1986 mariner inline 6 90 hp

[FatCapt.]

just had motor serviced, mechanic said it was idling too high so he turned it down. now after motor warms up it stalls and spits. i realize that when an outboard heats up it also leans out. i have since adjusted the idle up will this fix the problem?

 

[1nebel0]

Re: 1986 mariner inline 6 90 hp

Be sure and turn the idle timimg screw to adjust the speed..if you turn up the stop screw you will be opening the butterflies and it won't start...

 

[FatCapt.]

Re: 1986 mariner inline 6 90 hp

i also have a problem starting-ihave to hold WOTand choke to start.

 

[Chris1956]

Re: 1986 mariner inline 6 90 hp

It sounds like you should do a link and synch on that motor. I suspect your mechanic is too young to have experience on your motor. A service manual is the way to go.

 

[Jlawsen]

Re: 1986 mariner inline 6 90 hp

It sounds like you should do a link and synch on that motor. I suspect your mechanic is too young to have experience on your motor. A service manual is the way to go.

I agree with this theory. I recently had a 85' 90hp motor come to me that had been to several well known shops in the area. By the time I got it, it was so whacked out by guess work that there was no way it was going to run. It took me all of about 15 mins to find a bad cylinder and a broken reed. They all missed the obvious because they didn't know older Merc's.

 

[celdred]

Re: 1986 mariner inline 6 90 hp

Can you tell me how you diagnosed a cracked reed? I have a new to me Merc. 90hp inline 6 I'm trying to diagnose a rough/no low idle on. Thanks!

 

[Dave1027]

Re: 1986 mariner inline 6 90 hp

Be careful Celdred. Many technically inexperienced outboard owners like to jump to suspecting reeds when there almost always another reason for their problem like fuel/spark.

 

[Chris1956]

Re: 1986 mariner inline 6 90 hp

Celdred, Stock reeds almost never fail on those motors. Rough idle happens a lot. Are the carbs clean? Is the idle pickup timing set properly? Are the carbs idle mixtures set properly? Odds are it is not the reeds....