Vboost Not Installed

Discussion in 'VBoost Room' started by Vincent Pecoreno, Dec 12, 2019.

Help Support VMAX Motorcycle Forum by donating:

  1. Dec 12, 2019 #1

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    Hello to all and I am new to this forum and wanted to introduce myself and comment about the wealth of information that I have seen here in the last few days of reading. Great place!. I just purchased a 1985 Vmax that is running but I found that it has an aftermarket device that has a hose that screws into the oil filler cap and runs up below the air box into a canister, then has two small filters coming out of it. The carbs are mounted, and the bike starts but I didn't see the Vmax Vboost system. I went through the parts boxes and found the lower unit that has the butterfly assembly, the control box is still mounted on the left side, but the servo motor is missing. I jumped the gun and bought a complete assembly on eBay. When I plugged the servo into the harness the servo motor didn't cycle through its initial stage, so I am going to test it and the control box this weekend. This is the year, color and the bike that impressed me when I rode it in 1985! I'm 56 now and have always wanted this bike, now I have it. Any help with this setup would be most appreciated as I'm not very sure why this bike has this crankcase breather system on it and why the Vboost was taken off and how it was by-passed. Thanks for listening!
     
    sdt354 likes this.
  2. Dec 12, 2019 #2

    one2dmax

    one2dmax

    one2dmax

    Well-Known Member

    Joined:
    Apr 6, 2006
    Messages:
    15,180
    Likes Received:
    151
    Location:
    Derby Kansas
    Dynojet Stage Seven w/breather kit (and usually requires a full header)
     
  3. Dec 12, 2019 #3

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    Please explain a full header...
     
  4. Dec 12, 2019 #4

    rebeltaz83

    rebeltaz83

    rebeltaz83

    Well-Known Member

    Joined:
    May 8, 2013
    Messages:
    599
    Likes Received:
    111
    Location:
    Anderson, SC
    Complete aftermarket exhaust from the engine to the mufflers. 4 to 1 will gain the most power, 4 to 2 if you like looks of the duel mufflers. Not just slip ons, which is mufflers only on the oem header pipes, don't usually result in any added power, just noise.
     
    sdt354 likes this.
  5. Dec 12, 2019 #5

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    That's what I thought but not on this bike, I want to take this off and put the Vboost back on.
     
  6. Dec 13, 2019 #6

    MaxMidnight

    MaxMidnight

    MaxMidnight

    Well-Known Member

    Joined:
    Dec 1, 2007
    Messages:
    1,762
    Likes Received:
    61
    Location:
    Cumbria, England.
    A good start would be to confirm
    what, if anything, has been done to the carbs.
    Check what jets and needles are fitted, see here.

    The different needles below.
    upload_2019-12-13_9-12-53.png
     
  7. Dec 13, 2019 #7

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    Thanks I will check, the exhaust is stock so I'm wondering what was done here and why the Vboost system was taken off.
     
  8. Dec 13, 2019 #8

    Traumahawk

    Traumahawk

    Traumahawk

    Well-Known Member

    Joined:
    Dec 12, 2011
    Messages:
    7,788
    Likes Received:
    98
    Location:
    Lawton, OK
    In the stage 7 directions dynojet recommends taking the vboost off and putting tubes that come with the kit in place of the vboost butterflies. There have been people in the past that have run a stage 7 kit with vboost and not replaced the butterflies.

    But....if you are still running essentially the stock exhaust.....your better off going back to stock on the carb set up with vboost.....or going with an aftermarket exhaust set up. With the aftermarket exhaust you can put vboost back in place and continue to run the stage 7 kit. You might have to do some tuning on the carbs but this forum has all of the answers that you need and has some great tuners on here as well.
     
  9. Dec 13, 2019 #9

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
     
  10. Dec 13, 2019 #10

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    It Looks more like an engine breather kit not a stage 7 kit, I will take some pic's...
     
  11. Dec 13, 2019 #11

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    Just giving an update, I haven't gotten around to taking pics yet but I think the unit I have installed is an Engine Breather.
     
  12. Dec 14, 2019 #12

    gentsvmax

    gentsvmax

    gentsvmax

    Well-Known Member

    Joined:
    May 24, 2012
    Messages:
    461
    Likes Received:
    53
    Location:
    denver
    That "breather system" and absence of the Vboost could indicate a stage 7, that's why it was suggested to go through your carbs to see how they are set up.
    Who know's, maybe the PO sold the header separately.
     
    Vincent Pecoreno likes this.
  13. Dec 14, 2019 #13

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    I will check the carbs.
     
  14. Dec 14, 2019 #14

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    Is there anyplace on the Internet where pics are posted of this Stage 7 system, All that I'm finding is one's with four K&N filters I don't have these filters only 2 small 1 1/2 inch ones.
     
  15. Dec 15, 2019 #15

    gentsvmax

    gentsvmax

    gentsvmax

    Well-Known Member

    Joined:
    May 24, 2012
    Messages:
    461
    Likes Received:
    53
    Location:
    denver
    Pics will help, are those filter's on two of your four carb's?
     
  16. Dec 15, 2019 #16

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    I took a few pics of this system, there is a canister between the carbs that forks out to 2 little filters and the hose on the other side goes to the oil filler on the right side of the engine.
     

    Attached Files:

  17. Dec 15, 2019 #17

    MaxMidnight

    MaxMidnight

    MaxMidnight

    Well-Known Member

    Joined:
    Dec 1, 2007
    Messages:
    1,762
    Likes Received:
    61
    Location:
    Cumbria, England.
    If I'm understanding correctly the two filters are part of the engine breather system?
    What filtration do you have for the carbs?
     
  18. Dec 15, 2019 #18

    Vincent Pecoreno

    Vincent Pecoreno

    Vincent Pecoreno

    Member

    Joined:
    Dec 4, 2019
    Messages:
    23
    Likes Received:
    2
    I have the standard Vmax airbox. I don't know what aftermarket breather system was installed and to get to it I would have to take off the carbs. If I have to I will to get to the bottom of it...
     
  19. Dec 16, 2019 #19

    gentsvmax

    gentsvmax

    gentsvmax

    Well-Known Member

    Joined:
    May 24, 2012
    Messages:
    461
    Likes Received:
    53
    Location:
    denver
    It looks like the filtered hose with the 90 deg. fitting on it would be the one that attaches to the bottom of your stock air box after you shorten it, put in a tee fitting in order to plumb in that top hose minus its filter. You have the hose's for a breather system Sean sell's, minus the tee fitting you need.
    Search "crank case breather mods" here, you'll get pics and instructions.
    Welcome to the forum and Merry Christmas!
     
  20. Dec 16, 2019 #20

    MaxMidnight

    MaxMidnight

    MaxMidnight

    Well-Known Member

    Joined:
    Dec 1, 2007
    Messages:
    1,762
    Likes Received:
    61
    Location:
    Cumbria, England.
    I suspect what was originally fitted was the Dynojet breather kit.
    When I had mine the internals of the air/ oil separator came loose and in the end I made my own.
    If that also happened on the one you have that could explain the two mini filters.
    What is still a mystery is why was installed.
    I would start by pulling one of the throttle slides to see what needles are fitted.
    Are the tamper proof screws still in place on the carb tops?
     

Draft saved Draft deleted

Share This Page

Group Builder
arrow_white