I am new to jet skis and new to this forum. I have a 1999 GTX LTD the top end of the motor had been rebuilt and the new pistons are +1.5. The motor had been broken in since rebuild but not run. Initially it will start and run fine but after a few minutes it will stall, but restart right away. Eventually it wont start. I had the battery on trickle charger prior to the run and measured 12.87 V before putting it in the water. After I got it back on the trailer the better had 12.38 V. Based on things in this forum, I assume it's the Stator or something in the MPEM. Looking for some diagnostic advice and any thoughts. Thank you.