Quote: Originally Posted by
surfnplay12 
How hard is it to change the springs with the head still on.
It's a bit more difficult Once you remove the valve locks/retainer, the valve will just drop.
some old school guys would just stick nylon rope in the combustion chamber through the spark plug hole (leave some rope sticking out of the hole so that you can pull it out) and then move the cylinder up close to tdc.
Ive heard of compressing the cylinder with air to keep the valves closed, but I don't know how well that works in practice.