I recently bought a Timberwolf 6" 35hp deisel. It was built in 2000, might have been Entec. On some stuff it fills up with chips and gets blocked. In particular, it happens with leylandii (especially the green bits rather than logs) and elder logs. It cuts ok but doesn't seem to blow the chips out. From what I can see, everything that should be on the flywheel is present and correct. Any ideas?