RentAGuzzi Motorcycle Rentals & Tours – Los Angeles CA
  1. Ciao Guest, Happy 2019! Note all of our products and custom bike builds are now on our sister site; You may need a new username and password to get into the new GTM Store system - pending and past order info is available there. NOTE: We are not Amazon, we are a tiny one man operation. Thanks for your patience on orders. GuzziTech is now back to our origins; Enjoy the Guzzi Community Forum and Resources here. There is zero tolerance on personal attacks and off-site links to other Forums or competing products. Note there's decades of Guzzi hands-on experienced help on this site, all whom give endless amounts of their time for free - be courteous. For those who are new here, the owner of this site (Todd - GT-Rx®) has been immersed in Guzzis since 1999. He's raced and wrenched for two-thirds of his life, both Pro dirt-track and road-race, and contributed to Cycle World Magazine from 2000 until 2007. He began Guzzi dyno performance modifying and fuel tuning in 2001, and has been wrenching them full time since 2007. His GT MotoCycles workshop has been open for ~4 years in Orange, CA. We do not have a phone number for this site or GTM, we're online only... do not ask us to call you. Click on the Service tab above for more info or to book an appointment -- it is not a retail shop to visit. If you're in L.A., you can come sample our work via our rental fleet - click the image link above. In a few short years will hit the 20 year mark of providing advice and tech tips for free. Understand that this is a privately paid for website, not a free social media platform littered with ads to help pay for it. Donations appreciated via the Account upgrade (see Site Support section below) or the Donate tab above, which unlocks all of the content here along with the Classifieds, Ask the Wrench sections and our Seasonal discount notices. Thank you for all of the continued support and contributions.

Una Storia Steppermotoria...

Discussion in 'BNS12 Chat & Tech' started by Nordicnorm, Jan 28, 2016.

  1. Nordicnorm

    Nordicnorm Cruisin' Guzzisti GT Contributor

    May 12, 2011
    Likes Received:
    Vancouver Island BC
    Much has been posted about this item. I would like to share my own experience, based on an '06/'07 B11.
    With the tank, and airbox off, you have access to this little bundle of hate and frustration (for some).
    If it has acted up, pull the electrical connector off, and remove the motor from it's bracket.
    The electrical connector has 4 pins in a row. #1 and 4 (the outer ones) should read about 50 ohms with a multimeter. Same for the two inner ones (2 and 3). If it fails this test, you probably need a new one.
    Make sure the contacts are clean and sound.
    Now, holding it in your hand, plug it back in.
    Look through the x-pipe that feeds the two throttle bodies. You should have a clear view.
    Turn the ignition on. A small plunger will appear slightly into view from the motor side. This is the cold start position (max air to the throttle bodies for a high idle).
    Turn the ignition off. The plunger will run through it's full range of motion, all the way in to a tapered orifice, (the Min Air position, for full operating temperature), and then retract fully, out of sight.
    You can hear this if you listen carefully after a shut down.
    It draws air from the filtered side of the air box, but just as the throttle bodies get dirty, so will this little guy.
    Here is your chance to clan and lubricate it when you do the inner spark plugs, or whatever.
    Cycle it a few times and spray cleaner/lube into the x-pipe, then blow it out with compressed air.
    Put it all back together, making sure the supply hose from the air box is connected to the fitting at the bottom of the air box . You will get some fault codes that you need to clear from the dash, when you turn the ignition on.

    Running without the stepper motor:
    My bike came to me diagnosed with a "failed stepper motor". I bypassed the stepper with a balance pipe between the throttle bodies, with a plug in the middle, so no air could migrate back and forth, and left the motor connected to the wiring harness in order to prevent a fault code, then opened the throttle bypass screws, as you would on the previous generation of FI.
    Opening the bypass screws(and balancing the TBs) in the area from 120 to 200 degrees, would give me a nice steady idle in one minute or slightly less, with no issues as long as I was running.
    On a quick turn-around (gas station), I had to nurse the idle for 10 seconds or so, till the ECU found its groove, then no issues.
    Over time I discovered the issue was fouled injectors, from long time storage, and had nothing to do with the stepper. That is when I first lubed the motor, and re-connected it (35,000km). I now show 65,000km, and the stepper motor has never once given me a moment of grief.
    This fall, I did the inner plugs and alternator belt, and re lubed the stepper motor while I was in there.
    In the spirit of sharing information (this site has been invaluable to me), I hope someone will find this information useful.
    Nick, supercruiser and GT-Rx® like this.
  2. Oz1200Guzzi

    Oz1200Guzzi High Miler

    Sep 14, 2009
    Likes Received:
    Mount Kembla, NSW, Australia
    Awesome, thanks NordicNorm

Share This Page