First thing to check is to see if the charging system is working. To do that you will charge the battery and then see if it will start. If it starts and you have a volt meter, measure the voltage accross the battery terminals. You should have over 12 volts at idle and over 13.6 volts at high speed. If you don’t get these readings, post back your readings and all your engine model numbers and we will tell you how to proceed.