its possible it could be the filter or carb but with those numbers it could be time for a rebuild. I don't know the service limit on a blaster but I know on my uncle's polaris trailblazer (250 two stroke) the limit is 110. anything below that and its time for a fresh topend. maybe someone on here knows what the compression is suppose to be on it.

 

ok the person i bought it off of i think bored it out bigger than stock. how would u determine the size of ur piston and how would u kno what kind of piston to buy like size wise?

 

you'd have to pull the piston out and measure it or have a machine shop do it for you. your compression isn't real, real low so you might be able to get by with just a light hone of the cylinder and some new rings. check the cylinder wall for any nicks or big scratches. if its bad, then you'd have to bore it out