problema evinrude 70hp

[TONI_SHEILA]

hola a todos, tengo un evinrude 70 y un 55 hp y los dos motores presentan el mismo problema: hacen falsas explosiones y no se de donde viene el problema.
el 70hp funciona correcto a altas revoluciones pero no en relentí y el 55hp siempre explosiona mal.
gracias por adelantado: Confused:

[boats.net]

Run a compression test to see if even, With a timing light check that all cylinders are firing at time engine is running bad, check timing on each cylinder to see if firing at correct time. If engine is running too lean it will backfire at low speed, may need to remove and clean carbs, look for bad gaskets on intake manifold causing an air leak.