my 25 hp evinrude is having trouble starting... the starter turns the fly wheel just fine and when it does spark its a hot blue spark but the spark is not consistent... i have tried both plugs and i get the same results, it only sparks every once in awhile... At first i had a bad kill switch that wouldnt allow the starter to spin the flywheel but i by passed it and found it was bad so i replaced it... but now i cant get it to spark every time... im new to boat engines and wanted some suggestion before i start taking things apart... any help will be appreciated