We can pull them out and check the spray, throwing money at it isn't always the best way. I meant the fuel filter, Your plugs aren't wet so a clogged air filter wasn't it. They actually look a little lean.
Tone You can spend Your money anyway You want, but if I'm right it will cost You very little and I think re-gearing would be more beneficial for You. I won't say anymore, it's up to You.