Howard Junior Hoe wont start...help pls

 ..Hi all im new to here and thnx...for adding me...i have a junior which has new piston rings main jet and needle. ..was going great...switched it off then cant start it again..sparks seems ok..adjusted tappets again roughly as i dont have gauges...put some fuel in engine...put spark plug back on and still nothing...compression great ...can anyone help or give me ideas...im going to get another plug nxt week but is there another way to test if the spark is actually ok.thnx