96 artic cat zr580 efi sled wont run

I have a 96 artic cat zr580 im stumped as to what is ailing my sled it gets spark gets gas has awesome compression it acts like it wants to start but its just not takin hold i ran the sled for about 25mins the first time then it just died locked the pistons up so i managed to get them freed after about 20pulls with the throttle half open it finally kicked over an ran fine got it bk to my shop pulled it in an did some routine stuff to it later that evening i went out an pulled it once started rite up this time ran for 10 mins around my yard an did the same crap just died but it didnt lock up i spent a good 2hrs pulling on it blowin out the cylinders changed plugs an nothin acts like it wants to start but just wont get up an go someone told me to check my efi box for blinkage so i did there was no red light no blinkys of any kind is there not power goin to the efi box battery is brand new i just put in new wesco forged pistons an rings new ngk plugs its getting plenty of gas an oil mixture so im stumped on what the deal is an suggestions be great rite now

96 artic cat zr580 efi sled wont run