Z900RS

Please login or register.

News: A big welcome to all new members !



Author [NL] [FR] [ES] [DE] [SE] [IT] [NO] [MY] Topic: Idle speed  (Read 16849 times)

0 Members and 1 Guest are viewing this topic.

Offline Contrasens

  • Z900RS Pro
  • ***
  • Posts: 285
  • Bike: Kawa Z900rs
  • Town / City: Leonberg
  • Country: de
Re: Idle speed
« Reply #20 on: June 17, 2018, 01:18:39 PM »
This morning I took a look at the idle speed just after I started the engine (ca. 18°C). With the clutch in, I changed the gears:
1600rpm in the 1st and 2nd
1800rpm in the 3rd
3800rpm in the 4th  :084:

The engine does heat up very fast, so in about 1 km when changing into the 4th there is no kick anymore.

I have ca. 950km on the clock now, next week I am scheduled for the 1000km inspection. I will ask them to see what they think about this...

Offline Y2K18

  • Z900RS Master
  • ****
  • Posts: 647
  • Bike: Kawi Z900RS
  • Town / City: Raleigh, NC
  • Country: us
Re: Idle speed
« Reply #21 on: June 17, 2018, 01:58:41 PM »
*Originally Posted by Contrasens [+]
This morning I took a look at the idle speed just after I started the engine (ca. 18°C). With the clutch in, I changed the gears:
1600rpm in the 1st and 2nd
1800rpm in the 3rd
3800rpm in the 4th  :084:

The engine does heat up very fast, so in about 1 km when changing into the 4th there is no kick anymore.

I have ca. 950km on the clock now, next week I am scheduled for the 1000km inspection. I will ask them to see what they think about this...

Something's not right....

Offline kawasaki_volker

  • Z900RS Junior Member
  • *
  • Posts: 2
  • Town / City: Braunschweig
  • Country: de
Re: Idle speed
« Reply #22 on: June 21, 2018, 03:10:12 PM »
*Originally Posted by Contrasens [+]
This morning I took a look at the idle speed just after I started the engine (ca. 18°C). With the clutch in, I changed the gears:
1600rpm in the 1st and 2nd
1800rpm in the 3rd
3800rpm in the 4th  :084:

The engine does heat up very fast, so in about 1 km when changing into the 4th there is no kick anymore.

I have ca. 950km on the clock now, next week I am scheduled for the 1000km inspection. I will ask them to see what they think about this...

Hi,

same problem here. Could be a surprise (esp. for beginners) when you have sharp corners on the first km  :001:. But in the meanwhile I deal with it.
I think the gear dependent, high rpm is a torque related problem and could be fixed with a software update for a better management of the second (ECU controlled) throttle walve and injection.

@Contrasens: Let us know what your dealer says.....

 

Offline Contrasens

  • Z900RS Pro
  • ***
  • Posts: 285
  • Bike: Kawa Z900rs
  • Town / City: Leonberg
  • Country: de
Re: Idle speed
« Reply #23 on: June 21, 2018, 09:48:32 PM »
They said it's all electronics on this bike, so it must be some feedback control from the oxigen sensor, which tells the ecu to put more gas....dunno, just bu##sh#t. It didn't make sense to me, even that I know well what a feedback control system does and I work in automotive SW development  :010:

I didn't want to insist, since I don't care much about this, it was very warm and was all sweaty and all I wanted was a cool drink while waiting for them to inspect the bike. And the discussion wasn't leading anywhere, since the engine was really hot and was no way for me to reproduce the high idle.

Offline Contrasens

  • Z900RS Pro
  • ***
  • Posts: 285
  • Bike: Kawa Z900rs
  • Town / City: Leonberg
  • Country: de
Re: Idle speed
« Reply #24 on: July 01, 2018, 10:35:57 AM »
Here is a short movie I made:


The idle speed stays around 1600rpm in lower gears, when I change to 4th it goes up to 3000rpm. Then, after a few seconds, one can see that the rpm in 4th goes down from itself.
The temperature outside was 26 degree C, The engine was cold (I drove only ca. 50m from home)

Offline Eki Mot

  • Z900RS Member
  • **
  • Posts: 17
  • Bike: Z900rs café
  • Town / City: Vitré
  • Country: fr
Re: Idle speed
« Reply #25 on: July 03, 2018, 06:38:48 PM »
can we change the idle to cold without it changing the idle to hot?
RIDE YOUR LIFE, LIVE YOUR RIDE

Online OKZ

  • Forum Supporter
  • Z900RS Master
  • *
  • Posts: 906
  • Bike: Multiple bikes
  • Town / City: Edmond, OK
  • Country: us
Re: Idle speed
« Reply #26 on: July 03, 2018, 07:19:45 PM »
*Originally Posted by Eki Mot [+]
can we change the idle to cold without it changing the idle to hot?

yes, see post below, this is the Z900 but is in the same location on the RS. Go to post 9. 

https://www.z900forum.com/index.php/topic,98.0.html
Technology: Man's ability to make simple things complicated.
2018 Z900RS - Hooligan bike
2019 BMW R1250GS - for travel and exploring

Offline Eki Mot

  • Z900RS Member
  • **
  • Posts: 17
  • Bike: Z900rs café
  • Town / City: Vitré
  • Country: fr
Re: Idle speed
« Reply #27 on: July 03, 2018, 07:27:37 PM »
OK, perfect, thank you.
I do that tomorow morning. ✌
RIDE YOUR LIFE, LIVE YOUR RIDE

Offline kawasaki_volker

  • Z900RS Junior Member
  • *
  • Posts: 2
  • Town / City: Braunschweig
  • Country: de
Re: Idle speed
« Reply #28 on: July 03, 2018, 09:04:09 PM »
Hi Eki,

as shown in the video of  Contrasens, there is an increase of rpm which depends to the selected gear. So before you change the position of  the stop screw of the throttle walve, it would make sense to do the same test like Contrasens.
Start engine in cold start modus and shift to the fourth gear. Don't drive. Only shift! If you have the same behavior it would be nice to let us know. In my oppinion this can only be fixed with a software update. The rpm offset to 1900 rpm in N to heat up the exhaust system is Ok. But the additional offset of more than 1000rpm in higher gears ISN'T. It's safety relevant, as yoi can see in this thread https://www.z900rs.co.uk/index.php/topic,639.msg7150.html#msg7150

Offline Eki Mot

  • Z900RS Member
  • **
  • Posts: 17
  • Bike: Z900rs café
  • Town / City: Vitré
  • Country: fr
Re: Idle speed
« Reply #29 on: July 03, 2018, 09:20:25 PM »
Thank you for your help.
My idle cold was at 2200 and 1000 hot.
I want an idle cold at 1800 maximum.
But it's true, tomorow i will verify also the idle at 4th gear next to the bike.
I never ride when it is not hot but i do not want to swim on the ground with my bike 😉
RIDE YOUR LIFE, LIVE YOUR RIDE