If true 90psi, surprised it started and suspect you have a stuck ring?
Ok here's the update. The compression tester I am using has a long hose extension, made for large (regular) sized engines. The other husqvarna dealer used my adapter to test compression with his "shorty" compression gauge and read 92psi. I went to another dealer at Rural King who had a 10mm Husqvarna compression gauge (didn't require an adapter) which read 130psi after about 4 pulls while cold.
After reading on this site, someone else pointed out that, "The Schrader valve must be as close to the combustion chamber as possible, especially on small cc engines. Be cautious if using an adaptor, it can increase combustion chamber volume and reduce the compression reading. I just experienced this on an MS171 which uses a much smaller spark plug - the adaptor changed the compression from 130 to 90 psi. I modified the adaptor to keep the valve at the end. "