Outboard Motor Help

[Live2fish85]

I am just looking for some help on figure what is wrong with my motor we have older Merc from the early 90's, it is a 70 hrsp.

 

All of a sudden the motor has started to run really high rpms. In neutral you would think the throttle is at full and while in forward and reverse it is the same. In forward it it going probably 8kmh at the slowest you can.

 

Any ideas what may cause this?

 

Thanks

[UglyBug]

Sounds like the throttle linkage is stuck somewhere and its not letting the carbs return to there idle location. Check to see if the throttle has any restrictions preventing it from returning to the idle postion.

[Live2fish85]

Thanks uglybug. I forgot to mention, we did replace the throttle wire and alot that thinking that is what it was.

[UglyBug]

Should be an easy fix. I had a 30 Johnson a few years back that did the same thing, If i recall the linkage was binding against the housing when I put the cowling on.

[krixxer]

"started to run really high rpms"

 

- lean conditions, check fuel hoses for cracks

[Live2fish85]

Thanks Krixxer I will check those out as well.