Husqvarna 2009 TE 310 Workshop Manual page 103

ENGINE DISASSEMBLY
Using a tweezer, remove the valve adjusting pads.
Use a valve spring compressor tool to remove the valves. Be careful not to
damage the gasket surfaces or the combustion chamber.
Make sure that the valve spring compressor is always straight, otherwise the
valve stem can bend.
To prevent loss of tension, do not compress the valve springs more than
necessary. Mark all parts, so that they can be reassembled correctly.
If the valve cotters have made a burr on the valve stem, remove it before removing
the valve.
Remove the sealing gaskets from the valve guides.
Remember to replace the gaskets with new ones when reassembling.
Part. N. 8000 H0368 (09-2008) F.9