04 stuttering

RichNinja1880 · April 24th, 2013, 11:25 AM

Just bought a 2004 with 6500mi really clean. Has one issue between 6250 and 8000rpm the bike feels like I'm hitting the brakes on and off. Above and below its fine no problems. Any ideas ?

Motofool · April 24th, 2013, 11:28 AM

Quote:

Originally Posted by RichNinja1880

..........the bike feels like I'm hitting the brakes on and off......

Welcome to the site, Rich !!!

How quickly?

ManOfGod · April 24th, 2013, 11:29 AM

Quote:

Originally Posted by RichNinja1880

Just bought a 2004 with 6500mi really clean. Has one issue between 6250 and 8000rpm the bike feels like I'm hitting the brakes on and off. Above and below its fine no problems. Any ideas ?

I have a similar issue between 7-9. I would describe it as bogging. So far I haven't tried anything to fix it, but I will be cleaning the carbs soon; we'll see if that helps.

Motofool · April 24th, 2013, 11:51 AM

In that rpms' range bogging seems to be related to the diaphragms / needles:

http://www.dansmc.com/carbs2.htm

csmith12 · April 24th, 2013, 12:11 PM

Welcome Rich!

I think Motofool is pointing you in the right direction. You both sound a bit lean but each bike is different.

Ensure a clean carb first the, shim those needles/move clip down one and give it a try again.

Let us know.

RichNinja1880 · April 24th, 2013, 06:25 PM

I will def clean the carb either this or next weekend. And I have read about shimming the needle but what clip were u talking about? And any suggestions for where to start with shims. No mods yet or probably this season.

fishdip · April 24th, 2013, 06:38 PM

I kind of had a tugging feeling on the ninja 250 when I first got it after syncing the carbs and doing a valve job along with a new chain it no longer tugs like im pushing the brake and letting of over and over. I have no idea what fix it as I did all 3 at the same time sorry.

csmith12 · April 24th, 2013, 08:13 PM

Quote:

Originally Posted by RichNinja1880

I will def clean the carb either this or next weekend. And I have read about shimming the needle but what clip were u talking about? And any suggestions for where to start with shims. No mods yet or probably this season.

The clip is if you have a jet kit. If you are stock you're stock, it will not apply. Start with 2 washers, test ride, then try 3. Do your test rides with the bike fully warmed up.

csmith12 · April 24th, 2013, 08:14 PM

Quote:

Originally Posted by fishdip

I kind of had a tugging feeling on the ninja 250 when I first got it after syncing the carbs and doing a valve job along with a new chain it no longer tugs like im pushing the brake and letting of over and over. I have no idea what fix it as I did all 3 at the same time sorry.

A fouled plug can can cause the same issue.

choneofakind · April 24th, 2013, 10:56 PM

Quote:

Originally Posted by RichNinja1880

Has one issue between 6250 and 8000rpm the bike feels like I'm hitting the brakes on and off. Above and below its fine no problems. Any ideas ?

Does this issue only show up during constant speed, constant throttle scenarios? If so, pull the slides out and see if the air hole on the bottom has been drilled out. The other way of drilling slides involves drilling a tiny third hole, so look for a tiny third hole as well.

I ran into problems like like you describe when I experimented with drilling the slides for faster throttle response. I epoxied the tiny third holes shut and never had problems again.

Motofool · April 25th, 2013, 09:04 AM

Quote:

Originally Posted by choneofakind

Does this issue only show up during constant speed, constant throttle scenarios? If so, pull the slides out and see if the air hole on the bottom has been drilled out......

Here you have some pics only for reference:

http://www.ninjette.org/forums/showt...hole+diaphragm

Very good point, Chone !!!

RichNinja1880 · June 30th, 2013, 12:47 PM

so i know it took forever but life gets in the way i pulled the carbs yesterday no mods not rly dirty but i took them apart and sprayed everything down.

i put a washer under the needles put everything back together and it will idle cold or warm but once i ride it or rev it up a little it will stall when i let off. runs awesome above 5k.

anyone have any ideas?

i currently have the idle mix screws at 2 turns out

agentbad · July 3rd, 2013, 07:25 AM

If you are running bone stock then you shouldn't need to shim the needles. I would change the plugs before anything with NGK plugs and see if that helps. My guess is either some of your jets are still clogged or your carbs just haven't been properly synced. Also the manual says you should get your valves checked at 6000 miles so keep that in mind.

April 24th, 2013, 11:25 AM	#1
RichNinja1880 ninjette.org newbie Name: Rich Location: South Jersey Join Date: Apr 2013 Motorcycle(s): 04 ninja 250 Posts: 3	04 stuttering Just bought a 2004 with 6500mi really clean. Has one issue between 6250 and 8000rpm the bike feels like I'm hitting the brakes on and off. Above and below its fine no problems. Any ideas ?

April 24th, 2013, 11:51 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	In that rpms' range bogging seems to be related to the diaphragms / needles: http://www.dansmc.com/carbs2.htm __________________________________________________ *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

April 24th, 2013, 12:11 PM	#5
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Welcome Rich! I think Motofool is pointing you in the right direction. You both sound a bit lean but each bike is different. Ensure a clean carb first the, shim those needles/move clip down one and give it a try again. Let us know. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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April 24th, 2013, 06:25 PM	#6
RichNinja1880 ninjette.org newbie Name: Rich Location: South Jersey Join Date: Apr 2013 Motorcycle(s): 04 ninja 250 Posts: 3	I will def clean the carb either this or next weekend. And I have read about shimming the needle but what clip were u talking about? And any suggestions for where to start with shims. No mods yet or probably this season.

April 24th, 2013, 06:38 PM	#7
fishdip ninjette.org certified postwhore Name: Fish Location: co Join Date: Apr 2013 Motorcycle(s): 250/300 Posts: A lot.	I kind of had a tugging feeling on the ninja 250 when I first got it after syncing the carbs and doing a valve job along with a new chain it no longer tugs like im pushing the brake and letting of over and over. I have no idea what fix it as I did all 3 at the same time sorry.

June 30th, 2013, 12:47 PM	#12
RichNinja1880 ninjette.org newbie Name: Rich Location: South Jersey Join Date: Apr 2013 Motorcycle(s): 04 ninja 250 Posts: 3	so i know it took forever but life gets in the way i pulled the carbs yesterday no mods not rly dirty but i took them apart and sprayed everything down. i put a washer under the needles put everything back together and it will idle cold or warm but once i ride it or rev it up a little it will stall when i let off. runs awesome above 5k. anyone have any ideas? i currently have the idle mix screws at 2 turns out

July 3rd, 2013, 07:25 AM	#13
agentbad ninjette.org sage Name: bob Location: Earf Join Date: Apr 2013 Motorcycle(s): 2005 Ninja 250, 2006 SV650N Posts: 642	If you are running bone stock then you shouldn't need to shim the needles. I would change the plugs before anything with NGK plugs and see if that helps. My guess is either some of your jets are still clogged or your carbs just haven't been properly synced. Also the manual says you should get your valves checked at 6000 miles so keep that in mind.