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Stepper motor on/off kit

Discussion in 'GT Electrical' started by GT-Rx®, Aug 24, 2009.

  1. Martin

    Martin Tuned and Synch'ed

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    A question just to be sure. I've checked the installed valve yesterday for the position of the switch and when I blow trough the hose coming from the airbox, it needs a lot of pressure to blow trough. When I switch from close to open it's more a very little leaking than blowing trough. The question: is this normal/good? :?
     
  2. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    It is good. The valve allows a 1500 RPM idle when on.
     
  3. capdefra

    capdefra Just got it firing!

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    For Todd:
    is the Stepper motor on/off kit also available for a Stelvio ; mine is a Stelvio NTX 2009.

    Franck
     
  4. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Franck, sure is, I'd recommend the Griso/Sport version unless you have a place you'd rather mount the switch. If you have any other questions, ping me direct e-mail; Todd at GuzziTech.com
     
  5. capdefra

    capdefra Just got it firing!

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    Thanks Todd. My Stelvio NTX as only 1600 kms and have no problems with the stepper motor and iddle but I had before a Norge which had erratic iddle because of the stepper motor. So I consider your kit as a good solution for my Stelvio if I have problems like the Norge.

    Franck
     
  6. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Thanks Franck.

    All; I've had a few questions over the last few weeks regarding stepper motor operation & function. The valve is wired such as it is in the off (no power usage)/non-flow position as standing, and when you turn the switch 'on' the power opens the valve to allow air-flow through the valve. The valve is restrictive to air-flow compared to the line diameter, but the valve in the open position allows 1,500 RPM idle when on, and a solid (non fluctuating) 1,200 RPM when off/closed.
    The small holes in diaphragm inside the valve allow the rubber plunger to open and close with delay/bleed. It is not the orifice in which the air travels.

    Hope that helps.

    As of right now, I only have ONE (1) switch housings left for Griso/Sport/Breva/Stelvio applications. I'm not sure when I'll make more, but the kit will remain available for Norge owners.
     
  7. Martin

    Martin Tuned and Synch'ed

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    Thanks for your answer, theoretical I can understand it, but in practice it won't work this way. . . although at my bike. . . I can feel sort of a second step, but still the airflow is minimal.
    This morning I removed the airbox for the third time (I'm getting quicker every time), and it works the same as the first time I installed it: the bike won't idle at all. I have to raise it by hand to keep the engine turning. A small testride tells the same: it makes no difference if the switch is on or off, the engine runs the same. That means no popping at all, while formerly he was popping terrible.
    Formerly the bike was starting perfect, so I think only thing is to look for a valve that opens fully for starting the bike properly.
     
  8. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    The open/on valve should allow a 1500 RPM idle. If you add 12V, you should be able to blow through the valve, not like blowing through an open hose though. If you add power and find this not to be the case, I can send you a new one or refund you my cost of the valve. I tested numerous valves and selected this one because of function and cost. There are other valves out there, but as you'll likely find, the cost of each far exceeds the whole kit.
     
  9. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    All, I'm currently/now sold out of the clutch perch switch holder (shown below with the 'G')... so I can only offer them to Norge owners or anyone willing to make a switch holder for themselves. Cost is $60. I will post again when I have the holder back in stock.

    Also, I've had one request in doing a mirror image as a switch for accessories. Any interest?

    [​IMG]
     
  10. Captain Oversteer

    Captain Oversteer Just got it firing!

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    I'm in for the RH switch mount! But you already knew that.... :lol:
     
  11. GuzziHero

    GuzziHero Cruisin' Guzzisti GT Contributor

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    I love engine braking and I want to disable my stepper motor. Will the Griso 8v switch work on the 4v?
     
  12. GuzziMoto

    GuzziMoto GT Reference GT Contributor

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    It is not model specific. All the big CARC bikes use the same basic stepper motor set up. Only the details like hose routing and switch are different. The stepper motor takes filtered air from the air box and bleeds it into the intake tract when the throttles are closed. This helps maintain a stable idle when cold but it is also used to reduce emissions on decel. That is why it messes with your engine braking. By blocking off the air passages you can prevent the stepper motor from doing this. But since the bike may not want to idle when cold with out it being able to turn it on and off is key. Todds kit does this nicely with a solenoid valve and a switch (but he may be out of the handle bar mounted switches) or you can do it with a manual switch.
    You can even block off the stepper motor with some plugs to see what it will change before you go whole hog with this mod.
     
  13. GuzziHero

    GuzziHero Cruisin' Guzzisti GT Contributor

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    Its cheap enough...I'm buying one :)

    Thanks!
     
  14. GuzziHero

    GuzziHero Cruisin' Guzzisti GT Contributor

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    Right, fitted the kit. Even with my meagre skills I worked it out. It's hard to find a suitable place for the valve on the Griso, thats for sure! I got it sorted though.

    I haven't run it hot yet, will test ride it a little later. Here are a few initial observations:

    1. I didnt have an erratic tickover before, as I have said, I have fitted it so I can get my engine braking back. However with the valve now fitted it IS erratic with the valve open.

    2. Close the valve, idle drops but is steady. Bike takes a little longer to warm up before it'll settle like that.

    These I expected. However:

    3. When I switch off the bike, the fuel pump seems to run a moment after the engine is switched off. This happens whether the valve is open or closed. Is this normal?

    Edit:
    I'm not sure if its the fuel pump now. But something whirrrs for a few seconds after the motor is stopped.
     
  15. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Completely normal, and completely unrelated to the stepper motor.
     
  16. ELDY

    ELDY Just got it firing!

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    Hi Todd
    I'm in for a kit.
    1200 Sport
    Thank you
    Eldy
     
  17. IBNR

    IBNR Just got it firing!

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    Hey, Todd -- any plans to produce any more of these? I'd like to pick one up for my 2009 Norge.

    Thanks!

    Mike
     
  18. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Eldy/Mike, contact me direct email; Todd at GuzziTech.com
     
  19. PhillR

    PhillR Just got it firing!

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    Just fitted a stepper motor cut out to my Norge 2 valve.
    I have two issues if anyone can help
    (1) With the switch in the start position, ie stepper motor in the standard (start) position the bike will not start as it used to, that being, hit the starter and the bike used to start and tickover after turning over a couple of times without touching the throttle
    Now I have to start it and keep the thottle open and hold it so that it doesn't stall, if I don't it will not fire up.
    After the bike has warmed up around 20 miles and I move the switch over to the run position the bike ticks over at 800 rpm.which is fine and I have also lost the backfiring on deceleration.
    (2) The mpg has dropped from 42 mpg to 36 mpg which is abit annoying.
    Are both of these things normal and if not, what can be done to rectify it
    Cheer Phill
     
  20. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    Phill, this is one of mine? Sounds like your stepper motor may not be working. Do you have any error codes? Fuel consumption seems very abnormal as well.
     

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