if you sprayed it down/washed it, and water got into any connections itll run shitty or not start. try disconnecting the plug and wires that comes off the stator, and back on the cdi box too. Take a compressor and blow em all out, then dab some dielectric/anti-corrosion type grease on all your plugs and connections. i had this problem, and i havent had an issue yet after greasing up the plugs n shit. hope it helps, ec.