BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


1Back to top Go down   Throttle stop screw Empty Throttle stop screw on Fri Mar 03, 2017 8:14 am

Puccini

avatar
Silver member
Silver member
On the 85 K100, is the throttle stop screw on the end of the shaft from the butterflys also part of the idle adjustment?

Some people say it is and others say it shouldn't be used for that. Only the 4 adjusting screws on the throttle bodies should be used for idle adjustment.

If it is not supposed to be used for idle adjustment, what is the proper adjustment procedure for it?

    

2Back to top Go down   Throttle stop screw Empty Re: Throttle stop screw on Fri Mar 03, 2017 8:35 am

RicK G

RicK G
VIP
VIP
On the 85 K100, is the throttle stop screw on the end of the shaft from the butterflys also part of the idle adjustment?
No that is an adjustment for the choke or fast idle. The throttle stop is between #2 & #3.

Only the 4 adjusting screws on the throttle bodies should be used for idle adjustment. That's correct.



If it is not supposed to be used for idle adjustment, what is the proper adjustment procedure for it? 



To get the correct setting on the throttle bypass screws and the MAF bypass you need to open the MAF bypass so as to let heaps of air in then set the throttle bypass screws with vacuum gauges or mercury manometer once they are set and the idle is at 950rpm (the vacuum reading is not important but they should be all the same) you then screw the MAF bypass screw SLOWLY until the engine falters then out SLOWLY till it picks up (about 1/4 turn) that way the barn door flap opens as soon as the throttle is opened.
If you are getting #4 not playing the game then I would suspect the butterflys are not synchronized. There are many threads that say DON"T TOUCH THE BUTTERFLY SETTINGS, that was all very well when they were near new but wear and tear makes it necessary.
You need to have them off the bike and set the backstop screw so that a piece of magnetic audio tape can just be drawn through the opening then adjust the rest till the same and back off the backstop screw till it hits the stop when the butterflys are closed fully and leave the backstop there as it is NOT an idle adjustment.
Idle speed adjustment is done by opening or closing the throttle bypass screws.




Tip:- don't use the choke/fast idle as a stop/reference point to sync the butterflys ONLY use the throttle stop screw.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down   Throttle stop screw Empty Re: Throttle stop screw on Fri Mar 03, 2017 8:38 am

RicK G

RicK G
VIP
VIP
The main purpose of the throttle stop is to have a stop so the butterflys are not actually being used for a stop and wearing out the bore of the body.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum