1988 merc inline 6

[lovesboating]

HI,
I have a 115 inline 6 1988 and having problems with the RPM's at top end.
anything over 4000 rpms it wants to start missing, what I need to know is why?
I use 91 0r better gas and quicksilver 2 stoke oil, new plugs new fuel pump and rebuilt the carbs, what else do I need to do, starts up and idle's good.


lovesboating

 

[Faztbullet]

Re: 1988 merc inline 6

Is it missing or loosing power? If missing try disconnecting rectifier annd see if problem goes away..

 

[Chris1956]

Re: 1988 merc inline 6

Have you cleaned all the fuel filters, strainers and screens? That motor may have backdrag carbs. Some of these carbs have a fuel screen under the brass fittings in the carb covers. Sometimes that get clogged.

 

[Texasmark]

Re: 1988 merc inline 6

I had one (exact engine) that I could run out of gas. I ran 6k rpm when I was trimmed out properly and after a short time of running like that, the engine just slowed down.

In short, after chasing several ghosts (the normal things you would suspect), I rerouted my fuel line and solved the problem.

Mark

 

[lovesboating]

Re: 1988 merc inline 6

I replaced all the fuel lines, no matter how it trimmed it starts breaking up at about 4500 rpms