My bike wont start. after changing the cracked and brittle fuel line my bike will not start up again it just turns over but doesnt catch and start. details: i had trouble getting some fuel hose and the bike was left over night with the tank off and fuel line open. could moisture have gotten in? enough to stop it starting? while the tank was off my dad decided to clean my carbs for me, but im pretty sure all he did was take the caps off and spray cleaner inside. he also hosed the engine a bit cause it had grime all over it and accidentally wet the spark plugs. when they dried still no start so i replaced them. still no go... i have also drained the carbs and some murky stuff came out of one but then went clean, the other only dropped clean petrol. ive also pulled the carbs apart twice to check that dad put them back right and he did... the first time i check they were clean as a whistle (from the top) but the second time there was a bit of paint flakes and crud settled in the nooks and crannys in there... so my next step will be to pull the carbs out (never done it before) and clean them unless somebody knows something else that i can try. i would take it to a mech but it will be a pain in the ass to get it there. thats all the details i can think of right now... oh, it also back fired once while trying to start nearly gave my dog a heart attack, but that means it is getting fuel doesnt it? maybe too much? i dunno lol if anyone could help me out i would apreciate it so much thanks guys.