Planes off slow

[hogfoot]

I have a 2002 4 stroke 70 hp j

I have a 2002 4 stroke 70 hp johnson on a 17.5 ft center console used to come out of hole ok now wont hardley plane but once it does it runs fine rpm = 5200@ wot

 

[joereeves]

"I'm not familiar with tha

"I'm not familiar with that engine BUT with the older engines, that would result from a sticking, slowly advancing timer base..... not obtaining the proper spark advance at the given time.

Morten/JWB ?"