if i press the starter button whe the bike is idling......

[foliver]

Hi. BMW K75C 1986
if i press the starter button whe the bike is idling, it lower the revs, until the engine stals.

It's supose to rev up, or if it's consuming more fuel, stays at the same revs...i'm right?
What can happens?

[Laitch]

Have you done a tuneup on this thing yet? If you haven't you're on the wrong page. 

[frankenduck]

The start button enriches the mixture.  By pressing and holding it at idle you're probably flooding the engine. (On a bike that runs rich at idle in the first place.)

Solution: Don't press and hold the start button at idle.

[foliver]

Have you done a tuneup on this thing yet? If you haven't you're on the wrong page. 

Hi Laitch, i've done valve clearences, ignition ultrasonic cleaning, cables, sparks, pump ( and other things not related to that).
I don't have touched the throttle bodies.
The bike was running rich before i started the resurrection....

From were can i start, bodies sync?

[foliver]

The start button enriches the mixture.  By pressing and holding it at idle you're probably flooding the engine. (On a bike that runs rich at idle in the first place.)

Solution: Don't press and hold the start button at idle.

jajaja, you seems right, cause the bike runned rich from the first time i got it some years ago.

In the previous answer i've described what has been done, were do you think i can attack to achieve a good balance? ( not a rich one).
The bike was not eficient on gas ( 12km/liter in highway) , now i'm post consumption in some days..

[Laitch]

I don't have touched the throttle bodies.
The bike was running rich before i started the resurrection....From were can i start, bodies sync?

You should synchronize the throttle bodies. The Mighty Gryphon will show you how to make an effective manometer out of bottles, tubing and scrap wood.

[Laitch]

Click on this link for instruction and explanation.

[foliver]

Click on this link for instruction and explanation.

This is a good gift.
Thanks!!