Home › Forum › Ask A Member › ’83 15hp, no power at top end › Re: ’83 15hp, no power at top end
I checked the exhaust side of things and didn’t find any blockages. It runs smooth at all ranges but will not go above 4200RPM.
No history on motor this was a pickup from a marina.
I am using the right test prop, and I can tell it’s not going to the high RPM it should just by sound to verify the tach is in the ballpark. This the 5th one of these I’ve worked on in the last week, there’s something wrong with this thing.
Did a link and sync and mag plate goes to full, butterfly open to full. In fact I even removed the mag plate stopper to advance it another 3/8" and all this does is make it run rich because the carb butterly starts to over rotate (even resynced with this in consideration and that does nothing to help).
I’m going to replace the powerhead completely and strap all the other components back on. I’ve got a good one from the late 80’s here. If it still behaves the same, well, that tells us it’s a component not the powerhead. If it doesn’t, that tells us the powerhead has something wrong with it.