Slight pop and sputter after filter cleaning?

Properly Cleaning the air filter should only result in a better running engine.

What kind of "garage" did you take it to. An ATV's reusable foam filter is unlike anything typically found in car. What did they clean it with and how?
Using the wrong chemical can cause the foam to deterierate and lead to FOD in your carb. Did they romve the internal metal core?
Also once cleaned a tacky foamfilter spray should be applied.
What did you "oil" yours with?

This is all something you can do at home. Remove the internal metal core and wipe off if necessary. Clean the filter in warm water and dawn dishwashing liquid. Let is soak, rinse from the inside-out and use some more dawn by hand. Rinse and air dry overnight. Get some rubber surgeon gloves and wear them to work the spray lube into the filter. keeps your hand clean. Replace metal core and install sealing ring.

A clean filter leans your overall mixture. have you made any carb adjustments prior to cleaning the filter? Hopefully not. Try cleaning the filter the right way. Then maybe a new filter. Could anyting have gotten into the carb throat while the filter was off?

Hey G-Man, Thanks for the info. Now I know the way it should be cleaned. I took the filter off the metal cage and gave it to them. I'm not sure what was used but it was a chemical that smelled like brake cleaner if you're familiar with that. After I get back I rinsed it with water and it didn't act great, the water was beading off the chemical. Its very unlikely anything got into the carb, but I never say impossible. I had it out this weekend and it seems a little better but its still not right, sounds like a fouled plug? I'm wondering if whatever got in there fouled out the plug? I tried to get a new filter on Weds before I left but the local shop was closed so I had to deal with it. I'm going to try cleaning the carb out and replacing the filter and a new plug. I also need to change the oil on both my bikes so I'll do that at the same time. Oh and for the old filter, I put reg oil and wringed it out, thats what I was told before, I'll be sure to pickup the spray for the future. Thanks again. anything else you think I should know I appreciate it.

Ron