my cpi motorcross has been to the garage twice so far because it refuses to start, the first time it went in they cut the silencer in half to get rid of a blockage and day after I got it back it still would´nt start, the next time in went in they changed the float valve in the carb, next day again in refused to start again, I had a look at it and found a loose wire connector attached to the carb so tightened it up and after a few kicks it started, it went fine for 3 weeks but now it won´t start again, would be grateful if anybody could give me some advice as i´m stuck for what to do next.