Is this a misfire?

aharnak · June 4th, 2013, 10:09 AM

Hey all,

So just a quick preface, my bike runs relatively well. I don't feel any major issues when riding. However, I was working on my bike with my dad (who has worked with cars for decades and is an engine expert), and he pointed out that at sustained medium-higher RPM's, it sounds like there's a misfire. After he pointed it out, I noticed it - it's like a quiet irregular gurgle or series of pops, hiding behind the normal sound of the engine. While I've only owned this particular bike for a few months, I've ridden it for years, and as far as I know, it's sounded like this for as long as I can remember. But hey, if it's something I can straighten out to make the bike perform better, why not? So my question is this - does this sound like a characteristic of the Ninja engine?

csmith12 · June 4th, 2013, 10:16 AM

You have a full aftermarket exhaust installed?

aharnak · June 4th, 2013, 10:21 AM

Quote:

Originally Posted by csmith12

You have a full aftermarket exhaust installed?

Nope, the whole bike is stock.

csmith12 · June 4th, 2013, 10:27 AM

well hmmm then

aharnak · June 4th, 2013, 10:30 AM

Hmm indeed, haha

csmith12 · June 4th, 2013, 10:32 AM

Check your klean air hoses or just plug it with a block off plate.

lol @ my spelling

lgk · June 4th, 2013, 12:57 PM

check the airbox for debris

subxero · June 4th, 2013, 01:04 PM

Sounds like it could be a few things. If it is a misfire i would think you should be able to feel it when riding the bike. You say medium-high sustained rpms, do you notice it at all throttle positions? example. You only notice it at WOT, or you only notice it at 1/2 throttle ect...

When i was jetting my new gen after i removed airbox and installed full exhaust my main jet was running very rich. so at Mid-high rpm at WOT i had a miss fire type feel. When i leaned out the main jet it all went away and all is well.

aharnak · June 4th, 2013, 01:27 PM

Quote:

Originally Posted by subxero

Sounds like it could be a few things. If it is a misfire i would think you should be able to feel it when riding the bike. You say medium-high sustained rpms, do you notice it at all throttle positions? example. You only notice it at WOT, or you only notice it at 1/2 throttle ect...

When i was jetting my new gen after i removed airbox and installed full exhaust my main jet was running very rich. so at Mid-high rpm at WOT i had a miss fire type feel. When i leaned out the main jet it all went away and all is well.

I only ever actually notice it when it's not in gear, usually on the center stand, I don't notice it at all when I'm riding. Above the normal idle speed, starting at maybe 3500, it pretty much occurs at any RPM.

June 4th, 2013, 10:09 AM	#1
aharnak ninjette.org member Name: A.J. Location: Conshohocken, PA Join Date: Apr 2013 Motorcycle(s): 2007 Kawasaki Ninja EX250 Posts: 29	Is this a misfire? Hey all, So just a quick preface, my bike runs relatively well. I don't feel any major issues when riding. However, I was working on my bike with my dad (who has worked with cars for decades and is an engine expert), and he pointed out that at sustained medium-higher RPM's, it sounds like there's a misfire. After he pointed it out, I noticed it - it's like a quiet irregular gurgle or series of pops, hiding behind the normal sound of the engine. While I've only owned this particular bike for a few months, I've ridden it for years, and as far as I know, it's sounded like this for as long as I can remember. But hey, if it's something I can straighten out to make the bike perform better, why not? So my question is this - does this sound like a characteristic of the Ninja engine?

June 4th, 2013, 10:16 AM	#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	You have a full aftermarket exhaust installed? __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

June 4th, 2013, 10:27 AM	#4
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 hmmm then __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

June 4th, 2013, 10:32 AM	#6
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	Check your klean air hoses or just plug it with a block off plate. lol @ my spelling __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

June 4th, 2013, 12:57 PM	#7
lgk ninjette.org certified postwhore Name: Jason Location: Norfolk, VA Join Date: Dec 2011 Motorcycle(s): 2012 EX250, 2014 EX300 Posts: A lot.	check the airbox for debris __________________________________________________ Ethioknight Memorial Fund- Sticker sale http://www.ninjette.org/forums/showthread.php?t=111700

June 4th, 2013, 10:30 AM	#5
aharnak ninjette.org member Name: A.J. Location: Conshohocken, PA Join Date: Apr 2013 Motorcycle(s): 2007 Kawasaki Ninja EX250 Posts: 29	Hmm indeed, haha

June 4th, 2013, 01:04 PM	#8
subxero dirty boy Name: Joe Location: Johnstown, PA Join Date: Sep 2012 Motorcycle(s): I don't even know anymore?? Posts: A lot. MOTM - Apr '14	Sounds like it could be a few things. If it is a misfire i would think you should be able to feel it when riding the bike. You say medium-high sustained rpms, do you notice it at all throttle positions? example. You only notice it at WOT, or you only notice it at 1/2 throttle ect... When i was jetting my new gen after i removed airbox and installed full exhaust my main jet was running very rich. so at Mid-high rpm at WOT i had a miss fire type feel. When i leaned out the main jet it all went away and all is well.
	1 out of 1 members found this post helpful.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Random misfire or backfires on one cylinder.	setasai	General Motorcycling Discussion	2	May 6th, 2012 05:12 PM
[topix.net] - "Mythbusters" cannonball misfire tears through home	Ninjette Newsbot	Motorcycling News	0	December 8th, 2011 11:50 AM