i bought this yfz450 last year summer. and it plm with charge system like it kept charge it up everytime i use, i put it in shop and they rebuild my top end head value, put the aftermarket hi-comp 13.1.0 wristpin piston and i set the timing it would turning but wouldn't start the engine. i bought the brand new battery and it dead in short time. any feedback? i check the ign system it did shock me out. the battery i bought from apex and it said it make in japen? i think my new battery's sucks?