Am i running lean?

OGjackafidy · September 19th, 2011, 02:28 PM

So i put just the square kandn high flow air filter on and it seems to run at 1000 rpms at idle cold and then up to 1100 or 1200 warm which seems a little bit lower than usual. is it running lean and for the filter to function properly do i need to rejet?

bob706 · September 19th, 2011, 02:51 PM

shim or rejet. you're letting more air in so you leaned it out

EsrTek · September 19th, 2011, 02:53 PM

Just changing the filter would not require rejet or shim the carbs.

Hell on my bike I only changed the air filter (pipercross) and my exhaust smelled rich, (been told these bikes run rich from stock) so I removed the snorkel... been told to shim the carbs doing this method (air filter & remove snorkel) but I haven't done that yet and mine seems to run just fine and the exhaust doesn't smell as much like gas. Plus I haven't noticed anything on the rich vs lean type threads happening on my bike, so not soo sure it's 'mandatory' to shim the carbs.

DaBlue1 · September 19th, 2011, 03:04 PM

Quote:

Originally Posted by OGjackafidy

So i put just the square kandn high flow air filter on and it seems to run at 1000 rpms at idle cold and then up to 1100 or 1200 warm which seems a little bit lower than usual. is it running lean and for the filter to function properly do i need to rejet?

As the outside temp changes you may need to adjust the idle slightly. Cooler outside temps may make it idle a little lower.

OGjackafidy · September 19th, 2011, 04:21 PM

that could be. im planning on ordering a dynojet stage 2 friday when i get my paycheck so hopefully it will all work out. is it a must to remove the snorkel when you rejet?

DaBlue1 · September 19th, 2011, 04:51 PM

Quote:

Originally Posted by OGjackafidy

that could be. im planning on ordering a dynojet stage 2 friday when i get my paycheck so hopefully it will all work out. is it a must to remove the snorkel when you rejet?

When you rejet you will be adding more fuel, so you need to add more air. Removing the snorkel does this to a small degree. Depending on your main jet size, airbox removal is necessary. Main jet sizes of #105 or bigger will benefit better from pod filters.
You can check the jetting database to see what others have done. Having your bike Dyno Tuned wil help you get the most out of rejetting your bike.

http://www.ninjette.org/forums/showt...tting+database
http://www.ninjette.org/forums/showthread.php?t=10208

Monkey Wrench Cycles · September 19th, 2011, 05:23 PM

Running lean will NOT make it idle lower. A high idle, taking awhile to idle down, or in extreme cases, won't stay running are symptoms of a lean condition.

Also these bikes, like every modern day bike run lean from the factory due to emissions laws and manufacturers desire to make the bikes pass the smog test. I have yet to meet a bike that didn't love me after a rejet or in FI models a PCIII.

My advice is check idle, plugs, and rejet just so your bike will run like it should've when it rolled off the assembly line

blink · September 19th, 2011, 05:43 PM

dont you want a bigger bike in a couple months?

OGjackafidy · September 19th, 2011, 07:06 PM

I do want one but my hours got cut at work so for the time being im gonna stick with the 250 and see what next summer brings and either way im not selling the ninja so i may as well work on some mods

September 19th, 2011, 02:51 PM	#2
bob706 ninjette.org certified postwhore Name: Sean Location: Mary Esther, FL Join Date: Jan 2009 Motorcycle(s): 2008 Ninja 250 1998 HD Road King Posts: A lot.	shim or rejet. you're letting more air in so you leaned it out __________________________________________________ http://sandollarmotorcycleclub.com/

September 19th, 2011, 04:21 PM	#5
OGjackafidy ninjette.org member Name: Jack Location: columbia MO Join Date: Jun 2011 Motorcycle(s): Red 2009 Ninja 250r Posts: 132	that could be. im planning on ordering a dynojet stage 2 friday when i get my paycheck so hopefully it will all work out. is it a must to remove the snorkel when you rejet? __________________________________________________ "The goal in life is to die young at a very old age" " Four wheels moves the body, two wheels moves the soul'

September 19th, 2011, 05:23 PM	#7
Monkey Wrench Cycles Motorcycle repair Name: Frank Location: Fort Worth, Texas Join Date: Sep 2011 Motorcycle(s): '05 Ninja ZX6-RR, '08 GY6 scooter for wife, '02 Shadow ACE, '05 Buell Blast Posts: 28	Running lean will NOT make it idle lower. A high idle, taking awhile to idle down, or in extreme cases, won't stay running are symptoms of a lean condition. Also these bikes, like every modern day bike run lean from the factory due to emissions laws and manufacturers desire to make the bikes pass the smog test. I have yet to meet a bike that didn't love me after a rejet or in FI models a PCIII. My advice is check idle, plugs, and rejet just so your bike will run like it should've when it rolled off the assembly line __________________________________________________ "You can't know where you're going until you know where you've been" www.monkeywrenchmotorcycles.com

September 19th, 2011, 05:43 PM	#8
blink Always. Name: Alex Location: Calgary, AB Join Date: Mar 2011 Motorcycle(s): '08 Ninja 250, '05 GSX-R600 Posts: A lot.	dont you want a bigger bike in a couple months? __________________________________________________ blink-182

September 19th, 2011, 07:06 PM	#9
OGjackafidy ninjette.org member Name: Jack Location: columbia MO Join Date: Jun 2011 Motorcycle(s): Red 2009 Ninja 250r Posts: 132	I do want one but my hours got cut at work so for the time being im gonna stick with the 250 and see what next summer brings and either way im not selling the ninja so i may as well work on some mods __________________________________________________ "The goal in life is to die young at a very old age" " Four wheels moves the body, two wheels moves the soul'

September 19th, 2011, 02:28 PM	#1
OGjackafidy ninjette.org member Name: Jack Location: columbia MO Join Date: Jun 2011 Motorcycle(s): Red 2009 Ninja 250r Posts: 132	Am i running lean? So i put just the square kandn high flow air filter on and it seems to run at 1000 rpms at idle cold and then up to 1100 or 1200 warm which seems a little bit lower than usual. is it running lean and for the filter to function properly do i need to rejet? __________________________________________________ "The goal in life is to die young at a very old age" " Four wheels moves the body, two wheels moves the soul'

September 19th, 2011, 02:53 PM	#3
EsrTek ninjette.org certified postwhore Name: Eric Location: Murfreesboro, TN Join Date: Jun 2011 Motorcycle(s): '13 300 Posts: A lot.	Just changing the filter would not require rejet or shim the carbs. Hell on my bike I only changed the air filter (pipercross) and my exhaust smelled rich, (been told these bikes run rich from stock) so I removed the snorkel... been told to shim the carbs doing this method (air filter & remove snorkel) but I haven't done that yet and mine seems to run just fine and the exhaust doesn't smell as much like gas. Plus I haven't noticed anything on the rich vs lean type threads happening on my bike, so not soo sure it's 'mandatory' to shim the carbs.

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