Hello
wondering if anyone can help me,i have just rebuild my zenoah g230rc with

25.5cc race ported big bore kit
1mm stuffer crank
lighten flywheel
race ported carb

problem is it wont start,i have a spark and fuel,not sure about the settings for the race carb but tried all sorts,maybe its not sparking under compression,dont know what else to try,very grateful if anyone has any ideas