high rpm issue

rider_tim · September 17th, 2014, 02:44 PM

New rider here!

So i have a 2012 ninja 250 stock everything and I'm having the issue with high rpm, 70mph @11krpm and 12krpm on hot days. I've been reading through the forums that it could be a faulty tach or the cdi. Although I read those have been correlated with the 08-10 ninja's.

Has anyone been successful in fixing this issue?

I'm going to clean the carbs this weekend, but I'm not sure if that causes high rpms.

csmith12 · September 17th, 2014, 02:49 PM

Welcome Tim!

What is the issue? Bogging, stuttering, tach reading wrong, something else?

rider_tim · September 17th, 2014, 02:53 PM

Hey Chris,

6 gear 70 mph @ 11k rpm and 12k rpm on hot days.

The bike runs fine, but it concerns me that the rpm is just too high compared to what I've been reading (6 gear 70mph @ 8-9k rpm).

I'm really trying to get to 80mph comfortably on the freeway, but I can't do that when I'm so close to redlining the bike. And I don't think I'm bogging or stuttering.

Any advice? Is my tach bad?

dcj13 · September 17th, 2014, 02:59 PM

Welcome aboarde, Tim!

What gearing (# of teeth on front and rear sprocket) are you running?

You might compare the speedo reading with GPS speed using your smartphone.

csmith12 · September 17th, 2014, 02:59 PM

The next obvious question is; What is your gearing? Stock is 14/45 fyi.

rider_tim · September 17th, 2014, 03:03 PM

So I actually counted last night and i got 14 front and 44 back. I will count the back again tonight to make sure (might have miscounted).

rider_tim · September 17th, 2014, 03:04 PM

I will also try the gps speed reading as I'm going home from work tonight also to make sure

dcj13 · September 17th, 2014, 03:08 PM

You could cover the tach with electrical tape.

alex.s · September 17th, 2014, 03:10 PM

does it sound any different when its hot and reading wrong compared to cold and reading correctly? if it sounds the same i would go with the black-tape-over-the-gauge method

rider_tim · September 17th, 2014, 08:12 PM

so yeah the sprockets are stock 14/45. The speedometer is working correctly or very close to it. Any advice on what I should do?

csmith12 · September 18th, 2014, 09:01 AM

Well, you might have one of those cdi's that read rpms higher when hot. If so, there really isn't a fix for it aside of replacement. The only other thing that I can think of off the top of my head is the choke, make sure the switch actually turns it on and off.

rider_tim · September 18th, 2014, 10:10 AM

I just noticed while i was riding today that the tach would be a little sporadic, (moving back and forth in 8k to 9k rpm). It's not a smooth movement and I'm accelerating so there should be no reason it goes back down to 8k from 9. Is this a faulty tach?

Oh and about the choke, I'm going to adjust the thing this weekend, but I do know that on my bike the choke won't work until it's 3/4 - full pulled. Maybe this is the issue?

csmith12 · September 18th, 2014, 10:14 AM

Hmmm... a sporadic tach is normally a sign of a battery problem. Could be as simple as one of the connections are loose or dirty. Have a peek there first, then test the battery itself.

rider_tim · September 18th, 2014, 10:53 AM

Alright I'll take a look at it this weekend, and I'll return with my findings. Thanks chris!

Alex · September 20th, 2014, 11:38 AM

Quote:

Originally Posted by rider_tim

I'm really trying to get to 80mph comfortably on the freeway, but I can't do that when I'm so close to redlining the bike. And I don't think I'm bogging or stuttering.

Keep in mind that you're not redlining the bike. The engine is still turning the same speed it needs to for whatever speed your are traveling. Remember, there is a mechanical link from the rear wheel right through the chain to the transmission, the clutch, and then engine. All you're seeing on your gauges is measurement error if the numbers are off.

Asspire · September 20th, 2014, 05:49 PM

I have the same problem with mine, changing the cdi didn't help either, so i just ride by ear now and ignore the tach. get used to the sound of the engine, the gauge will vary with temp, but the engine is still working the same since nothing changed mechanically. Just go by ear, then ignore the tach all together. problem solved.

also, buying an R6 will cure the tach problem......

rider_tim · September 23rd, 2014, 02:27 PM

So I worked on the bike last weekend and found that nothing really helps. I could replace the tach, but I really don't want to do it lol.

At this point, I'm just going to ride. The tach must be faulty and I'm just gonna ignore it. It was a pain in the ass taking the bike apart and I wasted too much riding time!

snot · September 23rd, 2014, 04:30 PM

Welcome, smaller rear sprocket might help too. I went to a 43 on the rear on my 09 and it did help.

September 17th, 2014, 02:44 PM	#1
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	high rpm issue New rider here! So i have a 2012 ninja 250 stock everything and I'm having the issue with high rpm, 70mph @11krpm and 12krpm on hot days. I've been reading through the forums that it could be a faulty tach or the cdi. Although I read those have been correlated with the 08-10 ninja's. Has anyone been successful in fixing this issue? I'm going to clean the carbs this weekend, but I'm not sure if that causes high rpms.

September 17th, 2014, 02:49 PM	#2
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 Tim! What is the issue? Bogging, stuttering, tach reading wrong, something else? __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

September 17th, 2014, 02:59 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	The next obvious question is; What is your gearing? Stock is 14/45 fyi. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

September 17th, 2014, 03:08 PM	#8
dcj13 Participant Name: Dave Location: South of Seattle Join Date: Oct 2012 Motorcycle(s): '94 K75 std Posts: Too much. MOTM - Aug '15	You could cover the tach with electrical tape.
	2 out of 2 members found this post helpful.

September 17th, 2014, 03:10 PM	#9
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	does it sound any different when its hot and reading wrong compared to cold and reading correctly? if it sounds the same i would go with the black-tape-over-the-gauge method __________________________________________________

September 17th, 2014, 02:53 PM	#3
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	Hey Chris, 6 gear 70 mph @ 11k rpm and 12k rpm on hot days. The bike runs fine, but it concerns me that the rpm is just too high compared to what I've been reading (6 gear 70mph @ 8-9k rpm). I'm really trying to get to 80mph comfortably on the freeway, but I can't do that when I'm so close to redlining the bike. And I don't think I'm bogging or stuttering. Any advice? Is my tach bad?

September 17th, 2014, 03:03 PM	#6
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	So I actually counted last night and i got 14 front and 44 back. I will count the back again tonight to make sure (might have miscounted).

September 17th, 2014, 03:04 PM	#7
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	I will also try the gps speed reading as I'm going home from work tonight also to make sure

September 17th, 2014, 08:12 PM	#10
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	so yeah the sprockets are stock 14/45. The speedometer is working correctly or very close to it. Any advice on what I should do?

September 18th, 2014, 09:01 AM	#11
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	Well, you might have one of those cdi's that read rpms higher when hot. If so, there really isn't a fix for it aside of replacement. The only other thing that I can think of off the top of my head is the choke, make sure the switch actually turns it on and off. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

September 18th, 2014, 10:10 AM	#12
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	I just noticed while i was riding today that the tach would be a little sporadic, (moving back and forth in 8k to 9k rpm). It's not a smooth movement and I'm accelerating so there should be no reason it goes back down to 8k from 9. Is this a faulty tach? Oh and about the choke, I'm going to adjust the thing this weekend, but I do know that on my bike the choke won't work until it's 3/4 - full pulled. Maybe this is the issue?

September 18th, 2014, 10:14 AM	#13
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	Hmmm... a sporadic tach is normally a sign of a battery problem. Could be as simple as one of the connections are loose or dirty. Have a peek there first, then test the battery itself. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

September 18th, 2014, 10:53 AM	#14
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	Alright I'll take a look at it this weekend, and I'll return with my findings. Thanks chris!

September 20th, 2014, 05:49 PM	#16
Asspire Fix It Till Ya Break It Name: Asspyre Location: T.Dot Join Date: Oct 2011 Motorcycle(s): 08 250RRrrrr Posts: 623	I have the same problem with mine, changing the cdi didn't help either, so i just ride by ear now and ignore the tach. get used to the sound of the engine, the gauge will vary with temp, but the engine is still working the same since nothing changed mechanically. Just go by ear, then ignore the tach all together. problem solved. also, buying an R6 will cure the tach problem......

September 23rd, 2014, 02:27 PM	#17
rider_tim ninjette.org newbie Name: Tim Location: sf Join Date: Sep 2014 Motorcycle(s): 250 Posts: 8	So I worked on the bike last weekend and found that nothing really helps. I could replace the tach, but I really don't want to do it lol. At this point, I'm just going to ride. The tach must be faulty and I'm just gonna ignore it. It was a pain in the ass taking the bike apart and I wasted too much riding time!

September 23rd, 2014, 04:30 PM	#18
snot sammich maker Name: snot Location: West Ohio - in the kitchen Join Date: Feb 2012 Motorcycle(s): 2013 white 300, 09 KLX 250 SF, 09 thunder blue 250(traded) Posts: A lot. MOTM - Apr '15	Welcome, smaller rear sprocket might help too. I went to a 43 on the rear on my 09 and it did help.

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