Power in 5th very jumpy

NDspd · April 11th, 2012, 08:46 PM

Hey guys been feeling something a bit weird with my Ninja. Just outside of my town there is a really big suspension bridge with a good incline. The speed limit is 60mph and sometimes traffic can be a bit heavy. So sometimes I have to go WOT through the gears so I don't get run over.

Anyways, one time I was accelerating hard in 5th gear and when I hit 10-11K rpm, I lost almost all power for a split second. For the whole time in 5th it was losing and gaining power like a kid playing with a light switch. So I came off the throttle and shifted to 6th, problem disappeared for that situation anyways. I think once before I've had the same thing happen in 4th when again accelerating at a good rate.

Any idea what's causing this?...clogged carbs/fuel system? The bike runs perfectly in all other rpms and speeds. It's just when I am accelerating hard through the gears.

Jiggles · April 11th, 2012, 08:52 PM

Too rich in the top end?

gilmorec61 · April 11th, 2012, 08:56 PM

I think it could possibly be your clutch as that has kinda happened to me a few times. If im tryin to accelerate real fast and speed shift, the gears will engage but not quite all the way, and theyll slip a little bit and sometimes go into a fals neutral.

alex.s · April 12th, 2012, 12:57 AM

you failed shifting properly into 5th. it slips out back to 4th, or up to 6th for a second then back to 5th. if you pull the clutch all the way in and give it a rev it should resolve the issue. if it doesn't, changing gears should slam the little bugger in place.

DaBlue1 · April 12th, 2012, 07:32 AM

Does it only happen when going up an incline? I know there are not that many hills down there in the Low Country, so it may just be the bike trying to struggle against gravity while under load at WOT. Being in the right gear and rpm speed is essential when going up inclines. According to you you are at 10-11k in 5th. With stock gears that's approx 74-80 mph. Kicking up to 6th dropped your rpms in a range where the bike is a little richer but still able to maintain speed.

NDspd · April 12th, 2012, 08:37 AM

I've had false neutrals before or gears slipping out plenty of times. It wasn't because of the motor not having enough power to get up the incline. it's like someone is turning the engine on and off randomly, which leads me to believe it's a fuel issue. Maybe the bike needs to get to optimal temps before I accelerate hard...I dunno.

NDspd · April 12th, 2012, 08:37 AM

Quote:

Originally Posted by Jiggles

Too rich in the top end?

How do I tell?

Jiggles · April 12th, 2012, 09:17 AM

Quote:

Originally Posted by NDspd

How do I tell?

Does it do it in every gear? You are unable to pass 11k even in first and second?

NDspd · April 12th, 2012, 01:12 PM

@Jiggles nope, then it's not running rich. It runs perfect in all other rpms and speeds. In fact I really warmed up the bike then went up the bridge...nothing happened, I stayed in 5th from 7k-redline. But later on as I passed a car on a long flat country road in 5th, it did the jumpy thing again at 10k-11k rpm. Once I shifted into 6th at about 70-75 mph, the problem vanished.

Jiggles · April 12th, 2012, 01:18 PM

Well, I have no idea then

KELPHYN · April 12th, 2012, 02:21 PM

You sure your not just hitting the rev limiter?

NDspd · April 13th, 2012, 07:55 AM

Quote:

Originally Posted by KELPHYN

You sure your not just hitting the rev limiter?

Nope, I purposely stayed in 5th going up the bridge yesterday all the way up to 13K rpm. I've hit the rev limiter when at the track, so I have a feeling for it.

I don't think I'm going to worry about this little issue, it's not like I'm at the drag strip or street racing. I just know where the issue lies and I know how to avoid it. If it isn't something that can jeopardize or damage my motor when I'm riding around town or with normal use, then I'm not going to fret about it.

I just look forward to when I can get a bigger bike, which means most of the issues I've had will most likely go away.

April 11th, 2012, 08:46 PM	#1
NDspd 1/4 English, 3/4 Kick Ass Name: Jeremy Location: Dayton, OH Join Date: Sep 2011 Motorcycle(s): 2002 Triumph Speed Triple 955i, '05 Suzuki SV650S(retired), '11 Ninja 250R(sold) Posts: A lot.	Power in 5th very jumpy Hey guys been feeling something a bit weird with my Ninja. Just outside of my town there is a really big suspension bridge with a good incline. The speed limit is 60mph and sometimes traffic can be a bit heavy. So sometimes I have to go WOT through the gears so I don't get run over. Anyways, one time I was accelerating hard in 5th gear and when I hit 10-11K rpm, I lost almost all power for a split second. For the whole time in 5th it was losing and gaining power like a kid playing with a light switch. So I came off the throttle and shifted to 6th, problem disappeared for that situation anyways. I think once before I've had the same thing happen in 4th when again accelerating at a good rate. Any idea what's causing this?...clogged carbs/fuel system? The bike runs perfectly in all other rpms and speeds. It's just when I am accelerating hard through the gears.

April 11th, 2012, 08:52 PM	#2
Jiggles Jigglin' your Jiglets Name: Sean Location: San Jose, Ca Join Date: Jun 2011 Motorcycle(s): 2009 K1300S, 2013 Ninja 300, 2011 Ninja 250R, Faster than Unregistered's ninjette Posts: Too much. Blog Entries: 1 MOTM - Apr '13	Too rich in the top end? __________________________________________________ If the Ninja 250 doesn't have enough power for you, then you don't know how to ride it. AFM #676 Supersports are for n00bs

April 12th, 2012, 12:57 AM	#4
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	you failed shifting properly into 5th. it slips out back to 4th, or up to 6th for a second then back to 5th. if you pull the clutch all the way in and give it a rev it should resolve the issue. if it doesn't, changing gears should slam the little bugger in place. __________________________________________________

April 12th, 2012, 01:18 PM	#10
Jiggles Jigglin' your Jiglets Name: Sean Location: San Jose, Ca Join Date: Jun 2011 Motorcycle(s): 2009 K1300S, 2013 Ninja 300, 2011 Ninja 250R, Faster than Unregistered's ninjette Posts: Too much. Blog Entries: 1 MOTM - Apr '13	Well, I have no idea then __________________________________________________ If the Ninja 250 doesn't have enough power for you, then you don't know how to ride it. AFM #676 Supersports are for n00bs

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April 11th, 2012, 08:56 PM	#3
gilmorec61 ninjette.org guru Name: Chris Location: Newnan, G.A. Join Date: Jan 2012 Motorcycle(s): 2008 Kawasaki Ninja 250R Posts: 347	I think it could possibly be your clutch as that has kinda happened to me a few times. If im tryin to accelerate real fast and speed shift, the gears will engage but not quite all the way, and theyll slip a little bit and sometimes go into a fals neutral.

April 12th, 2012, 07:32 AM	#5
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	Does it only happen when going up an incline? I know there are not that many hills down there in the Low Country, so it may just be the bike trying to struggle against gravity while under load at WOT. Being in the right gear and rpm speed is essential when going up inclines. According to you you are at 10-11k in 5th. With stock gears that's approx 74-80 mph. Kicking up to 6th dropped your rpms in a range where the bike is a little richer but still able to maintain speed.

April 12th, 2012, 08:37 AM	#6
NDspd 1/4 English, 3/4 Kick Ass Name: Jeremy Location: Dayton, OH Join Date: Sep 2011 Motorcycle(s): 2002 Triumph Speed Triple 955i, '05 Suzuki SV650S(retired), '11 Ninja 250R(sold) Posts: A lot.	I've had false neutrals before or gears slipping out plenty of times. It wasn't because of the motor not having enough power to get up the incline. it's like someone is turning the engine on and off randomly, which leads me to believe it's a fuel issue. Maybe the bike needs to get to optimal temps before I accelerate hard...I dunno.

April 12th, 2012, 01:12 PM	#9
NDspd 1/4 English, 3/4 Kick Ass Name: Jeremy Location: Dayton, OH Join Date: Sep 2011 Motorcycle(s): 2002 Triumph Speed Triple 955i, '05 Suzuki SV650S(retired), '11 Ninja 250R(sold) Posts: A lot.	@Jiggles nope, then it's not running rich. It runs perfect in all other rpms and speeds. In fact I really warmed up the bike then went up the bridge...nothing happened, I stayed in 5th from 7k-redline. But later on as I passed a car on a long flat country road in 5th, it did the jumpy thing again at 10k-11k rpm. Once I shifted into 6th at about 70-75 mph, the problem vanished.

April 12th, 2012, 02:21 PM	#11
KELPHYN ninjette.org guru Name: Calvin Location: Quesnel, B.C Join Date: Aug 2009 Motorcycle(s): '08 250R (sold), 2013 300SE Posts: 276	You sure your not just hitting the rev limiter?