GSXR 1000 K5 lumpy idle and stalling - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 03-03-2019, 07:31 AM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
GSXR 1000 K5 lumpy idle and stalling

Hi everyone. Recently bought a K5 with 20k on the clock. Really pleased with it other than it running quite lumpy at idle and sometimes when I put it in 1st gear from neutral at the lights, it stalls. It has a scorpion can, quickshifter and K&N air filter.

Advice has ranged from adjusting the idle speed, getting the throttle valves cleaned through to fitting a power commander or getting an ECU re flash. The latter being about £400!

Any advice would be gratefully recieved
Robmc is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 03-03-2019, 01:41 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,328
Re: GSXR 1000 K5 lumpy idle and stalling

Check that the idle speed and TPS are correctly adjusted. See 2-14 and 4-20 in the service manual but be sure on both that you adjust the primary throttle/sensor and not the nearby secondary. Check the throttle valve synchronization, the valve clearances, and the throttle valve vacuum hoses. A slip-on shouldn't require a PC or re-flash.
BillV is offline  
post #3 of 13 (permalink) Old 03-03-2019, 02:12 PM
Likes Diiiiiiiiiiiiiiicks
 
Just_Nick's Avatar
 
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 3,796
Garage
Re: GSXR 1000 K5 lumpy idle and stalling

Throw that K&N in the trash, check if it has a power commander, and check the TPS. The lumpy idle is usually because the bike is rich, but it's also pretty much characteristic of this bike.
Just_Nick is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 03-03-2019, 02:23 PM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
Thanks very much for the advice so far. It does backfire when I come off the throttle which I guess is an indication that it is running a bit rich too? I’ll try the idle and TPS adjustment, put a standard air filter in and let you know how it goes!
Robmc is offline  
post #5 of 13 (permalink) Old 03-03-2019, 02:55 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,328
Re: GSXR 1000 K5 lumpy idle and stalling

It can backfire if the PAIR system is left in place.

+1 on the K&N.
BillV is offline  
post #6 of 13 (permalink) Old 03-03-2019, 07:14 PM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
What air filter would you recommend guys?
Robmc is offline  
post #7 of 13 (permalink) Old 03-03-2019, 07:53 PM
Likes Diiiiiiiiiiiiiiicks
 
Just_Nick's Avatar
 
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 3,796
Garage
Re: GSXR 1000 K5 lumpy idle and stalling

Stock. Also, do you know when the spark plugs were last changed?
Just_Nick is offline  
post #8 of 13 (permalink) Old 03-04-2019, 01:50 AM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
Well the guy I bought it off 3 weeks ago said they were done 500 miles ago but..... who knows if that’s true or not! I’ll get those done too 👍🏻
Robmc is offline  
post #9 of 13 (permalink) Old 03-04-2019, 02:24 AM
Soberz again
 
Carnage's Avatar
 
Join Date: Jan 2001
Location: was Boston, now Orlando
Motorcycle: 2006 GSX-R1000
Posts: 14,799
Garage
Re: GSXR 1000 K5 lumpy idle and stalling

FWIW I couldn't get my bike to run right with my Scorpion can without the tune. It idled like shit and would stall much the same way at barely 8K miles. Mind you it was smooth sailing until I ripped my stock exhaust off. A PC5 and a day spent with the dyno man solved the problem and I've never looked back.
Carnage is offline  
post #10 of 13 (permalink) Old 03-04-2019, 03:39 AM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
Thanks very much. That’s my worry that it’s going to take a Power Commander and a tune to sort it out....the most expensive option. Steve Jordan Motorcycles has recommended a throttle body clean to see if that makes a difference (I guess it won’t hurt) which is happening on Wednesday. I’ll get them to check the idle and TPS adjustments too. Just ordered a stock air filter and will get rid of the K&N.

Is it worth me getting them to change the spark plugs while they are doing the throttle body?
Robmc is offline  
post #11 of 13 (permalink) Old 03-04-2019, 11:19 AM
Likes Diiiiiiiiiiiiiiicks
 
Just_Nick's Avatar
 
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 3,796
Garage
Re: GSXR 1000 K5 lumpy idle and stalling

Quote:
Originally Posted by Robmc View Post
Thanks very much. That€™s my worry that it€™s going to take a Power Commander and a tune to sort it out....the most expensive option. Steve Jordan Motorcycles has recommended a throttle body clean to see if that makes a difference (I guess it won€™t hurt) which is happening on Wednesday. I€™ll get them to check the idle and TPS adjustments too. Just ordered a stock air filter and will get rid of the K&N.

Is it worth me getting them to change the spark plugs while they are doing the throttle body?
Throttle body cleans are a scam almost 100% of the time.

Why not do the plugs yourself? It's a very simple procedure with multiple tutorials online. They're going to charge you a very hefty amount for something that can be done in an hour. You're already halfway there by swapping the air filter. At that point you just remove the lower half of the airbox with the 8 or so screws, remove a couple things attached to the bottom of the airbox, boom you can swap the plugs.
Just_Nick is offline  
post #12 of 13 (permalink) Old 03-04-2019, 02:07 PM
You should listen to me. No, seriously, listen to me.
 
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Posts: 7,328
Re: GSXR 1000 K5 lumpy idle and stalling

+1 on throttle body cleans being in the same category as engine oil flushes for cars. Unless your TB is filthy, inside and out, it sounds unnecessary. If it is filthy, the entire engine likely needs a cleaning.

Changing the plugs is a way to learn about working on the bike. But there's a fair chance that they're OK. Suzuki recommends replacing at 7500 mi/12000 km. You'll need a spark plug socket and a torque wrench unless you use the tightening angle method. Beware of antiseize, i.e. don't torque if you use any.

A PC & tune is appropriate if you're replacing the entire exhaust. But if you're just adding a slip-on to the OEM headers, it shouldn't be necessary. However UK/EU models originally had a muffler with a cat converter and a different ECM. The ECM difference is generally associated with the immobilizer. But there's a possibility that the fueling maps are also slightly different and a PC may be appropriate (that may explain why the Australian models, which have an immobilizer but no cat, got a different ECM). Note that a dyno tune will optimize power at the expense of gas mileage. Also note that, though you can get away with it right now, there may come a time when a removed cat will be a MOT fail (as it is on cars right now).
BillV is offline  
post #13 of 13 (permalink) Old 03-06-2019, 06:35 AM Thread Starter
Squid
 
Join Date: Mar 2019
Posts: 5
It was a throttle balance that they carried out in the end (they said it wasn’t far out anyway). Also did a fuel tweak, checked the air filter and hoses, cleared down old fault codes and checked recalls had been done. All for £68 so not bad and it now runs sweet as a nut! Particularly pleased it didn’t need an ECU reflash which would have set me back £420.
Thanks for all the advice guys, I really appreciate it.
Robmc is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki GSX-R Motorcycle Forums Gixxer.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Progressively worse cold idle problem (Stalling till warm) Tony SpeedBump 04-05 GSX-R600/750 3 07-06-2018 10:39 AM
Bike stalling at idle, low rpm stumbling? help v6stanger 09-11 GSX-R1000 8 05-18-2014 10:37 PM
2006 GSXR 600 stalling??? need suggestions!! hutch959 06-07 GSX-R600/750 5 02-28-2010 08:36 AM
99 gsxr idle stalling HELP!! old54truckluvr SRADs (97-00 600 and 96-99 750) 2 09-23-2007 09:57 AM
01 gsxr 1000 keeps stalling Gix9703 GSX-R1000 General Forum 6 06-15-2005 10:44 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome