the line entirely, along with the entire EVAP canister. The line from the fuel tank vent to the canister I've extended another six inches so it hangs down just under the starter. Configured this way, the fuel tank vent is just like the one that was on my '89 LeMans V. :)

    One of these days, I'll go back in there, remove the line with the plug, remove the tap from the manifold, thread the manifold for a steel or brass threaded plug, and glue a permanent plug on the manifold. But it's just an aesthetic desire to clean up the under tank looks and tubing at this point, since it works just fine as it is.
     
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  4. Jkd

    Jkd Just got it firing!

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    Thank you! Finished last night along with the SAS block off kit.
     
  5. omin00b

    omin00b Just got it firing!

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    So I did my EVAP delete and i think gas is leaking --- yesterday my gas light came on and I filled up at the gas station and it was only at 154 miles.
    I noticed it dripped a little from the breather hose this morning b/c I filled it to top but I'll stop filling so much next time.
     
  6. Godfrey

    Godfrey High Miler GT Famiglia

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    I fill the tank until the fuel touches the bottom of the filler opening's spacer cage. That gives the tank the required amount of minimum air volume needed for venting without pushing fuel down the vent line. :)

    The nominal capacity of the tank is 5.5 US gallons. About 0.25 gallon of that capacity is the minimum air space required for venting properly. My "low fuel" light always comes on, and stays on, when I can fit just about exactly 4 US gallons of fuel into the tank, with the fuel just touching the bottom of the spacer cage. My mileage at that point is almost always 200 miles, plus or minus 5 miles or so, for a measured fuel economy of 47 to 51 MPG.

    G
     
    Last edited: May 2, 2019
  7. Roose

    Roose Tuned and Synch'ed

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    My V7III is doing the same mileage. Can't recall any leaks either. 2>1 Exhaust, evap removal and SAS block off. Nice 350 miles in one day average 48. Ran hard in the foothills of Appalachia, Daniel Boone National Forest.
     
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  8. RAYT

    RAYT Tuned and Synch'ed

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    I have a 2018 Carbon DK and installed GT Megs and the SAS kit the end of last year (2018).
    I had the mapping "Flash" done for fueling. The bike runs great.
    I have been reading the forum again today on the installation of the SAS kit and have some further questions regarding vacume to anyone who can answer them.
    I had already removed the canister and plugged in the SAS. I have also plugged the two hoses in the photos one from the canister and the other from the manifold what I read before.
    I'm told that only one of the hoses should have been plugged and the other left open, because when I take off the gas cap there is vacuum.
    The hose from the manifold still has the breather attached inline. (see photo)
    Should I cut above the breather and plug it there?
    Therefore there would be no need for the remaining line plugged hanging under the bike.
    Fast forward to today... I don't want to further start cutting lines if I don't need to.
    I know the 2018 V7's have been tweaked the way they build them at the factory to cut costs a little here and there from what I've been hearing, so what I read in the past may or may not apply to the 2018's.

    IMG_3437.jpg

    Tank Breather Valve.jpg
     
  9. V700Steve

    V700Steve High Miler GT di Razza Pura

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    I would just get rid of all the hoses and either cap the barb on manifolds or run a line from one to anther. I guess you need to connect it for inspections. The ones from tank are open to underside of bike.
     
  10. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Steve, this is a single throttle body V7.

    Ray, that tip valve should be gutted or removed, and should go to free air. It cannot be blocked.
     
  11. RAYT

    RAYT Tuned and Synch'ed

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    Thanks for the info Steve, I followed one of the lines to the breather vent valve which I will remove from the line.
     
  12. RAYT

    RAYT Tuned and Synch'ed

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    "Tip Valve" meaning breather valve in photo? Yes I agree. Thanks Todd.
     
  13. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Yep. ;)
     
  14. RAYT

    RAYT Tuned and Synch'ed

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    while working on my breather hose I just noticed behind the left side cover (2) see through plugs from the air box.
    one of them has been rubbing against the hose straight from the factory and has fluid and or white grease in it.
    It may may have a tiny hole in it, leaking down the hose I am removing from the breather valve.
    any suggestions? thanks. :smirk:

    air box1.jpg
     
  15. RAYT

    RAYT Tuned and Synch'ed

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    another visual, close up.

    air box2.jpg
     
  16. V700Steve

    V700Steve High Miler GT di Razza Pura

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    That looks like an airbox drain.
     
  17. V700Steve

    V700Steve High Miler GT di Razza Pura

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    Last edited: May 14, 2019
  18. RAYT

    RAYT Tuned and Synch'ed

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    Hmm, I'll look into it. I finished cleaning it up last night. thanks for the info!
     
  19. RAYT

    RAYT Tuned and Synch'ed

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    Why would there be any fluid and/or white grease in the air box drain on a new bike?
     
  20. Kevin.NZ

    Kevin.NZ Cruisin' Guzzisti

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    oil mist mixed with water vapour
     

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