Just bought a trx 250ex. Mod questions

Just picked up a really clean 2007 trx 250ex.

It has the popping on deceleration, so I started reading up on rejetting. At first I only plan to ad a uni filter and change the spark plug. From that what kit or jets do I need to not run lean? Change out just the main or the pilot?

What are the differences between uni filters? I see stage 1 and stage 2. Red and pink. Are they universal fit or is there a certain size I need?

Just bought a trx 250ex. Mod questions

Just picked up a really clean 2007 trx 250ex.

It has the popping on deceleration, so I started reading up on rejetting. At first I only plan to ad a uni filter and change the spark plug. From that what kit or jets do I need to not run lean? Change out just the main or the pilot?

What are the differences between uni filters? I see stage 1 and stage 2. Red and pink. Are they universal fit or is there a certain size I need?