1987 115 hp mercury surges at 1600 rpms

[Rick12]

I have a 1987 115 hp merc. at 1600 rpms it starts surging like it might be fuel starved if i back off the throttle and try again sometimes it will take off and run good any help would be appreciated
thanks
Rick

 

[sparky4612]

Re: 1987 115 hp mercury surges at 1600 rpms

I have a 1984 inline 6 115 and am having the same problem. I was told it is probably the fuel pump or maybe a link and sync issue. I ordered the rebuild kit for the fuel pump and plan on fixing it myself next week. It looks real easy. The one way to trouble shoot a pump issue is to have someone squeeze the primer bulb when you experience the surging problem. If this helps it is the fuel pump. I have the manual and can copy the instructions and diagrams for your motor if you like. Rebuild kits cost $10. The link and sync issue might be more than I care to handle but if rebuilding the pump doesn't work I may have to.

 

[Rick12]

Re: 1987 115 hp mercury surges at 1600 rpms

I have tried sqeezing the primer ball and it did not help I think i am going to check the fuel lines air leaks and if I don't find anything there i am going to take it into the shop thanks for your help and I will let you know what I find out

 

[Rick12]

Re: 1987 115 hp mercury surges at 1600 rpms

talked to a mechanic and he said to mix 2 cans of seafoam with the gas and change the spark plugs I will see if this works this weekend

 

[BatDaddy1887]

Re: 1987 115 hp mercury surges at 1600 rpms

My '88 Merc 115 inline 6 did that until I had the carbs rebuilt. My friend and I did the first rebuild but we had a bit of the same problem. Then I had an outboard mechanic rebuild the carbs and he said he had to use the fine wire from an unwrapped cable to clean out the small jets inside the carbs. Ran perfect after that.