idle issue

PEN25 · June 24th, 2013, 02:25 PM

having issues with my 01. starts fine and idles fine until i ride. the rpm's dont seem, to want to come down from 5k as i have the clutch engaged or in neutral until i adjust the idle screw. then i have to turn it a 1/4 turn to restart. if i ride it again i have to turn it a turn or so down then have to turn it a turn back again. doesnt seem to have anything hung up on my cables.

the other thing i have an issue with is it is slow to drop rpm after coming off the throttle. takes about 10 seconds to come down to 1500rpm's. I did pull the carbs apart to clean the float bowls and a quick spray down when my petcock needed rebuilt. outside of that it runs great with no stumble

Motofool · June 24th, 2013, 02:49 PM

That happens when the engine sucks extra air from some leak between the intake valve and the carburetor.

PEN25 · June 24th, 2013, 07:13 PM

Quote:

Originally Posted by Motofool

That happens when the engine sucks extra air from some leak between the intake valve and the carburetor.

interesting. ill have to rip my tank off and look again. i thought for sure i had the boots on correctly. could it be i got one of the vacuum lines on wrong?

Motofool · June 25th, 2013, 05:44 AM

Yes, it could be a crack on a vacuum hose.

Spray some carburetor cleaner over the area while the engine is idling.

Any change in rpms' should indicate where the leak is at.

notsofast · June 26th, 2013, 05:52 PM

Quote:

Originally Posted by Motofool

That happens when the engine sucks extra air from some leak between the intake valve and the carburetor.

Could you elaborate a bit for me? I am having this problem as well, almost to the "T" in fact. At least she runs now!

Thanks!!

Motofool · June 27th, 2013, 04:28 AM

When the intake valves open, the piston is going down, creating vacuum to suck a mix of air and gasoline from the carburetor.
Any leak in between will cause excess of air being introduced into the cylinder.

notsofast · June 27th, 2013, 04:53 PM

Ah, thank you. I wonder if this may have something to do with my petcock vacuum hose...

notsofast · June 28th, 2013, 12:55 PM

So, I discovered that my petcock vacuum fitting is loose... Meaning the little piece of brass tubing comes out pretty freely...I cannot seem to get it out of the hose (gunked up pretty bad).

Could this fitting not...fitting...properly cause the above idling issues as well?

Any tips for getting it to fit air tight again?

Thanks!!!

Fit! lol

Lychee · June 28th, 2013, 03:41 PM

Yes, air can leak in around the brass. Try the carb cleaner trick at idle to see if the rpms raise. That would be a give away.

PEN25 · June 30th, 2013, 02:04 PM

fixed it. tried the carb cleaner trick and nothing changed. no loose rubbers. wasnt sure about vacuum lines on the carbs since the pictures i took some how didnt take. anyway dropped the carbs off used a youtube video http://www.youtube.com/watch?v=zgt3LQKIwVg to figure out i had frogged the first vac line that bridges the two carbs together with the larger line that goes in the center high location. after running new lines and putting them in the right spot i have great response on the throttle. thx for suggesting vac leak.

Motofool · June 30th, 2013, 02:14 PM

Quote:

Originally Posted by PEN25

fixed it. ......... thx for suggesting vac leak.

You are welcome

June 24th, 2013, 02:25 PM	#1
PEN25 ninjette.org member Name: phil Location: tulsa Join Date: Jun 2013 Motorcycle(s): 2001 ex250 Posts: 15	idle issue having issues with my 01. starts fine and idles fine until i ride. the rpm's dont seem, to want to come down from 5k as i have the clutch engaged or in neutral until i adjust the idle screw. then i have to turn it a 1/4 turn to restart. if i ride it again i have to turn it a turn or so down then have to turn it a turn back again. doesnt seem to have anything hung up on my cables. the other thing i have an issue with is it is slow to drop rpm after coming off the throttle. takes about 10 seconds to come down to 1500rpm's. I did pull the carbs apart to clean the float bowls and a quick spray down when my petcock needed rebuilt. outside of that it runs great with no stumble

June 24th, 2013, 02:49 PM	#2
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	That happens when the engine sucks extra air from some leak between the intake valve and the carburetor. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

June 25th, 2013, 05:44 AM	#4
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	Yes, it could be a crack on a vacuum hose. Spray some carburetor cleaner over the area while the engine is idling. Any change in rpms' should indicate where the leak is at. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

June 27th, 2013, 04:28 AM	#6
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	When the intake valves open, the piston is going down, creating vacuum to suck a mix of air and gasoline from the carburetor. Any leak in between will cause excess of air being introduced into the cylinder. __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí

June 28th, 2013, 03:41 PM	#9
Lychee sail away Name: Jon Location: San Jose Join Date: Jul 2012 Motorcycle(s): gixxer (sold), ninjette (upgrade!) Posts: 964 Blog Entries: 8	Yes, air can leak in around the brass. Try the carb cleaner trick at idle to see if the rpms raise. That would be a give away. __________________________________________________ Unregistered found this post helpful. Track Day Preparation Checklist 1. Financial 2. Mental 3. Physical 4. Gear / Bike

June 27th, 2013, 04:53 PM	#7
notsofast ninjette.org member Name: Jon Location: California Join Date: May 2013 Motorcycle(s): 2005 Ninja 250 Posts: 151	Ah, thank you. I wonder if this may have something to do with my petcock vacuum hose...

June 28th, 2013, 12:55 PM	#8
notsofast ninjette.org member Name: Jon Location: California Join Date: May 2013 Motorcycle(s): 2005 Ninja 250 Posts: 151	So, I discovered that my petcock vacuum fitting is loose... Meaning the little piece of brass tubing comes out pretty freely...I cannot seem to get it out of the hose (gunked up pretty bad). Could this fitting not...fitting...properly cause the above idling issues as well? Any tips for getting it to fit air tight again? Thanks!!! Fit! lol

June 30th, 2013, 02:04 PM	#10
PEN25 ninjette.org member Name: phil Location: tulsa Join Date: Jun 2013 Motorcycle(s): 2001 ex250 Posts: 15	fixed it. tried the carb cleaner trick and nothing changed. no loose rubbers. wasnt sure about vacuum lines on the carbs since the pictures i took some how didnt take. anyway dropped the carbs off used a youtube video http://www.youtube.com/watch?v=zgt3LQKIwVg to figure out i had frogged the first vac line that bridges the two carbs together with the larger line that goes in the center high location. after running new lines and putting them in the right spot i have great response on the throttle. thx for suggesting vac leak.

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