1985-50hp,Mercuy outbourd,will not open up?

[MarvinFord]

My 50 hp motor runs fine at idle speeds and up too half open. When I exceed more than half open it just pulls down. I have cleaned exhaust,rebuilt carbs,new gas tank and hose.Have had a local mercury mechanic tell me he just didnt know what the problem is. Please Help

 

[S.T. Marine]

Re: 1985-50hp,Mercuy outbourd,will not open up?

Sounds to me like you need to find a new mechanic. If he can't diganose it he needs to find a new profession. Good luck