Please Help - Bike not running well

CampinCracker · November 9th, 2011, 04:05 PM

I have an 06 ninja 250 I was riding down the road about 50mph and the bike started running really bad, I have cleaned the carbs the gas is good and I think it is getting plenty of fuel. It is getting air. I think the problem may be in the spark but I don't know what to do now. I put new plugs in it. It's almost like the rpms are going up really slow and it is missing and backfiring. Like it is getting random spark could this be an ic igniter problem I just don't know what I should start trying to fix. The wires on the coils are still connected very good.
Thanks for the help.

"A" · November 9th, 2011, 05:04 PM

Are the carbs synchronized?

CampinCracker · November 9th, 2011, 05:12 PM

Quote:

Originally Posted by "A"

Are the carbs synchronized?

Yes they are sync'd and it just did it driving down the road like something just went bad and I don't know what it is.

choneofakind · November 9th, 2011, 11:19 PM

Check the easy things first.

After you sync'd the carbs, did you connect the vacuum hoses correctly?

Have you checked that the petcock works properly?

CampinCracker · November 10th, 2011, 01:18 AM

Quote:

Originally Posted by choneofakind

Check the easy things first.

After you sync'd the carbs, did you connect the vacuum hoses correctly?

Have you checked that the petcock works properly?

I cleaned the carbs after it did this I didn't think it was a carb problem but I cleaned them anyway. I have taken them apart many times they are put back together correctly. It is running just like it did before I cleaned the carbs. The petcock is working correctly. I was just driving about 50 but I was hard on the throttle and then it just acted like it shut down and then it started missing and sputtering really bad all of a sudden which makes me think it is electrical or the motor lost compression. I don't really know where to go from here. Thanks for the replies.

"A" · November 10th, 2011, 06:20 AM

How does it start up?

Does it idle at all?

Does it idle without choke when it's cold?

Is idle smooth once warmed up?

FrugalNinja250 · November 10th, 2011, 06:59 AM

With it running, wiggle the connectors where the two wires connect to each coil. If the bike changes the way it runs, then you have a broken wire inside the rubber connector shield. BTDT. I'd be riding along, suddenly it would take full throttle to maintain 55mph, then after a while it'd take off like a rocket. Very intermittent, very unpredictable. Took forever to track that problem down.

CampinCracker · November 10th, 2011, 10:21 AM

I will try that thanks. It idles without my help when it's warmed up but I don't know if I would say smoothly

choneofakind · November 10th, 2011, 10:04 PM

When you cleaned the carbs, did you get a chance to look at the diaphragms?

CampinCracker · November 10th, 2011, 10:50 PM

Quote:

Originally Posted by choneofakind

When you cleaned the carbs, did you get a chance to look at the diaphragms?

The diaphragms were good and still makes the sucking noise when you push it up and let it down.

n4mwd · November 15th, 2011, 05:38 AM

I have heard of people saying that alcohol in the gas can cause lacquer in the bowls to dislodge and clog the carbs in motion. When you cleaned them, are you certain you got ALL of the little passageways clear? There are several of them in each carb.

When you are idling, the fuel takes a different route through the carbs so its possible to have it idle fine and run awful or run fine and idle awful.

CampinCracker · November 15th, 2011, 08:19 AM

Yes I am sure about the carbs I cleaned it good all the jets are super clean and then I seperated the carbs and pulled everything out of them and soaked them in berryman's b12 overnight

Jinx250 · November 15th, 2011, 09:00 AM

All things being equal, and assuming the carbs are truly clean, when you get an "all of a sudden" issue, most of the time it's the gas. Most likely that you got some fuel with water in it. Water doesn't burn like gas (obviously) and will make the bike act exactly as you described. Of course, it could be any number of other things too, but start by drianing the float bowls and checking the gas that comes out for water / contamination. You could also let the bike sit for a while and then draw off a bunch of gas fron the tank via the petcock (set to reserve) and check that as well. Any water or other contamination should be readily visible after letting the siphoned off gas settle for a minute or two.

n4mwd · November 15th, 2011, 12:45 PM

Quote:

Originally Posted by CampinCracker

Yes I am sure about the carbs I cleaned it good all the jets are super clean and then I seperated the carbs and pulled everything out of them and soaked them in berryman's b12 overnight

The reason I ask is because there are about three(?) micropassageways in each carb and it only takes one blockage to ruin your day. Soaking wont clean anything except cosmetic stuff. I hope you pulled the diaphragms out before soaking because they could get damaged. If they do, you've ruined the carbs.

I don't think its a wiring problem or bad gas or else it would act up when idling. Sometimes plugs can work fine at low speed, but act up at high speed or when hot. You can watch your tach and see if its vibrating when its acting up. That could indicate an ECU or ECU sensor issue. But I've never actually heard of anyone having a bad ECU. The ECU generates the pulses for the coils to make the spark.

Let us know what you find.

CampinCracker · November 15th, 2011, 12:51 PM

Quote:

Originally Posted by n4mwd

The reason I ask is because there are about three(?) micropassageways in each carb and it only takes one blockage to ruin your day. Soaking wont clean anything except cosmetic stuff. I hope you pulled the diaphragms out before soaking because they could get damaged. If they do, you've ruined the carbs.

I don't think its a wiring problem or bad gas or else it would act up when idling. Sometimes plugs can work fine at low speed, but act up at high speed or when hot. You can watch your tach and see if its vibrating when its acting up. That could indicate an ECU or ECU sensor issue. But I've never actually heard of anyone having a bad ECU. The ECU generates the pulses for the coils to make the spark.

Let us know what you find.

Yeah I pulled the diaphragms out I have done carbs many times and I also blew out all of the passages with carb cleaner and also air as well, I'm going to try some new gas and see what it does I do have new plugs in the bike and it tuns on the same on all of the plugs. Thanks for the replies.

November 9th, 2011, 04:05 PM	#1
CampinCracker ninjette.org member Name: Jason Location: Texas Join Date: Mar 2011 Motorcycle(s): None yet Posts: 14	Please Help - Bike not running well I have an 06 ninja 250 I was riding down the road about 50mph and the bike started running really bad, I have cleaned the carbs the gas is good and I think it is getting plenty of fuel. It is getting air. I think the problem may be in the spark but I don't know what to do now. I put new plugs in it. It's almost like the rpms are going up really slow and it is missing and backfiring. Like it is getting random spark could this be an ic igniter problem I just don't know what I should start trying to fix. The wires on the coils are still connected very good. Thanks for the help.

November 15th, 2011, 05:38 AM	#11
n4mwd ninjette.org certified postwhore Name: D Location: Palm Beach, FL Join Date: Oct 2010 Motorcycle(s): 2006 Ninja 250R, 2007 EFI Ninja 250R Posts: A lot. Blog Entries: 1	I have heard of people saying that alcohol in the gas can cause lacquer in the bowls to dislodge and clog the carbs in motion. When you cleaned them, are you certain you got ALL of the little passageways clear? There are several of them in each carb. When you are idling, the fuel takes a different route through the carbs so its possible to have it idle fine and run awful or run fine and idle awful. __________________________________________________ My Ninja Blog Proud member of ABATE.My NYC Road Rage documentary - CENSORED!

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November 9th, 2011, 05:04 PM	#2
"A" vampire Name: A Location: IT Join Date: Feb 2011 Motorcycle(s): 2 many 2 list Posts: A lot.	Are the carbs synchronized?

November 9th, 2011, 11:19 PM	#4
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	Check the easy things first. After you sync'd the carbs, did you connect the vacuum hoses correctly? Have you checked that the petcock works properly?

November 10th, 2011, 06:20 AM	#6
"A" vampire Name: A Location: IT Join Date: Feb 2011 Motorcycle(s): 2 many 2 list Posts: A lot.	How does it start up? Does it idle at all? Does it idle without choke when it's cold? Is idle smooth once warmed up?

November 10th, 2011, 06:59 AM	#7
FrugalNinja250 ninjette.org certified postwhore Name: Frugal Location: Dallas/Fort Worth (DFW) Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.	With it running, wiggle the connectors where the two wires connect to each coil. If the bike changes the way it runs, then you have a broken wire inside the rubber connector shield. BTDT. I'd be riding along, suddenly it would take full throttle to maintain 55mph, then after a while it'd take off like a rocket. Very intermittent, very unpredictable. Took forever to track that problem down.

November 10th, 2011, 10:21 AM	#8
CampinCracker ninjette.org member Name: Jason Location: Texas Join Date: Mar 2011 Motorcycle(s): None yet Posts: 14	I will try that thanks. It idles without my help when it's warmed up but I don't know if I would say smoothly

November 10th, 2011, 10:04 PM	#9
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	When you cleaned the carbs, did you get a chance to look at the diaphragms?

November 15th, 2011, 08:19 AM	#12
CampinCracker ninjette.org member Name: Jason Location: Texas Join Date: Mar 2011 Motorcycle(s): None yet Posts: 14	Yes I am sure about the carbs I cleaned it good all the jets are super clean and then I seperated the carbs and pulled everything out of them and soaked them in berryman's b12 overnight

November 15th, 2011, 09:00 AM	#13
Jinx250 Smoker Name: Bob Location: SoCal Join Date: Dec 2010 Motorcycle(s): Guess.... Posts: 556	All things being equal, and assuming the carbs are truly clean, when you get an "all of a sudden" issue, most of the time it's the gas. Most likely that you got some fuel with water in it. Water doesn't burn like gas (obviously) and will make the bike act exactly as you described. Of course, it could be any number of other things too, but start by drianing the float bowls and checking the gas that comes out for water / contamination. You could also let the bike sit for a while and then draw off a bunch of gas fron the tank via the petcock (set to reserve) and check that as well. Any water or other contamination should be readily visible after letting the siphoned off gas settle for a minute or two.