Filter Wraps can be a big help if you understand them. First let us state they all filters & wraps restrict the air flow to some degree. Holding them up to your mouth and blowing through them is no test. Foam filter raps are run dry, as they are intended to stop some of the dirt, sand and mud and gradually let it work it's way to the bottom and fall off. Never grease the bottom of the filter wrap and be sure it hangs over the lower outside edge of the filter housing. Don't think a nylon stocking works the same as the wrap made to keep sand out. After installing any filter wrap it is best to recheck carb jetting for best performance.

All K&N felt type filters and foam filters must be oiled before using. You can make an excellent filter oil by mixing 20% STP with 80% light weight motor oil. The STP keeps the oil from wicking out on a hot day and also seems to help keep out the water.

It only takes a hole the size of a toothpick to make your air filter useless. We always grease the top and bottom of the filter to help get a good air tight seal. Some filters have small slots in the base where they fit to the carb throat. The slots let the hose clamp tighten the filter base to the carb. The only problem is if the slot lines up with a slot in the hose clamp, you can end up with a hole directly above the top of the carb. If this happens your filter is useless.