I hate to say it, it will not be the air filter. Sounds like your button retaining clip might have fallen off.
I urge you to pull the Hyd head before doing anything else. I have seen the buttons destroyed from being hammered after they fall off. If it is just that it fell off, a new retaining...
Sometimes they get crud in there and you might have to take it apart to clean it up. You might be able to see in the second pic the rust I had to clean up.
If you need to disassemble the rod for cleaning make sure you scribe the pieces before disassemble. Also take a lot of pictures. The pieces...
Steps to follow.
1 - Disconnect batteries
2 - Remove side cover from IP
3 - Remove "Jesus" clip from fuel control rod - Do Not loose
4 - Disengage the fuel control rod
5 - Cut and remove safety wire
6 - Remove two screws and metal bridge
7 - Carefully pry out the shutoff rod - DO NOT loose the...
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