Hello from sub zero temperature montana. If you have a foam air filter it depends on a sticky coat of oil on the foam to stop the dirt. From years and years of experience I say use the heavy sticky oil. Both yamaha and honda sell foam filter oil that is super sticky. At the shop where I work we also make air filters out of the bulk sheets of uni filter material. I always oil the heck out of any foam filter. When you first start the motor it will run a bit rich but the excess oil will get sucked thru or drip off. My choice when confronted with no proper air filter oil would be to use 90 weight gear oil. First clean your filter then air dry it then soak it in your best oil. Then gently squeeze out the excess. Then if the weather isn't to cold go ride the devils backbone road that leads to the interior from the coast near where you are.
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