Ditto, you should at least check the ignition timing. If it is even a little bit too advanced, bad things happen. Aftermarket triggers may not have the same tolerances as OEM, and adjustments may be necessary.
I used an automotive timing light, run it on muffs with the fuel line unhooked until the carbs are empty, pull the plugs, ground them. Hook the pickup onto the #1 plug wire, move the throttle control to wide open, and rig up a jumper wire to crank the motor by the starter solenoid.
If your motor has a moveable timing pointer, you should verify TDC with a screwdriver prior to adjusting, and it helps to apply a piece of white tape or white out on the timing mark to make it more visible.
There should be a decal on the airbox that shows the maximum timing numbers. On my 84 Merc 60hp it is 29*BTDC, I set it at 28 just to be conservative. The timing numbers in my Clymer manual were totally wrong.
