Issues returning to idle

TMAC · 5/21/17, 8:38 PM

The motor is a 2012 R1 on a Rosson injection system with a PC V and auto tuner as well as an accumulator. With the first start up you can free rev the engine and it will return to idle. The motor will idle fine on start up. Once engine is "warm" and oil pressure drops, the motor will not return to idle after free rev and just cuts out. I've tried different maps, different fuel pressures, and everything else I can think. I was hoping someone maybe has had this issue and has a fix for it or knows of someone who could take a look at it. We are trying to sellout and need to get the car running right ASAP. Any help would be greatly appreciated

jjones752 · 5/22/17, 1:38 PM

I hope you get a response; I'm having similar issues with a GSXR, same setup except no auto-tune (and the PC-V is currently unhooked). Once up to temp idle will often "hang" at around 4500, then settle back down, but will sometimes then die, and I have to cycle the ignition switch to fire back up. Runs fine at speed though.
If I get someone to figure it out through other channels I'll post here.

ernart3 · 5/22/17, 11:07 PM

Sounds to me like you need to adjust valves

goforit14 · 5/23/17, 9:59 AM

I have similar issue with GSXR with PC V. Once warm and crack throttle sometimes it dies. I found out thru leak down test some valves were leaking. Getting that fixed now and I will post results when I get it together..

Plumbcrzy · 6/12/17, 7:46 AM

If you have a Rosson injection on the back side near the bottom injectors there is a small (flat Head)screw for each valve. These need to be adjusted and I'm willing to bet that you have some that are completely closed and maybe some open a little bit. Screw them all the way in and then back each one out the same turns. Right now on my 13 R1 I have mine 2 full turns out. You may need to play with it a little bit but this is what we found that solved the cut out after revving issue.

5/22/17, 1:38 PM	#2 Re: Issues returning to idle
jjones752 Senior Member Race Count This Year: 19 Race Count Last Year: 22 Join Date: Jul 2011 Posts: 2,259	I hope you get a response; I'm having similar issues with a GSXR, same setup except no auto-tune (and the PC-V is currently unhooked). Once up to temp idle will often "hang" at around 4500, then settle back down, but will sometimes then die, and I have to cycle the ignition switch to fire back up. Runs fine at speed though. If I get someone to figure it out through other channels I'll post here. __________________ Jim Jones Midwest Thunder Speed2 Midget #97 _________________________________________________ Last edited by jjones752; 5/22/17 at 1:43 PM.

5/21/17, 8:38 PM	#1 Issues returning to idle
TMAC Member Join Date: Apr 2015 Posts: 25	The motor is a 2012 R1 on a Rosson injection system with a PC V and auto tuner as well as an accumulator. With the first start up you can free rev the engine and it will return to idle. The motor will idle fine on start up. Once engine is "warm" and oil pressure drops, the motor will not return to idle after free rev and just cuts out. I've tried different maps, different fuel pressures, and everything else I can think. I was hoping someone maybe has had this issue and has a fix for it or knows of someone who could take a look at it. We are trying to sellout and need to get the car running right ASAP. Any help would be greatly appreciated

5/22/17, 11:07 PM	#3
ernart3 Member Join Date: Apr 2009 Posts: 126	Sounds to me like you need to adjust valves

5/23/17, 9:59 AM	#4 Re: Issues returning to idle
goforit14 Member Join Date: Jan 2013 Posts: 96	I have similar issue with GSXR with PC V. Once warm and crack throttle sometimes it dies. I found out thru leak down test some valves were leaking. Getting that fixed now and I will post results when I get it together..

6/12/17, 7:46 AM	#5 Re: Issues returning to idle
Plumbcrzy Member Join Date: Apr 2014 Posts: 18	If you have a Rosson injection on the back side near the bottom injectors there is a small (flat Head)screw for each valve. These need to be adjusted and I'm willing to bet that you have some that are completely closed and maybe some open a little bit. Screw them all the way in and then back each one out the same turns. Right now on my 13 R1 I have mine 2 full turns out. You may need to play with it a little bit but this is what we found that solved the cut out after revving issue.