RE: NEW ENGINE IDEA!
the crank case on my weed eater's engine has a weird shape to it and it just woouldn't be worth it anyway. i'll just use my kingmotor baja's engine til it poops and then i'll most likey get a cy 27 or a cy 29 with a headkit. (the $180 orange one from DDM)
as far as timing though on my weed eater, it's a homelite and it DOES have some serious power. i think the power can be compareable to a cy 23cc.