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Evap removal from V7III

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

  1. Patrick Stirling

    Patrick Stirling Just got it firing!

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    Thought I'd chime in on this thread. I bought s 2019 V7 III Stone Night Pack (phew, long name!) a couple of weeks ago, and have about 550m on it so far. I've suffered the excess vacuum in the fuel tank problem as described by Godfrey several times. Seems worst when the fuel level is low and temps are warm (mid 70s here in Tucson AZ). The first time there was just a slight gasp as I opened the tank to refuel. Second time the bike started running a little rough and sort-of hesitating. I remembered Godfrey's comments, pulled over and opened the gas cap - giant sucking sound! And then the bike ran perfectly again. But then I stopped at our mailboxes to chat with a neighbor, and the bike was a little hard to restart, then ran a bit rough getting home (about 3/4 mile). In the garage I opened the gas cap and got another fairly loud gasp. So either the evap recovery valve or the fuel cap vent isn't working.
    Someone posted a photo of the fuel cap vent assembly, looks like it should allow air into the tank as gas is used.
    Anyway, I think I'll be disabling the evap recovery system sooner rather than later! I've also ordered a pitbull stand, which I think will require removing the canister - although it seems that it could be relocated with zipties.
     
  2. subin

    subin Tuned and Synch'ed GT Contributor

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    Mine is also a 2019 V7 III Night pack and I do notice the air relief sound when I open the gas cap, but the motor has been running fine and I have no issue starting cold around 55 F or warm around 90 F, at low fuel warning ON or near full tank. I am going to remove the canister anyway after the first service.
     
  3. Bert Remington

    Bert Remington Tuned and Synch'ed GT Famiglia

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  4. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    My Pitbull stand works fine without relocating the canister on my 2014 V7 Stone. I also get the heavy vacuum gasp after opening the tank. I haven't gotten any performance issues yet but I also don't want to wait until they develop.
     
  5. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    I have a question or two about disabling the EVAP system on my '14 V7 Stone. The related hoses, as far as I can tell, consist of...

    1) A vacuum line originating at the throttle body air ducting, supplying necessary suction, leading to the EVAP canister
    2) A hose from the EVAP canister that leads to the front of the tank (underneath) - tank vent
    3) A hose from the rear of the tank (underneath) that drains away rain water from the upper lip of the filler cap
    4) A hose from the fuel pump into a "Tee" fitting, leading to the injectors (not related to the evap removal task but mentioned here for clarity)

    A) First question would be - is that correct?

    B) Second question - is all that is really necessary to disable the EVAP system is detatch the throttle body vacuum line? And obviously plug the engine side but probably a good idea to plug the canister side as well. Maybe a 1/4" splice connector that is filled with JB Weld or similar. Hook it back together but effectively plugging the line

    I have tried to follow the thread but this is as best as I can grasp it.
     
    Last edited: Feb 18, 2021
  6. Raymond G

    Raymond G Just got it firing!

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    I just got my V7III 2020 Racer. Is the issue the same for that model as well? Because of the snow I haven't been able to ride it yet. Thanks this is a great resource.
     
  7. Luca Alessandro

    Luca Alessandro Just got it firing!

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    looking to get a Stone S but if not available a Night Pack.

    have you had an opportunity to remove the EVAP yet? If so, would you mind posting details as to how you did it?

    Trying to compile as much info as possible on that EVAP removal, still wrapping my head around the most efficient way to do it.

    Thank you!
     
  8. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    I disabled my EVAP, finally. I just plugged the vacuum line and replaced the one-way check valve with a splice fitting. The one-way valve was not operating properly, I don't think. When I removed the little check valve some really old dark yellow fuel escaped. Looked like it had been sitting there on top of that check valve for quite a while - long enough to turn a dark yellow color. The engine seems to settle much faster when first started, almost immediately. No hunting up and down with the RPMs trying to get settled, it just starts immediately and smoothly gets into a nice idle, ready for departure.
     
  9. Luca Alessandro

    Luca Alessandro Just got it firing!

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    Thats awesome, congrats on a successful mod! I’ve been told getting inspections after the EVAP removal may be difficult depending on where you take your bike. Have you had any issues with this? I can do oil changes myself but never have done Transmission or gearbox oil.

    thanks
     
  10. DeadEye

    DeadEye High Miler

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    Hi,

    The transmission and Rear drive are as simple as an engine oil change.

    Don
     
  11. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    The city I live in doesn't have any emissions testing for passenger vehicles, automobiles included. Plus, I don't plan to live anywhere that doesn't specifically exempt motorcycles. In my region, the only law for motorcycle exhaust is "it must have a muffler" but other areas may be (are) different. It's a risk one takes, modifying exhaust is generally frowned upon by the gubmints, so you have to weigh your risks. In California, they are stricter but we've read here that once it passes, they don't really test them again. There is also the California "Motorcycle Anti Tampering Act" to consider.

     
    Luca Alessandro likes this.
  12. Luca Alessandro

    Luca Alessandro Just got it firing!

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    Had a chance to see your new bike yet? I’m searching for a Stone S too, hope there a few still sitting around
     
  13. Ken Horii

    Ken Horii Just got it firing! GT Contributor

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    Seacoast cycles in New Hampshire have one. Also, Brockton Cycle Center, Brockton Mass. Seacoast cycles offered to deliver a bike to me in RI free. They are a pleasure to deal with. I ended up getting an S from RAZEE in RI at an excellent price, but Seacoast has some Guzzis on sale at great prices.
     
    Luca Alessandro likes this.
  14. Jeff Gemignani

    Jeff Gemignani Just got it firing!

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    Knocked out my SAS delete yesterday and just did my EVAP. I left the EVAP can on to catch any excess fuel.

    Cut the breather line and inserted a simple bolt from Lowes to plug it, used some auto adhesive and screwed it into the rubber line, fit nice and snug and once the adhesive sets should be good to go. Removed the rest of the hose from the EVAP canister, can anyone advise if the opening on the EVAP canister where the breather line was attached should be plugged with a rubber cap?

    Removed the pinch clamps above and below the tip valve and used a barbed coupler I found on Amazon and secured with hose clamps: amazon.com/gp/product/B00BONM4JC/

    The tag for the bolt I used to plug the breather is attached along with photos of the finished lines.

    IMG_2732.JPG IMG_2733.JPG
     
  15. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    If you’re leaving the canister in place, do NOT plug the vent line. You will do what you’re trying to eliminate with tank pressurization.
     
  16. Luca Alessandro

    Luca Alessandro Just got it firing!

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    What size vacuum cap did you use for the manifold.
     
  17. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    I figured that I should post this here, as it pertains to troubles that I originally attributed to the EVAP canister system on my bike.

    Earlier in the thread I mentioned where I disabled the EVAP system, plugged the vacuum line, removed the one-way valve, etc. The main issue I was having was, I kept having either pressure buildup in the tank or vacuum buildup in the tank. Figured without the EVAP system and assuming the one-way valve was acting up as well, everything would work like it should. But I kept having vacuum buildup, or pressure. Thing is, it was neither of those. It was a vent line being melted shut behind the starter. The litte vent hose coming off the front of the fuel tank runs down, passes through the one-way valve going down to the canister. Yep, for whatever reason someone at the factory or someone doing prior work on the bike decided to stuff every fuel line they could behind the starter, cramping everything together and making lines come in contact with the engine, or should I say transmission. The big ol' metal thing that vibrates real hard when the bike is running. Anyway, over time this vent line melted completely shut, and the only way to see it, let alone get to it, was to remove the starter.

    [​IMG]
    [​IMG]

    :mad::(
     
    Last edited: Mar 25, 2021
  18. DeadEye

    DeadEye High Miler

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    Wow !
    #&$@$&)(#@$& annoying - that took a while to figure out.
    When I fooled around with mine it was a real @#$ , moving / removing the lines
     
  19. DominoDoggy

    DominoDoggy Tuned and Synch'ed GT Contributor

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    I kept thinking, something has to be clogged. Can't get any less complex than a vent line, especially once I spliced out that one-way valve. I kept noticing all the lines packed behind the starter, I just kept not wanting to pull it off. Ah well, at least it is fixed now and wasn't expensive to remedy.

    Rainy weather makes for good maintenance days.
     
  20. morpheous

    morpheous Just got it firing!

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    Damn confusing instructions with wierd cuts.....no cutting is required other than near the top of the manifold line. Plug the top hose (manifold side) ,,then simply remove the grey one-way valve on the tank vent tube, and then remove the evap cannister with two hose tails attached (Tank vent bottom hose after valve, and Manifold hose bottom after first cut.) Right? evap-002.jpg evap-003.jpg evap-004.jpg
     
    Last edited: Apr 6, 2021

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