motorised

hi folks here is my 66 cc 8 speed chopper i built many years ago, it still runing fine, has upgraded bearings ports done, expansion chamber hyd disc front and rear. the link is ‪chopper bicycle, chopper bike, 80cc chopper push bike,‬‏ - YouTube, enjoy this is how i build em in australia...

hey guys, my bike wont start :( its brand new and ive used it a few times, but it hasnt started since my 2nd ride. any tips on what it could be?