Got a 2000 blaster. When I got it it didn't have an air filter. It would start but the idle would scream. I put an air filter on it and it will not start at all now. Any ideas?

 

If it was ran without an air filter, I would do a compression test before doing anything else.

 

It will run if it has : 1. (fuel) check plug and see if it is wet 2. (spark) get a inline spark tester and kick the bike over and see if it lights up 3. (compression) kick it over slowly does it build good pressure? when I buy a bike I usually drain the fuel clean the carb and change the plug. I change the fuel line if it looks like it needs it. If I had to guess I would say your carb is gummed up.