First, the removal and installation of the keepers is best accomplished inside a gallon size zip lock bag to keep flying parts corralled.

There are two tapered keepers on each valve You push the upper spring retainer down until you can pull the keepers off the valve stem. They are just like the ones on my GM engines that I tore down in my younger days.

Here is a link to the instruction manual and near the bottom is the parts drawings. You will see the keepers illustrated there.
http://www.hobbypeople.net/media/upl...structions.pdf

Here is a close up of a valve showing the two keepers, the spring cap and the valve stem. The small end of the keepers go to the valve

http://www.hobbypeople.net/index.php...nd-keeper.html


Don