EF3000iSEB Hard to restart

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EF3000iSEB Hard to restart

JP448
I have a Yamaha EF3000iSEB.  Customer toke it apart to rebuild the motor. I got it in a box fully apart. I built the motor put it all back together. It starts and runs. Revs up with a load on it. But ones you shout it off it will not restart. Only way I can get it to start agin is to  manually move the  throttle valve. I have replaced the  servo motor  that controls the throttle. Any ideas would be much  appreciated