07 GSXR750... is my bike running lean??? - TwoWheelForum: Motorcycle and Sportbike forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 22 (permalink) Old 02-01-2007, 01:31 AM Thread Starter
 
Join Date: Sep 2004
Posts: 63
07 GSXR750... is my bike running lean???

hi guys,
i have an 07 gsxr 750. i just put a jardine gp pipe on it. looks and sounds great. i am so happy with it... but... it throws out a flame sometimes. after an acceleration and getting off the throttle, it will thow out a flame and give a popping sound. is this bad. i am saving up for a power commander but am not riding my bike right now because i dont want to hurt the motor. please let me know if its ok to be riding it or if i should stay off it till i get my power commander. thanks,
troy moore
ProRider199 is offline  
Sponsored Links
Advertisement
 
post #2 of 22 (permalink) Old 02-01-2007, 02:21 AM
 
Join Date: Nov 2005
Posts: 833
Quote:
Originally Posted by ProRider199 View Post
hi guys,
i have an 07 gsxr 750. i just put a jardine gp pipe on it. looks and sounds great. i am so happy with it... but... it throws out a flame sometimes. after an acceleration and getting off the throttle, it will thow out a flame and give a popping sound. is this bad. i am saving up for a power commander but am not riding my bike right now because i dont want to hurt the motor. please let me know if its ok to be riding it or if i should stay off it till i get my power commander. thanks,
troy moore
It does sound lean. By adding aftermarket exhaust you have increased the flow of air without increasing the flow of fuel. You need to re-map the fuel control. I would not ride it as is- you can burn the valves as well as the pistons.
TOMMYTOM is offline  
post #3 of 22 (permalink) Old 02-01-2007, 08:33 AM
TWF Board Of Directors
 
Join Date: Jun 2006
Posts: 10,074
I think you're running too rich. You decreased the back pressure in the engine but you didnt free up the intake side. You need to get a BMC race air filter to even out the air flow. The popping and flames that you see is unburnt gas that is getting burnt when it goes through the exhaust can. You may still want to get a PC at some point but you definitely need a high flow air filter first.
Rider is offline  
Sponsored Links
Advertisement
 
post #4 of 22 (permalink) Old 02-01-2007, 01:02 PM
 
Join Date: Jan 2006
Posts: 2,017
Quote:
Originally Posted by TOMMYTOM View Post
It does sound lean. By adding aftermarket exhaust you have increased the flow of air without increasing the flow of fuel. You need to re-map the fuel control. I would not ride it as is- you can burn the valves as well as the pistons.
right you are... the extra air will increase exhaust temp and re-ignite exhaust gases. a rich mixture will cool it down but can sometimes re-ignite if the bike was running at track speeds.

me wonders why O2 sensors are not part of motorcycle EFI systems.

-a|ex

edit: forgot to mention, check your plug color for overheating. stock bikes generally are lean from the factory to pass emmisions. they suck at low to mid range.

Last edited by Back _Marker; 02-01-2007 at 01:24 PM.
Back _Marker is offline  
post #5 of 22 (permalink) Old 02-01-2007, 01:08 PM
 
Join Date: Feb 2005
Posts: 17,886
Some bikes will spit flames regardless. It's not uncommon on bikes with pipes. I had a Power Commander on my '04 R6 and it would spit flames with a slip-on and later when it had a full system. The PC was adjusted to my full system too.

DLIT is offline  
post #6 of 22 (permalink) Old 02-01-2007, 01:44 PM
 
Join Date: Nov 2006
Posts: 2,181
Quote:
Originally Posted by DLIT View Post
Some bikes will spit flames regardless. It's not uncommon on bikes with pipes. I had a Power Commander on my '04 R6 and it would spit flames with a slip-on and later when it had a full system. The PC was adjusted to my full system too.

that pix is FU*CKEN SICK MAN FU*K YEAH
YZFR61ST is offline  
post #7 of 22 (permalink) Old 02-01-2007, 05:16 PM Thread Starter
 
Join Date: Sep 2004
Posts: 63
yea...nice pic.. i think it looks sick with the flames coming out. but thanks guys, i appreciate all the reply's.

troy moore
ProRider199 is offline  
post #8 of 22 (permalink) Old 02-01-2007, 05:34 PM
 
Join Date: Jun 2006
Posts: 468
I have a Devil slip on on mine and a K&N filter, still no PCIII and thats how I race, Ride ur bike man, once u put on that filter and everyting beggins to flow better ull be fine, the flame BTW is that the pipe hasnt yet carbonized properly, itll pass.
Cant get it down!!! is offline  
post #9 of 22 (permalink) Old 02-05-2007, 01:48 AM Thread Starter
 
Join Date: Sep 2004
Posts: 63
Quote:
Originally Posted by Cant get it down!!! View Post
I have a Devil slip on on mine and a K&N filter, still no PCIII and thats how I race, Ride ur bike man, once u put on that filter and everyting beggins to flow better ull be fine, the flame BTW is that the pipe hasnt yet carbonized properly, itll pass.
cool yea.. i just ordered my pcIII for real cheap so i thought i should take advantake and get it anyways. i plan on putting a better air filter on it soon. o yea and the flame thing is bad ass, ill have to post some pics soon. if it still does it thanks man
ProRider199 is offline  
post #10 of 22 (permalink) Old 02-05-2007, 08:48 PM
Factory Racer
 
jalaan1's Avatar
 
Join Date: Jan 2007
Location: LI, NY
Posts: 2,022
flame bad or good....

that ish looks hott when it does happen! lol

'99 Kawasaki Ninja ZX-7R, My 3/4 Liter
".. speed, you can't touch it, but you damn sure can feel it! "
jalaan1 is offline  
post #11 of 22 (permalink) Old 02-06-2007, 06:52 PM
 
Join Date: Jun 2006
Posts: 468
A blue flame indicates its running lean

An orange flame indicates its running rich

mine is blue I need a PCIII ASAP!!!
Guess I'll talk to my sponsor...hehehe

A yellow flame like the one in the pic of da Yamaha is fine though.

Last edited by Cant get it down!!!; 02-06-2007 at 06:54 PM.
Cant get it down!!! is offline  
post #12 of 22 (permalink) Old 02-08-2007, 12:52 PM
 
Join Date: Apr 2006
Posts: 2,142
Quote:
Originally Posted by DLIT View Post
Some bikes will spit flames regardless. It's not uncommon on bikes with pipes. I had a Power Commander on my '04 R6 and it would spit flames with a slip-on and later when it had a full system. The PC was adjusted to my full system too.

I always thought that meant you had a [email protected]$$ bike. which isnt necessarily lying about the R6 either.
King Bob is offline  
post #13 of 22 (permalink) Old 02-08-2007, 02:40 PM
 
Join Date: Aug 2006
Posts: 2,550
My 06gsxr600 does the exact same thing, heres a quick fix that helped mine, disconnect the battery for 20 min then try it again. Sometimes your comp can re adjust "alittle" but now always.
BravoX1 is offline  
post #14 of 22 (permalink) Old 02-08-2007, 05:15 PM Thread Starter
 
Join Date: Sep 2004
Posts: 63
thanks... its all good now.. i just bought my pc so ill be putting that on today, woo hoo.. and i get my bike out of the shop too

troy
ProRider199 is offline  
post #15 of 22 (permalink) Old 02-11-2007, 12:01 AM
 
Join Date: Dec 2006
Posts: 16
When Putting that PCIII On... Take The Bike to A Dyno Get A... A/F Reading Done... Have It Mapped... All Bikes are Diffrent... To Make the Most Power... Have IT MAPPED...
Stedmanmotorsports is offline  
post #16 of 22 (permalink) Old 02-11-2007, 02:07 AM Thread Starter
 
Join Date: Sep 2004
Posts: 63
Quote:
Originally Posted by Stedmanmotorsports View Post
When Putting that PCIII On... Take The Bike to A Dyno Get A... A/F Reading Done... Have It Mapped... All Bikes are Diffrent... To Make the Most Power... Have IT MAPPED...
yea for sure... im waiting on an air filter and some money for the dyno tune
ProRider199 is offline  
post #17 of 22 (permalink) Old 02-12-2007, 04:35 PM
 
Join Date: Feb 2005
Posts: 17,886
Quote:
Originally Posted by ProRider199 View Post
yea for sure... im waiting on an air filter and some money for the dyno tune
Good man. Get a BMC air cleaner. K&N's aren't the best performing filters for bikes. Be prepared to drop a couple hundred bucks to have it dyno-tuned. Money well spent, if you ask me.
DLIT is offline  
post #18 of 22 (permalink) Old 02-12-2007, 06:42 PM
 
Join Date: Aug 2004
Posts: 2,394
If you take that R6, coming around that bend at say 10,000 RPM, the crank spins at 166 revolutions in one second. So in that one second, each piston goes from a dead stop to about two inches, comes to another dead stop, and accelerates madly to a dead stop again 166 times. Incredible.

But the valves are also moving madly letting in gas, closing, and exhausting. During those 166 revolutions, the spark plugs are sparking every time the piston comes up near TDC. Wait, that means the spark plug is not only firing on the compression stroke, it's also firing when a piston is compressing the exhaust out the exhaust pipe. That means that if there is any unburned fuel (running rich) in the exhaust it will burn.

Not that I've ever done it, but have you ever changed spark plug wires on a V8 and got them on wrong. Weird things can happen like a spark in a cylinder when the intake valve is open. Flame up through the carb. A spark when the exhaust valve is open won't be bad unless it's running real rich, when a spark can blow off the muffler. Don't ask how I know this.
No Worries is offline  
post #19 of 22 (permalink) Old 02-12-2007, 07:05 PM Thread Starter
 
Join Date: Sep 2004
Posts: 63
Quote:
Originally Posted by DLIT View Post
Good man. Get a BMC air cleaner. K&N's aren't the best performing filters for bikes. Be prepared to drop a couple hundred bucks to have it dyno-tuned. Money well spent, if you ask me.
so BMC huh? as of right now, i know a K&N will be better than stock and hear BMC is better than K&N. Is a BMC better filtered too or does the K&N filter out the dirt a little bit better? right now, i just want a better "filtered" filter
ProRider199 is offline  
post #20 of 22 (permalink) Old 02-14-2007, 01:58 AM
 
Join Date: Jul 2005
Posts: 24,016
Quote:
Originally Posted by No Worries View Post
If you take that R6, coming around that bend at say 10,000 RPM, the crank spins at 166 revolutions in one second. So in that one second, each piston goes from a dead stop to about two inches, comes to another dead stop, and accelerates madly to a dead stop again 166 times. Incredible.

But the valves are also moving madly letting in gas, closing, and exhausting. During those 166 revolutions, the spark plugs are sparking every time the piston comes up near TDC. Wait, that means the spark plug is not only firing on the compression stroke, it's also firing when a piston is compressing the exhaust out the exhaust pipe. That means that if there is any unburned fuel (running rich) in the exhaust it will burn.

Not that I've ever done it, but have you ever changed spark plug wires on a V8 and got them on wrong. Weird things can happen like a spark in a cylinder when the intake valve is open. Flame up through the carb. A spark when the exhaust valve is open won't be bad unless it's running real rich, when a spark can blow off the muffler. Don't ask how I know this.


Wild.



marko138 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TwoWheelForum: Motorcycle and Sportbike forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome