Hi
From time to time some strange situation occurs and have no logical explanation so must turn to the weiser brains on this forum.
Here is the situation: (no matter engine hot or cold) when you rev for a moment like max rpm and than close throttle fully, when rpm drops it not stay on idling but chocking for moment and dies. This is flustration when you accelrate before crossing and must stop quickly. Thanj you stay on crossing with engine shut down.
Any idea where to dig for seolution?

I would look for an air leak in the Z-tube and around the throttle bodies. 

It could also be a problem with the voltage regulator/brushes on the alternator causing a voltage drop that doesn't provide enough electrical power to keep the engine management systems running.  I had that problem with a 1992 K100RS 16V.  You may see a problem with keeping the battery charged.

I have a 1988 K100RS right now that needs a new regulator.  It doesn't charge the battery unless the rpm is above 3500.

PiotrK100 wrote:Hi
From time to time some strange situation occurs and have no logical explanation so must turn to the weiser brains on this forum.
Here is the situation: (no matter engine hot or cold) when you rev for a moment like max rpm and than close throttle fully, when rpm drops it not stay on idling but chocking for moment and dies. This is flustration when you accelrate before crossing and must stop quickly. Thanj you stay on crossing with engine shut down.
Any idea where to dig for seolution?

This is flustration when we have to guess what moto year and model you own? Maybe good to update your profile

What have you recently done to it?

volador wrote:

PiotrK100 wrote:Hi
From time to time some strange situation occurs and have no logical explanation so must turn to the weiser brains on this forum.
Here is the situation: (no matter engine hot or cold) when you rev for a moment like max rpm and than close throttle fully, when rpm drops it not stay on idling but chocking for moment and dies. This is flustration when you accelrate before crossing and must stop quickly. Thanj you stay on crossing with engine shut down.
Any idea where to dig for seolution?

This is flustration when we have to guess what moto year and model you own? Maybe good to update your profile

What have you recently done to it?

Hi
Sorry for that, but last years I was dealing with more that few bricks. I just love that bikes, despite the fact I own also other bikes. Currently I m working on my friend bike from 1983 year, like the first from production, but the engine was changed for 1989 LT.
 Personaly doing on a new project, mine project, which is totally diferent from others. Generally I'm surrended ny bricks. Can not attach pictures on this forum...

But I have my own group where I do include all pictures from my projects, so if you want to look at that you must send me request. Group CUSTOMMANIA and the picture shows K100 drivetrain so easy to recon.

Fuel injectors?

Petrol tank fuel level/pump connector?

[url=http://www.kforum-tech.com/how-to/Modification for early gas tank.htm]Petrol tank return check valve?[/url]

Throttle position switch?

Never hurts to (when the tank is low) pull out the fuel filter and try to blow through it to make sure that it's not restricting flow.

duck wrote:Never hurts to (when the tank is low) pull out the fuel filter and try to blow through it to make sure that it's not restricting flow.

Installed new fuel filter today. No change

Clearance may be too tight on the exhaust valves or running lean.

Have you eliminated any causes so far? Sometimes just normal service items are the cause like spark plug gaps too wide, leads loose, something like that.

clean and properly seat the LE-Jetronic ECU connector under the seat

many have encountered a loose or improperly seated connector

Valve clearance, done. ECU connection done. Ignition done, Spark plugs done, fuel pump and injectors done. Allmost all have been done already, so I'm a bit confused.

Have you tried disconnecting the TPS? That might help.

(Throttle Position Switch - on the back of the throttle bodies.)

Checked for air leak but....no that is not the reason.
But what I did is I adjust TBS and for now engine is idling droping from high rpm...will check tommorow after longer trip.
Anyway, THANKS to everyone for help!!!!

you owe 2 case of Zywiec to Admins for ongoing support