Idle issue 2008 250

TS250 · February 2nd, 2014, 09:47 PM

I have a 250 08 ninja, the idle is good when not giving it gas. But once you give it gas and it returns to normal idle it take about3-4 seconds to idle normally(2500 t0 3000 rpms) It does it every time even when fully warmed up. It goes to 1500 and slowly goes to normal. Anyone has the same issue? Is it just the carburated model or does it need some adjustment? Thanks for any input.

corksil · February 2nd, 2014, 09:54 PM

Idle mixture screws.

Sounds like it's a little lean at idle.

There are two idle mixture screws hidden under caps that must be drilled out. I recommend you google "mixture screw ninja 250r"

---- That should pull up the exact link to the ninja faq with detailed instructions.

However it may be smart to wait for a second opinion before taking power tools to your carbs.

mgentz · February 3rd, 2014, 06:34 AM

jetting or vacuum leak.

DaBlue1 · February 3rd, 2014, 07:05 AM

Quote:

Originally Posted by TS250

.... But once you give it gas and it returns to normal idle it take about3-4 seconds to idle normally(2500 t0 3000 rpms)

2500-3000 rpms is not normal idle speed. 1300 +/- 50 rpms is normal for a fully warmed bike. If your idle speed is up to 2500, something is wrong.

Any modifications to your bike? (i.e. carbs work, exhaust , etc...)
Does the bike run OK at 1500 rpms?
Have you tried adjusting the idle speed?

broilmebk · February 3rd, 2014, 09:26 AM

Yea, it's a little confusing when OP is saying 'normal idle' is 2500-3000.
So it is at 1500 and then slowly goes to 'normal'?? 1500 is already above the real normal. Is your choke on?

TS250 · February 3rd, 2014, 03:44 PM

Both the ninjas I have call for idle to be 2500 to 3000. I could be wrong.

broilmebk · February 3rd, 2014, 04:08 PM

Quote:

Originally Posted by TS250

Both the ninjas I have call for idle to be 2500 to 3000. I could be wrong.

Where did you get that from?
Attached is from the service manual for 08+ 250s

mgentz · February 3rd, 2014, 06:31 PM

1300 is ideal.

TS250 · February 7th, 2014, 09:50 PM

Quote:

Originally Posted by broilmebk

Where did you get that from?
Attached is from the service manual for 08+ 250s

Yes you are right I miss read the numbers for both.

February 2nd, 2014, 09:47 PM	#1
TS250 ninjette.org member Name: MARCO Location: OKLAHOMA Join Date: Feb 2010 Motorcycle(s): 2008 NINJA 250, BLACK, 650 NINJA 2009, RED, F 650GS BMW 2012 YELLOW Posts: 94 Blog Entries: 1	Idle issue 2008 250 I have a 250 08 ninja, the idle is good when not giving it gas. But once you give it gas and it returns to normal idle it take about3-4 seconds to idle normally(2500 t0 3000 rpms) It does it every time even when fully warmed up. It goes to 1500 and slowly goes to normal. Anyone has the same issue? Is it just the carburated model or does it need some adjustment? Thanks for any input.

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February 2nd, 2014, 09:54 PM	#2
corksil ninjette.org certified postwhore Name: TC Location: Hawaii Join Date: Sep 2013 Motorcycle(s): A lot. Posts: A lot.	Idle mixture screws. Sounds like it's a little lean at idle. There are two idle mixture screws hidden under caps that must be drilled out. I recommend you google "mixture screw ninja 250r" ---- That should pull up the exact link to the ninja faq with detailed instructions. However it may be smart to wait for a second opinion before taking power tools to your carbs.

February 3rd, 2014, 06:34 AM	#3
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	jetting or vacuum leak.

February 3rd, 2014, 09:26 AM	#5
broilmebk ninjette.org sage Name: Brian Location: Orange County, CA Join Date: Apr 2012 Motorcycle(s): '12 ninja 250r Posts: 762	Yea, it's a little confusing when OP is saying 'normal idle' is 2500-3000. So it is at 1500 and then slowly goes to 'normal'?? 1500 is already above the real normal. Is your choke on?

February 3rd, 2014, 03:44 PM	#6
TS250 ninjette.org member Name: MARCO Location: OKLAHOMA Join Date: Feb 2010 Motorcycle(s): 2008 NINJA 250, BLACK, 650 NINJA 2009, RED, F 650GS BMW 2012 YELLOW Posts: 94 Blog Entries: 1	Both the ninjas I have call for idle to be 2500 to 3000. I could be wrong.

February 3rd, 2014, 06:31 PM	#8
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	1300 is ideal.