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Discussion Starter · #1 ·
what exactly is jetting? where can i have it done at? i have a 2001 ninja 250 and i want a little more power out of it. along with jetting can i get a K&N filter too?
 

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Jetting can be done by yourself or you can pay someone. It's really not that difficult.

Jetting allows your carbuerator to send more fuel by changing the main jet on your carbs. If you change the airbox to K&N individual filters you will be allowing additional air to come into your engine which requires a different set of jets to accomodate the additional air.

Stage 1 give you overall gains in riding range. Can you use stock airbox.

Stage 3 will give you the best performance gains - you can either go with stock pipe (less gain) or aftermarket pipe and get the most out of your bike for a little money.
 

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Jet kits are available at www.Dynojet.com or Factory Pro makes one for our bike. I'm sure our sponsor can get one for you. Call Beartooth.


800-556-3098.
 

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what kind of exhuast would be good for the ninja 250r after its been jetted.. one that is too cheap and one that isn't too expensive like the yoshimaru pipes... quality mid-ranged pipes

thaNKs
JaMEs
 

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pipes

change not only the can/muffler but het pipe and make sure to get a new exhaust gasket...the K&N air pods, and the jetting can be done at home. bu tIF there is a dyno shop in te area they will get the most out of it. Yo wnat mre power/weight, remove the centerstand, remove about half of your inf not all of your rear fender, get a racing or even touring windscreen, if yo aare short legged shave your seat, or buy a Corbin Gunslinger seat...get rid of cheap toires and get some sticky ones as you will ned better traction when you have the power gains...flush mount LED turnsignals...and get LED's for your tail/brake lights. Definately get a call to Beartooth 800-556-3098 and order at least the Service Manual for your model...
 

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yoassizmine said:
what kind of exhuast would be good for the ninja 250r after its been jetted.. one that is too cheap and one that isn't too expensive like the yoshimaru pipes... quality mid-ranged pipes

thaNKs
JaMEs
Better to go with a full pipe system and Stage 3 upgrade at the same time. You will have to rejet if you don't. Don't forget that you'll also have to pick up some K&N filters as well. You can always sell your parts on ebay when you upgrade and get a few bucks out of it.

Muzzy would be my choice.
 

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YOu wouldn't need to get a k&n filter or any other filter if you don't get a dyno jet kit or is k&n filteers recommended?
 

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K&N FILTER

The K&N breathes easier and allows more air to pass...and it will last longer. It too is a wash and re-oil filter... A dyno is NOT required, but if you are going to go all the way to Stage III you should/recommended that yo go to a shop and have them tweak it for perfection...Running to lean will cause you some some severe long term problems, burnt valves, overheating, preignition...things very expensive to replace...and labor intensive...getting the job done once and done right is well worth the money paid... Air pods are awesome and allow much more airflow than an airbox could normally handle like on a 250R. There are many ways to improve performance without even changing or working on the carb...airbox or exhaust system...
 

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yoassizmine said:
YOu wouldn't need to get a k&n filter or any other filter if you don't get a dyno jet kit or is k&n filteers recommended?
Not sure what you are talking about, but he was asking what was involved with going with a stage 3 kit. I have not seen any stage 3 kits that did not require to upgrade the OEM filters to individual pods or the combined 2 pods in 1 deal for a Ninja 250. K&N is what is recommended by Dynojet.
 

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Yeah, getting carried away

Just figured that IF I was going to do the stage III i would definately want to do all the changes BEFORE I paid for a dyno job... or add everything then change things around...I'd go ALL the WAY...if I went to stage III
 

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The jets are little holes in the carburetor for the gas to go through. Bigger holes allow more gas. They are easy to change once the carburetor is out of the bike -- just unscrew the old jet, and screw in the new one.

The way I look at it, rejetting is to fix the problems created by changing the exhaust or airbox. I wouldn't rejet in order to get performance improvements.

But you can increase your airflow by installing K&N pods. And you can decrease your weight by changing the exhaust. Then you'll have to rejet so you don't burn your valves.

On a 250R, if you install the K&N pods, that will make rejetting a lot easier than if you keep the stock airbox or the K&N filter. Unless you modify your carburetor, you will have to remove it from the bike to change the jets. And removing it is a whole lot easier if you have K&N pods.
Curt
 

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gees

Thanks Curt! Then you ca remove the dead weight anchor (oops) centerstand, shae off some rear fender...bunches of tengs...including getting that taller windscreen...
 

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Someone needs an Owners Manual

Someone needs a Service Manual as well. You hae to have a Service manual to properly do many of the chores on your bike...Certain things have to be checked and tightened to a specific tightness, and you need specific temperature plugs...etc. Running lean is when your fuel/air mixture is to lean (not enough fuel for the air), it caused the motor to overheat and you can ruin a motor, by overheating things such as the head or valves, melt pistons... Alcohol will run in dragsters but their main jets (fuel jets) are much larger so it needs more alcohol per same olume of air, that a gas engine needs to run...you get more power out of alcohol, but it has a seriously low flash point...lots of things...like in hte race pits when ther is afuel leak and you can't see the flames, yet people are burning....that's a type of alcohol...anyway....the airbox contains your airfilter...it clans the air going to the carbs then the carbs mix the incoming air with gas at a specific ratio and walla'''you have a vapor that is perfect for combustion when it is compressed and hte spark ignites it...
Running a K&N filter or going to K&N pods will allow more air to pass, and if you have airpods you can get to the carbs easier... the engine and tming is like a fulcrum like the bar in a see-saw. You move the air easier and you need to improve the exhaust too. You improve the exhaust yo uned to improve the fuel...to keep things ballanced..or you run to rich/lean...
 

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Discussion Starter · #18 ·
ok so where can i get the K&N pod filter thingy? and who sells all the bdoy parts for the 250r? like where can i get a new windscreen? rearfender? stuff like that. the only thing ive seen for the ninja 250 is an exhaust. So if i put a Muzzy Full system exhaust i would need to rejet?
 

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Discussion Starter · #19 ·
well say i buy the stage 3 jet from DynoJet. and i also get a exhaust and filter. would i have to do any custom tuning? or get a jet system ment for my mods? also where can i get the KN pod thingy
 

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yoassizmine said:
zx-2r what did you mean when you said Running to lean?
He already answered it, but I'll use some different words to say the same thing.

Your engine needs the right mix of fuel and air. Too much fuel means that you don't have enough oxygen to burn it all. That's called being rich. In finances, being rich is good, but for motorcycles it's bad. When you don't have enough air, you will leave carbon deposits on your pistons, cylinders, and spark plugs, and in your oil. That is hard on the engine. You can get that same stuff going through your headers, muffler, and tailpipe. If it's really bad, you'll see black smoke coming out your exhaust. And, of course, you will get poor performance and gas mileage.

On the other hand, if you have too little fuel, that's called running lean. That raises the operating temperature in the cylinder. One of the more sensitive parts is the valves, and they can get burned from the excessive heat. You don't want that.

A good mechanic can observe how an engine sounds, smells, and performs, and adjust the mixture accordingly. A professional can also check the combustion gases (oxygen, carbon dioxide, carbon monoxide) to determine efficiency, and adjust it accordingly.

yoassizmine said:
and also what is the airbox?
That is the black plastic box where your air filter is. It's kind of tucked in right in front of the battery on a stock 250R. Right now would be a good time for you to get a look at it, and clean that air filter. You'll be amazed how much more power that 250 can give you with a clean air filter.

blue blurr said:
ok so where can i get the K&N pod filter thingy? and who sells all the bdoy parts for the 250r? like where can i get a new windscreen? rearfender? stuff like that. the only thing ive seen for the ninja 250 is an exhaust. So if i put a Muzzy Full system exhaust i would need to rejet?
If you're looking for sources for parts, try these:
1. Your local dealer. If they can't get it, they can tell you where to get it.
2. Beartooth Kawasaki.
3. Online places, like www.ronayers.com www.bikebandit.com www.parts411.com and www.denniskirk.com .

For aftermarket fairings, Airtech is the king. For a windscreen, try http://www.members.aol.com/dukestor/ . I'm going to try one of those windshields and see how I like it. They are only $55. For the rear fender, you can do it yourself. Just cut off the parts you don't want, and make a little bracket to hold the license plate.
Curt
 
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