Is that the 32cc half crank motor?
If so it should also be a 4 port.
Your in the wrong country for me to help you out, I have an air cooled one here that I reported and modded for an airboat,lightened flywheel etc.
Read through the tech. articles lot of good info to get you started.
port timing & squish
I am running the same mcculluch 32cc half crank in my El cheepo Hull.
Would be good to know if there are any simple mods that can be done.
Mine is still stock, but runs great.