I'm having trouble getting my sportsman started, I put on a new starter and a new starter solenoid and still isn't starting. Battery is fully charged and I only hear clicking noise from solenoid.

 

Battery sounds like the main suspect or you may have a bad ground connection. Batteries can show fully charged(12.5-12.8 volts) but still can fail a load test.You can have it load tested at an auto store or check it out yourself as shown in this article.https://www.batterystuff.com/blog/ho...ry-is-bad.html