Take the head off and check the cyl bores (10 bolts on top of head, plus one under the thermostat housing). Give a light swipe around the bores with some steel wool saturated with kerosene or 2 stroke oil. Scrub/chip out any coking of the head using screwdriver/stanley knife blade/ steel wool, being careful not to damage/score head casting.
Ensure the oil lines from the tank to the pump, and from the pump to the injectors are full of oil and have no blockages or large air bubbles. Bubbles won't stop the pump from working or priming, but it will be vital seconds of pumping no oil to the crank and cylinders. The oil in the lines moves quite slowly, and any large length of air will take many engine revolutions to purge. Use a Syringe to refill the lines with fresh oil.
DON'T use Aerostart or similar to try to fire the engine unless you have already had the engine running, it will be a dry mixture that won't lubricate the cyl or crank. Squirt some 25:1 mower pre-mix into the sparkplug holes to get it to fire up.
I guess the Golden Rule is it's better to have too much oil on start-up than not enough. It will only blow smoky exhaust for a little while, which is preferable to a seized engine or scored pistons.
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