Yamaha 70 cutts out

[Alecmorison]

Yamaha 70 4stroke
Engine just dies when you his 3500 rpm to 4000rpm
Motor Will run fine bellow and above. When engine dies put back in neutral and starts first time.
I have replaced fuel lines, fuel filters and water sensor.Also replaced the fuel pump.

 

[R_P]

What battery are you using? If my light LiFePO4 battery gets low it will do the same thing. Heavy lead acid battery no problems