Jetting for K&N Pods

1994Ninja250F · November 21st, 2010, 01:54 PM

Hello,

This is my first post here, although I've been a long-time lurker. Nice to meet all of you

Anyways, I have a 1994 Ninjette that I bought this past summer. I bought some K&N pod air filters to replace the airbox, and re-jetted the bike accordingly. I have Keihin #110 mains, and 3 washers under each needle.

Here's the issue: Under acceleration as the bike passes through 5-6K RPM, the bike sounds like it's "coughing" through the intake. It's more of a "bogging" feeling, as opposed to a "cutting out" feeling that it would have if it was lean. For example, when I first bought the bike it had the common mid-range stumble caused by the lean-from-factory jetting, which I fixed. This "bogging" feels nothing like what it was doing when I know for a fact it was lean, which makes me believe the bike is jetted too rich.

Some people at N250RC feel that the bike is too lean as opposed to too rich, but I don't know. After the 5-6K bogging, the bike pulls hard under WOT. Also, the exhaust is VERY stinky and I get about 220 miles to the tank. My elevation is 900 feet above sea level, and I have stock exhaust.

Thanks in advance for the help

kkim · November 21st, 2010, 03:08 PM

have you read this?
http://faq.ninja250.org/wiki/How_to_...ng#Carb_Tuning

2WheelGuy · November 21st, 2010, 03:23 PM

You are going to need new needles to run without an airbox. Factory Pro, K&N etc.

nate-bama · November 21st, 2010, 06:07 PM

shim your needles and run 108's with stock exhaust..i have several threads on this bull ****...i i run 108's with a k&n and factory pro kit ( waste o money) washers do the same trick..full muzzy exhaust ..bull **** as well keep ur stock exhaust

the intake is where the 250 is strangled

1994Ninja250F · November 22nd, 2010, 09:23 AM

Quote:

You are going to need new needles to run without an airbox. Factory Pro, K&N etc.

Really? I've never heard this before. I know lots of the guys on N250RC just buy the jets and use the washers and they all get their jetting spot-on.

Quote:

shim your needles and run 108's with stock exhaust..i have several threads on this bull ****...i i run 108's with a k&n and factory pro kit ( waste o money) washers do the same trick..full muzzy exhaust ..bull **** as well keep ur stock exhaust the intake is where the 250 is strangled

Yeah I do plan on keeping the stock exhaust, since I really value my centerstand

. In my limited experience with jetting though, it's my understanding that if you have the bike WOT and it's pulling hard, that means that your main jet is probably correct. When I give it WOT it does pull hard. It feels like my problem is in the mid-range only, so I guess I'l mess around with 4 washers under each needle, then try it with only 2 washers since I'm still not sure if it's rich or lean.

Thanks for the help guys

Tony B · November 25th, 2010, 09:34 AM

A good pointer to whether you're rich or lean is to slightly shut the throttle just as you reach the 'bog down' point, if the bike responds well, you're probably on the rich side.

1994Ninja250F · November 25th, 2010, 07:51 PM

Quote:

Originally Posted by Tony B

A good pointer to whether you're rich or lean is to slightly shut the throttle just as you reach the 'bog down' point, if the bike responds well, you're probably on the rich side.

Thank you! I will try that out as soon as the rain lets up.

ryu hayabusa · November 25th, 2010, 09:32 PM

not trying to jack a thread, but would this same thing be needed if you get a K&N drop filter for the OEM air box?

1994Ninja250F · November 28th, 2010, 01:00 PM

Quote:

Originally Posted by ryu hayabusa

not trying to jack a thread, but would this same thing be needed if you get a K&N drop filter for the OEM air box?

No you don't have to re-jet.

fjyang · January 21st, 2011, 03:42 PM

Quote:

Originally Posted by 2WheelGuy

You are going to need new needles to run without an airbox. Factory Pro, K&N etc.

Agreed about the needles. I got a Yoshi pipe and k&N pod filters, I shim the stock needles up to 4 shims and still won't run right, then I swap the 4 shims to K&N needles and its spot on. The needle shape are different between stock and K&N's. The K&N's needles are more taper and slender towards the tip and therefor flows more efficient and more fuel. You probably could shim it up to 5 on stock needles and get the same results.

I run 115 main jet which is tiny bit more then the biggest jet (114) provided by K&N and its a blast to ride at the upper rpm range.

I'm located in CA so my jetting range only applied to my area, if you live in different altitude and humidity, chances are, your jetting will be different then mine.

Also swap out the pilot jet for a bigger size and it help with the cold start and idle problems that all Ninja suffers.

Jinx250 · January 25th, 2011, 11:44 AM

Take the shims off your needles and see how she does. Add them 1 at a time to see which way it goes. IMO aftermarket needles don't live up to the hype.

November 21st, 2010, 03:23 PM	#3
2WheelGuy ninjette.org certified postwhore Name: Craig Location: Silicon Valley, CA USA Join Date: May 2009 Motorcycle(s): '98 EX250, '02 EX250, '08 250r, '03 SV650, '98 GSXR750 '03 Hayabusa, '87 YSR50, '84 ZX900, +MORE Posts: A lot.	You are going to need new needles to run without an airbox. Factory Pro, K&N etc. __________________________________________________ CraigHarris.org Pacific Track Time CraigsWeb See you at 2014 MotoGP Laguna Seca! We'll be camping on Fox Hill. AFM #278

November 21st, 2010, 06:07 PM	#4
nate-bama North Alabama Mtn. ryder Name: Nate Location: Alabama Join Date: May 2009 Motorcycle(s): 2006 Posts: 537	shim your needles and run 108's with stock exhaust..i have several threads on this bull **...i i run 108's with a k&n and factory pro kit ( waste o money) washers do the same trick..full muzzy exhaust ..bull ** as well keep ur stock exhaust the intake is where the 250 is strangled __________________________________________________ QTRltrPWR

November 25th, 2010, 09:32 PM	#8
ryu hayabusa ninjette.org member Name: ion Location: central oregon Join Date: Aug 2010 Motorcycle(s): 2000 ninja 250r Posts: 119	not trying to jack a thread, but would this same thing be needed if you get a K&N drop filter for the OEM air box? __________________________________________________ never argue with an idiot. it only brings you down to his level, and then he beats you, because he has more experience.

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November 21st, 2010, 01:54 PM	#1
1994Ninja250F ‘94 Rider Name: Colin Location: Lewis Center, Ohio Join Date: Nov 2010 Motorcycle(s): 1994 Kawasaki Ninja EX250F Posts: 81	Jetting for K&N Pods Hello, This is my first post here, although I've been a long-time lurker. Nice to meet all of you Anyways, I have a 1994 Ninjette that I bought this past summer. I bought some K&N pod air filters to replace the airbox, and re-jetted the bike accordingly. I have Keihin #110 mains, and 3 washers under each needle. Here's the issue: Under acceleration as the bike passes through 5-6K RPM, the bike sounds like it's "coughing" through the intake. It's more of a "bogging" feeling, as opposed to a "cutting out" feeling that it would have if it was lean. For example, when I first bought the bike it had the common mid-range stumble caused by the lean-from-factory jetting, which I fixed. This "bogging" feels nothing like what it was doing when I know for a fact it was lean, which makes me believe the bike is jetted too rich. Some people at N250RC feel that the bike is too lean as opposed to too rich, but I don't know. After the 5-6K bogging, the bike pulls hard under WOT. Also, the exhaust is VERY stinky and I get about 220 miles to the tank. My elevation is 900 feet above sea level, and I have stock exhaust. Thanks in advance for the help

November 21st, 2010, 03:08 PM	#2
kkim Join Date: Nov 2008 Posts: Too much.	have you read this? http://faq.ninja250.org/wiki/How_to_...ng#Carb_Tuning

November 25th, 2010, 09:34 AM	#6
Tony B ninjette.org member Name: Tony Location: Surrey UK Join Date: Aug 2010 Motorcycle(s): GPX250 + many others! Posts: 184	A good pointer to whether you're rich or lean is to slightly shut the throttle just as you reach the 'bog down' point, if the bike responds well, you're probably on the rich side.

January 25th, 2011, 11:44 AM	#11
Jinx250 Smoker Name: Bob Location: SoCal Join Date: Dec 2010 Motorcycle(s): Guess.... Posts: 556	Take the shims off your needles and see how she does. Add them 1 at a time to see which way it goes. IMO aftermarket needles don't live up to the hype.