March 11th, 2009, 04:33 PM | #1 |
ninjette.org certified postwhore
Name: Sam
Location: Northern Virginia
Join Date: Nov 2008 Motorcycle(s): Ninja 250R 2009 and ZX-12R 2000 Posts: A lot.
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Backfire at Startup!!!!!!
I haven't been able to ride since Sunday, so I finally hurried out just before sundown tonight. It was 64 degrees F. Turn the ignition on and barely moved the choke. Hit the start button and BANG! Almost jumped off the bike. Let me tell you, normally nothing makes me jump, but my "virtual" behind was already sitting on top of my wife's Jeep Wrangler (parked in front of me).
Yes, my friend, I read everyone of the threads at the kawi forum about this. Just wanted to share my experience with everyone. Almost 700 miles on the bike and made it thru the winter without this occuring. I will be expecting it next time. |
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March 11th, 2009, 04:34 PM | #2 |
Join Date: Nov 2008 Posts: Too much.
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March 11th, 2009, 04:40 PM | #3 |
ninjette.org member
Name: Adam
Location: Sacramento area
Join Date: Feb 2009 Motorcycle(s): 2009 Ninja 250 - blue Posts: 177
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Tell you one thing...if it happens at 7 am, it will wake you up.
It will wake you, your wife, your neighbors, people in China... |
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March 11th, 2009, 04:50 PM | #4 |
ninjette.org certified postwhore
Name: Alex
Location: Belfast, ME
Join Date: Jul 2008 Motorcycle(s): 2010 Honda NT-700-V, formerly, Green 2008 Ninja 250R Posts: A lot.
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They seem to do that on ocassion--really don`t know why--but they do. I sort of like to think that Kermit is clearing his throat.
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March 11th, 2009, 04:52 PM | #5 |
ninjette.org sage
Name: David
Location: Wellington, New Zealand
Join Date: Dec 2008 Motorcycle(s): 08 Ninja 250R in Green! (Sold) Now 2011 Triumph Daytona 675 SE Posts: 564
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Mine will occasionally backfire at startup. I am actually trying to replicate it so I can find the cause.
I played with the throttle when it was off lastnight and this morning before starting and no backfire...
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2008 GREEN Kawasaki Ninja 250R. AreaP Quiet Core Carbon Fibre : 8000k HIDs : Dynojet Jet kit : Double Bubble Windscreen |
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March 12th, 2009, 08:32 AM | #6 |
ninjette.org guru
Name: Ryne
Location: West Laf, IN
Join Date: Feb 2009 Motorcycle(s): 2008 Ninja 250R Posts: 290
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First time I heard it, my bike was backed up to my house, so the pipe was opening about 3ft from a wall.
...had to change my pants after that one.
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http://www.southparkstudios.com/clips/224099 |
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March 12th, 2009, 06:07 PM | #7 |
lolwut
Name: Alex
Location: socal
Join Date: Dec 2008 Motorcycle(s): 2008 Kawasaki Ninja 250R Posts: 196
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it happened to me again today for the first time in months. It gave me a bit of a scare when i started it up in the garage to roll out...
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08 Blue Ninja 250R |
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March 12th, 2009, 09:09 PM | #8 |
Da Duckman
Name: Duckman
Location: Pensacola, FL
Join Date: Nov 2008 Motorcycle(s): '08 250R, '06 Chopper, '80 Puch Magnum II, '01 SV650, '99 CR250/CR500AF Sportbike. '02 CRF450/CR500AF Dirt Posts: 480
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I get a nasty afterfire out the exhaust with a nice burst of flames! Its LOUD! It happens at least once a week when starting it from cold first thing in the morning. It scared the crap out of me the first time. Choke or not, there is no consistency to it.
One morning a bunch of gangbangers were across the street hanging out with one of the teenage boys over there when it FIRED! They all ran for cover, you'd of thought that there was a driveby going on, haha. Just glad I didn't get shot! |
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March 12th, 2009, 10:15 PM | #9 |
ninjette.org sage
Name: patricK
Location: San Jose, CA--BAY AREA!
Join Date: Mar 2009 Motorcycle(s): '08 blue 250R [sold]. '09 lime ZX-6R [stolen :( ]. '06 blue 636. Posts: 918
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Hey! This happened to me too! Gave me a fright at first. I just assumed it was because of my aftermarket slip on not installed properly since it was a DIY for me.
I always cover my hear when I start it up now but it hasn't happened for a while. When it was happening my pipe was about 3ft or less from the wall too, kept in an underground garage at my condo. So idk.. was it the cold in that big garage, the distance from the wall, my slip on, of all of the above? All I know is that it stopped doing it. Last futzed with by paterick4o8; March 15th, 2009 at 06:43 PM. |
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March 15th, 2009, 06:31 PM | #10 |
ninjette.org guru
Name: Bill
Location: Orlando
Join Date: Dec 2008 Motorcycle(s): 2008 Ninja 250r - Traded for 2009 ER-6N Posts: 424
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If mine sits for more than 2 days, I kind of expect it at this point. I only get it maybe 1 time out of 5, but it's pretty damn loud... I've learned to cover one ear (the one closest to the exhaust,) especially on cooler (<70*) days.
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March 15th, 2009, 07:28 PM | #11 |
ninjette.org member
Name: Simon
Location: Linden, NC
Join Date: Feb 2009 Motorcycle(s): 2009 Ninja 250R Posts: 81
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mine did it once, before i wrecked it
but yea i didnt even notice it till my mom was like, wtf was that lol it was pretty loud though, but i have a full face so i guess that deadens the sound |
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March 17th, 2009, 09:00 PM | #12 |
ninjette.org sage
Name: patricK
Location: San Jose, CA--BAY AREA!
Join Date: Mar 2009 Motorcycle(s): '08 blue 250R [sold]. '09 lime ZX-6R [stolen :( ]. '06 blue 636. Posts: 918
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whaa wth?? it did it today again for me.. but it was sunny and temperature in the mid 60s outside.
last time this happened was almost 2 months ago. I don't get it |
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March 17th, 2009, 09:10 PM | #13 |
Join Date: Nov 2008 Posts: Too much.
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that's the point... nobody gets it.
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March 18th, 2009, 12:32 AM | #14 |
ninjette.org member
Name: Cheng
Location: Malaysia KL
Join Date: Feb 2009 Motorcycle(s): Kawasaki ninja250r Posts: 70
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It happen to me yesterday when i try to start my bike, suddenly a cannon firing sound came out from my pipe after almost a week i didnt use my bike even malaysia weather is hot all day long.
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March 22nd, 2009, 09:26 AM | #15 |
ninjette.org certified postwhore
Name: Steve
Location: Kekaha, Kauai HI
Join Date: Jan 2009 Motorcycle(s): 05 GSX-R 600 2003 EX250: Woodcraft Bars, Levers, Mirrors, Shim'd Mixture, Synthetic, '08 Rear Shock Posts: A lot.
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just curious and maybe i missed the answer to this...is it happening only during start-up?
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Remember when sex was safe and motorcycles were dangerous? |
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March 22nd, 2009, 09:27 AM | #16 |
Join Date: Nov 2008 Posts: Too much.
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yes
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March 22nd, 2009, 12:49 PM | #17 |
ninjetter
Name: Craig
Location: Los Angeles
Join Date: Mar 2009 Motorcycle(s): 2009 Ninja 250r Posts: 27
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I have around 1200 miles on my 09 and it's happened to me twice.
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March 22nd, 2009, 03:52 PM | #18 | |
ninjette.org certified postwhore
Name: Steve
Location: Kekaha, Kauai HI
Join Date: Jan 2009 Motorcycle(s): 05 GSX-R 600 2003 EX250: Woodcraft Bars, Levers, Mirrors, Shim'd Mixture, Synthetic, '08 Rear Shock Posts: A lot.
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Quote:
so...yer bike...got hot farts is all
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Remember when sex was safe and motorcycles were dangerous? |
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March 23rd, 2009, 06:52 AM | #19 |
ninjette.org member
Name: Cheng
Location: Malaysia KL
Join Date: Feb 2009 Motorcycle(s): Kawasaki ninja250r Posts: 70
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Regrading with the backfire at startup, i ask few of my friends, they said maybe there some fuel still trap inside the carb. They advise is not to itchy hand try open the throttle when you want to stop the engine.
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March 29th, 2009, 09:19 AM | #20 |
ninjette.org certified postwhore
Name: Kim
Location: mundo de ensueño
Join Date: Nov 2008 Motorcycle(s): '08 250 Posts: A lot.
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girls don't fart, remember?
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March 29th, 2009, 01:34 PM | #21 |
one disaster at a time
Name: Jody
Location: West Georgia
Join Date: Aug 2008 Motorcycle(s): EX250J9 Posts: 411
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Has my first backfire today. 646 miles on the bike, temperature in the mid 40s... first crank of the day and it went Bang! It wasn't like a gun. More like a small firecracker.
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March 29th, 2009, 04:30 PM | #22 |
ninjette.org sage
Name: Tim
Location: Portland, OR
Join Date: Dec 2008 Motorcycle(s): 2009 SE Ninja 250R Posts: 796
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ooo my backfire devirgining was like a gun. Happened last week (500+kms). Thankfully I didn't freak out cause I remembered this thread
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March 29th, 2009, 05:19 PM | #23 |
one disaster at a time
Name: Jody
Location: West Georgia
Join Date: Aug 2008 Motorcycle(s): EX250J9 Posts: 411
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I read that thread. My personal observations:
I don't play with the throttle when it isn't running. I crank it without the choke. It backfired anyway. I prefer the whistling gas tank anomaly to the exploding engine conundrum That's all for now |
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April 3rd, 2009, 10:29 AM | #24 |
250Arrrgh!
Name: Andrew
Location: San Francisco
Join Date: Jan 2009 Motorcycle(s): 2009 250R, 2001 996 Posts: 143
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10k miles and not a single backfire. Sometimes I wish it would happen just once so I know what everyone is talking about when they say it's "loud."
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April 3rd, 2009, 10:40 AM | #25 |
Da Duckman
Name: Duckman
Location: Pensacola, FL
Join Date: Nov 2008 Motorcycle(s): '08 250R, '06 Chopper, '80 Puch Magnum II, '01 SV650, '99 CR250/CR500AF Sportbike. '02 CRF450/CR500AF Dirt Posts: 480
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April 3rd, 2009, 11:57 AM | #26 | |
ninjette.org sage
Name: Tim
Location: Portland, OR
Join Date: Dec 2008 Motorcycle(s): 2009 SE Ninja 250R Posts: 796
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Quote:
But if you've owned a pre-gen, it didn't seem to backfire on those - or atleast it never happened to me. After 500kms on the new-gen, though, I thought I got shot... |
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April 3rd, 2009, 12:59 PM | #27 | |
Da Duckman
Name: Duckman
Location: Pensacola, FL
Join Date: Nov 2008 Motorcycle(s): '08 250R, '06 Chopper, '80 Puch Magnum II, '01 SV650, '99 CR250/CR500AF Sportbike. '02 CRF450/CR500AF Dirt Posts: 480
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Quote:
Of course this was more obvious when I upgraded to the AreaP exhaust. No baffles or flip-flopping chambers in there to contain it. If I give it a little rev to 5k let it wind down a bit and fiddle with my run switch at a red light I can make it POP really loud scaring the other drivers around me. At night I even get a nice 24" blue flame. If I had a catalytic it would probably be harmful, otherwise it sure is fun! |
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April 3rd, 2009, 05:06 PM | #28 |
Frak It
Name: Sean
Location: SWFL
Join Date: Dec 2008 Motorcycle(s): 2008 Ninja 250R Posts: 199
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The motorcycle is irrevocably damaged. Please send it to me for proper disposal.
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April 3rd, 2009, 05:23 PM | #29 |
Join Date: Nov 2008 Posts: Too much.
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http://www.2carpros.com/how_does_it_work/backfire.htm
What is a Backfire? There are typically two kinds of engine backfires, one is generated from the intake manifold of the engine, and the second is expelled from the exhaust pipe at the rear of the car. A backfire is an explosion of sorts in the intake manifold or the exhaust system. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake, or too rich (too much fuel) you may get a backfire out of the exhaust system. Most backfires are easily repaired by correcting the imbalance and providing a greater or lesser percentage of fuel to the mixture. |
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April 16th, 2009, 04:07 AM | #30 | |
ninjette.org member
Name: snow
Location: Australia
Join Date: Apr 2009 Motorcycle(s): BMW f800gs Posts: 31
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Quote:
My bike, (bmw f800gs) backfires in a minimal way only, but only while riding This occurs due to a slip on exhaust that has a bad seal, then you role off the throttle thus extra air gets in exhaust and you get a nice little pop pop pop. No probs, quite nice actually (this is common on this model and very much liked by many owners). One possible cause with the 250r, but very unlikely due to your exhaust construction and no movement at the time to loosen seal. It sounds like your bikes are getting a huge bang. This is not good for the exhaust, even worse if it is in the intake. A big bang in the exhaust can destroy cats and internal parts. To diagnose i would be looking at 1. how you turn off your bike, maybe in a way that leave excess fuel in the cylinder/carbie. 2. turning off you fuel tap so that no fuel can leak into the carbie/cylinder (assuming there is a tap). In both cases (assumed exhaust backfire) when the engine ticks over the first few time the mix may be to rich and not ignite or just not ignite due to cold/other reasons. Result extra fuel/air mix ends in the exhaust, result, backfire. Good luck |
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April 16th, 2009, 11:14 AM | #31 |
The Grand Royal
Name: Cochese
Location: Unmarked Rustbox
Join Date: Dec 2008 Motorcycle(s): 2009 Ninja 250R Posts: 258
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Mine hasn't yet in 200 miles.
We'll see after the mods. |
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April 17th, 2009, 01:04 AM | #32 |
Ramen Rider
Name: Gary
Location: Honolulu, Hawaii
Join Date: Jan 2009 Motorcycle(s): 2015 BMW R1200R, 08 Honda VFR800A (sold), 09 Ninja 250R (sold) Posts: A lot.
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man, i thought i was in the clear. 1300 miles and had my first backfire at start up tonight. startled me a bit. hope it isn't the beginning of a trend.
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April 17th, 2009, 06:34 AM | #33 |
motorcycle rider
Name: Bruce
Location: Victoria, BC
Join Date: Apr 2009 Motorcycle(s): '14 Yamaha V-Star 650 Custom (silver) Posts: A lot.
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Hmm. My 2008 let loose with a hellacious backfire yesterday when starting up. That is only the second or third time in over 2000 miles. It had only sat cold over night, and I was starting it the usual way - choke, no throttle.
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'14 Yamaha V-Star 650 Custom (silver) |
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April 17th, 2009, 02:27 PM | #34 |
one disaster at a time
Name: Jody
Location: West Georgia
Join Date: Aug 2008 Motorcycle(s): EX250J9 Posts: 411
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My second backfire this week at around 850 miles.
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April 21st, 2009, 02:38 PM | #35 |
ninjette.org member
Name: Matt
Location: Keller, TX
Join Date: Dec 2008 Motorcycle(s): 2008 Ebony Ninja 250R Posts: 137
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My '08 has about 4,500 miles on it and it has backfired twice in the past week. It's normally around 60-65 degrees in the morning here. It's getting to where I cringe before I hit the button.
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April 21st, 2009, 04:39 PM | #36 |
ninjette.org member
Name: D
Location: cali
Join Date: Mar 2009 Motorcycle(s): 2009 Kawi Ninja 250R Posts: 114
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I just popped my backfire cherry today at 5XX miles. hahah it really surprised me.
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April 21st, 2009, 04:53 PM | #37 |
ninjette.org sage
Name: patricK
Location: San Jose, CA--BAY AREA!
Join Date: Mar 2009 Motorcycle(s): '08 blue 250R [sold]. '09 lime ZX-6R [stolen :( ]. '06 blue 636. Posts: 918
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April 27th, 2009, 01:14 PM | #38 |
ninjette.org member
Name: James
Location: Ontario
Join Date: Apr 2009 Motorcycle(s): 2009 250r special edition Posts: 84
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i have a feeling it might have somthing to do with letting the bike idle for a few seconds before you shut it down...at least thats the way it is with my sled and stuff
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April 27th, 2009, 01:22 PM | #39 |
ninjette.org sage
Name: David
Location: Wellington, New Zealand
Join Date: Dec 2008 Motorcycle(s): 08 Ninja 250R in Green! (Sold) Now 2011 Triumph Daytona 675 SE Posts: 564
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I usually let my bike idle for 10-15 seconds after a ride before shutting it down and the backfire is not a common occurance. So I don't think it is that.
__________________________________________________
2008 GREEN Kawasaki Ninja 250R. AreaP Quiet Core Carbon Fibre : 8000k HIDs : Dynojet Jet kit : Double Bubble Windscreen |
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April 27th, 2009, 01:24 PM | #40 |
ninjette.org member
Name: James
Location: Ontario
Join Date: Apr 2009 Motorcycle(s): 2009 250r special edition Posts: 84
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Maybe why that's why its not a common occurrence ? left over fuel in the exhaust system maybe ? Backfiring can also occur in carbureted engines that are running lean where the air-fuel mixture doesnt have enough fuel and the timing too advanced.
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