one day i was riding at my friends house and i got water in the belts and they started to slip. i drained the water out of the belts and it ran fine for another day, and then it sat there for about a week and when i went over to my frineds house to get it it wouldnt start. i changed the plug and still nothing. my friend said he thinks i blew a piston, but i dont know. it sounds a little different when i push the start button, but it just wont turnover. please tell me what is wrong.