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Old 03-31-2013, 05:10 PM   #31
JimVonBaden
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Joined: Feb 2005
Location: Alexandria, VA
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Quote:
Originally Posted by marchyman View Post
Eyeball it. I bet you can guestimate 1 mm. .5mm is half of that.

The point is that there should be some small amount of movement that doesn't cause an RPM change. If you get an RPM change right away you don't have any slack.
I do it like this:

Quote:
Acheiving the required slack is trickier on the R1200 because you can't feel the slack. The only way is to hook up a Twinmax type device and then loosen the cables. Tighten one side until you get a reaction from the Twinmax, then back it off about one full turn. Do the same on the other side and you have both at about 1mm slack.
Works reliably.

Jim :
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Old 04-01-2013, 04:44 AM   #32
Chat Lunatique
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Joined: May 2011
Location: Niagara, Canada
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Quote:
Originally Posted by johnjen View Post
Uh, no, the steppers are an electronic 'stepped' motor that opens (and closes) the idle air bypass circuit. In effect it replaces the Big Brass Air Screw found on the 1100 and 1150 throttle bodies. They electronically (from the fuel injection computer) control the idle for each cylinder instead of it being a fixed amount like the older 1100 and 1150 systems.

Many have reported that 'parking' the steppers is not necessary in order to balance the throttle cables. And while that may be so (I don't have a 1200 to play with this to verify it one way or another) BMW did go to the trouble of providing this function for that reason.

JJ
Thanks John! I had the operating principle mixed up. Thought the stepper moved the throttle plate.
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