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Air cleaners are a real necessity. You are right to clean them and clean them often. You will be recompensed with long engine life for your righteous efforts. I once read a test on how much dirt was needed to ruin an engine. It was almost nothing. Seems the dirt gets imbedded in the soft aluminum of the piston and then just grinds away like sandpaper. Always run your bike with the air cleaner installed. Most motorcycle air cleaners are one of three types. Oiled foam is very popular with dirt bikes. On Oiled Foam filters the real filter is the oil. The foam is only a support for the oil. Sort of like a skeleton. You must oil the foam on these filters. If you do not, the filter will not work. To clean them, rinse in solvent several times or until clean. Then ring them out, and let them dry. Lastly, put on a fair amount of oil and work the oil into the foam with your hands. You can buy special air filter oil or use regular 30w engine oil. 90w gear oil also works good. Check your shop manual.

Some people say to dip the filter in the oil and then squeeze out the excess. This works, but the engine will usually run quite a bit rich for up to an hour or so, as the excess oil is pulled out of the filter, and into the engine. To avoid this, I drip a good quantity of oil all over the foam, inside, outside, and on the edges. Then, I work the oil in with my fingers and add some more till all parts of the filter are coated with oil. Sometimes, there is a coarser foam filter on the outside of the fine foam filter, clean and re-oil it the same as the fine foam filter. As you clean the foam, rub it somewhat roughly. If the foam easily rips or falls apart, get a new one. This type of filter will just fall apart with age. Ozone in the air, I guess. Anyway, if it easily rips, get a new one. Fabric filters, have a surgical type of fabric inside a metal mesh. They work very well and seem to flow a lot of air. They use a special oil you get from the air filter maker (K&N). Clean them with soap and water, let dry, and then re-oil.

With care, they last quite a while. Paper filter are used on a lot of street motorcycles. They work good when new and clean. If they get wet, they stop passing air. When they dry out, they usually start working again, but don't flow air as well as before getting wet. The water seems to stick the paper fibers together hurting the air flow. If the bike has been sitting a long time, the paper filters absorb water from the air and this starts to plug them up. While you can clean them somewhat by blowing with compressed air the only real way to clean them is to replace them with a new one. These are cheap to make and you would think to replace, but most times the big manufacturers want a lot of money for a new paper filter. If you can find them, after market paper air filters work good, but they don't always make them for all the models of motorcycle out there. A cheaper alternative might be a foam or fabric air filter. If you have an old bike and can't find an air filter for it, you can often make a copy of the original with air filter foam sheets (12"x16"x5/8"), like the one I've been cutting on to the left.

Uni sells them, and the price, about $15.00, isn't bad at all. I cut out the foam pieces I want and glue them together with hot glue and a Hot glue gun. Just remember to oil them, like all foam filters. You have to be careful changing air filter types on modern motorcycles. The seemingly restrictive airbox and air filter are often designed that way. If you change the airbox or air filter, it can make the bike run too rich or too lean. I had one V-twin Honda come in with a crack in the airbox. It would barely run, missing and popping. I replaced the air box (Quite the job.) and nothing else. It then ran perfectly. Another time I cleaned the carbs on a Kawasaki 440 twin. I tried to start it without it's pitiful, tiny, little air cleaner. It would barely run. Put the little foam air cleaner in and presto, changeo, runs great. Same with a Suzuki GS850. Pull the air cleaner cover and it would not idle. Put it back on, idles great. So remember, if you change things, you may have to re-jet the carb, and that's not always so easy.

Then again maybe not. I've run across lots of bikes both street and dirt, that don't seem to mind a filter or airbox change at all. You just never know. Fltron and Uni also make sock type air cleaners. These are especially helpful if the rubber air tube, going from the carb to the airbox, is old, rock hard and shrunk. Lots of times, on an old bike, you can't get a new air tube. So take the air box off and put on a sock air cleaner, clamping it on to the end of the carb. You might want to make some sort of cover for it to keep water off the foam. A word of warning here. Don't use just any rubber tube to replace an old, hard, shrunk, air tube. If the rubber isn't made for gas, (like a radiator hose) it can swell and/or flake and fall apart. You might find a rubber, gas filler tube, from an auto parts store. This is the tube that goes from the gas tank to the gas filler neck on most cars. It is made for gas. They come in a number of sizes, but most of them are too big, and they are a bit pricey.

Still, any port in a storm. One might work for you. If you are forced to use something like a radiator hose, run it for an hour or two and then wait overnight and take it off and check it. If it looks OK, run it a bit longer, but keep checking it often for swelling or some other kind of failure. As any air cleaner works, it gets dirty. For a while, on filter elements that you oil, the dirt may actually help the filter work by attracting more dirt. However, sooner or later the dirt starts to plug up the filter and this makes the engine suck too much gas. This causes rich running that wastes gas and carbon fouls the spark plug. Clean or replace the air cleaner at a regular interval. If you live in a dusty, rural area, you will have to service the air cleaner more often than if you ride in the city. A guy rode up to my shop on a RD350 Yamaha twin. He says it's running really ratty and that he's tried everything to fix it but it still carbons up the plugs. Says he's gone through dozens of plugs.