Which aftermarket air filters fit the Ninja 250?
From Ninja250Wiki
[edit] Air filter systems that will work on the Ninja 250The simplest are the UNI and K&N drop-in air filters, which replace the stock foam air filter in the airbox. For this kind of filter, you do not need to remove or modify the airbox, or change the carburetor jetting. There is no noticeable performance increase with drop-ins, and the K&N, at least, does not just "drop in". If you are willing to remove the airbox, you can use the K&N pod air filters, UNI pod air filters, or EMGO pods. The use of pod air filters slightly increases power. Due to the fact that you will be flowing much more air without the airbox, you will need to adjust the jetting in your carburetors after you install pod filters. [edit] NoiseOne thing to consider in changing to pod filters is that pods will significantly increase the amount of noise coming from your intake, compared to the stock airbox. [edit] Part numbers
[edit] Filter materialOne of the major differences between K&N and UNI is their filtration medium. K&N uses cotton gauze, while UNI uses foam. Although no one has had an Emgo apart yet, it also uses some form of cotton. Maintenance on these filters involves cleaning and oiling them, just like the stock filter. However, both companies recommend a spray oil, instead of the motor oil that you can get by with on the stock filter. When oiling these filters, make sure you get the proper oil for the type of filter that you have. Considering how seldom oiling needs to be done, it makes sense to use the oil made by the manufacturer of your filter. It is recommended that you clean and oil your filters at least once a year, more often if you ride under harsh conditions. [edit] Fitting considerationsK&N On the K&N's the limiting factor is that unless you are very careful, putting the second one on knocks the first one off because the carbs are so close together. UNI The low price of the UNI's does come with a slight penalty. The filters don't fit really well right out of the box, which hasn't kept many people from using them. There is a knob on the outside part of the carb inlet that doesn't allow UNI's to seat correctly. You either have to cut a slot in the rubber part of the pods for that knob (not easy), or file that knob out, which works better. If you don't do this, one of the pods will probably jump off. It doesn't have any place to go, so you won't lose it, but you'll hear it from your engine. Here are photos of 4" UNI pods on an EX250. Note that they do touch each other. This is normal. The left photo is at six months; the right is after three years. These were serviced regularly. Color change is unavoidable. The standard pods now come in black to start with. These are somewhat easier to work with than the stock airbox.
Here is a video clip of the 6" dual-layer UNI's. The 6" ones do fit, but they take up a lot of space. Most riders go with the 4" model. EMGO
These have been installed on E-series (1986-87) and F-series ('88-07) bikes. The only problem is that you have to grind a bit of the chrome lip off to make them fit, as they touch each other, just like the UNI and K&N ones. Don't take off enough to break the seal. The picture makes it look like more work than it actually is.
The left photo shows them mounted on the 32mm '86-87 carbs; the right on '88-07 30mm ones. Same Emgo part # for both applications.
[edit] CostThe K&N drop-in typically costs $50-60. A UNI drop-in is around $15. The K&N pods cost $55-80 for a set, while UNI pods are $15-20 each, times two. EMGO filters are about $20 for a pair. Careful Google searching will find good prices on any of these filters. [edit] Attention AustraliansOne of our members posted that he could not find the K&N RC-1822 in Oz. He did find # KNRC-1820 from Rocket Industries, though. |
