Re: 25 HP Evinrude timing
If the engine is 'kicking back' when starting, it is often due to a double firing power pack.
Either attach both plug wires to a spark tester or pull the plugs and ground them.
Pull the starter cord and notice the spark sequence.
They should fire 1-2-1-2-1-2-...
If you notice that they are fire both on the same time,(1,2-2-1,2-2-..) change the powerpack!
The only timing to adjust is the max timing.