mercury 60hp wont rev past 2500rpm under load

[brad needs help]

Hello everyone any help would be great. <br />I have a Mercuy 60hp serial #OG123681, It runs perfect when it is not in gear it will rev to 5500rpm but when it is in gear it still runs smooth but it will not rev past 2500rpm. It is on a 24' pontoon boat so i know it wont go that fast but it only runs about 7MPH if anyone can help me or tell me where to start i would be verry greatfull. <br /><br />anyone in indiana fell free to come to sweetwater lake and look me up the fishing is great <br /><br />

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

i have already rebuilt the carbs and checked the fuel system it has good pressure all the time i just dont know what to do any help would be nice

 

[Bt Doctur]

Re: mercury 60hp wont rev past 2500rpm under load

check the advance linkage that goes under the flywheel to the trigger plate.had a Yam. that it was frozen and wouldnt advance. ran great no-load but in gear wouldnt do a thing

 

[Chunder06]

Re: mercury 60hp wont rev past 2500rpm under load

Hi Brad<br />Is the trailer still attached to the boat ..lol...seriously has that motor ever pushed the boat faster than 7mph or reved more than 2500 rpm, it may not have the grunt to do the job also you could try another prop.

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

I will check the linkage BT thank you<br />Well chunder i just got this house and the boat came with it, the last owner of the boat told me he used to pull a skier with it, I dont know how much you ski or if you have ever done it at all but it takes more than 7MPH to pull a person out of the water all of the people that live on the lake around me say that they have skied behind this boat and it used to go alot faster. I dont know about it reving over 2500 RPM befor but it did go about 25 - 30 MPH, the prop on here is the same one that has been on it for the past 4 years so im sure that is not it. any more ideas to help me would be nice thank you very much.

 

[tashasdaddy]

Re: mercury 60hp wont rev past 2500rpm under load

brad, what is the condition of the toons, do the have any growth on them. has the boat been in the water for the last twelve years. if so it's possible there is water in the toons. 24' is at lot of boat for a 60hp, but it should do a lot better than 7mph.

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

no the boat has been out of the water for the last 4 years so im sure there is no water in them thank you

 

[Silvertip]

Re: mercury 60hp wont rev past 2500rpm under load

Reving your engine to 5500 in neutral is not a recommended practice. Besides - an engine running on half its cylinders will still rev freely. You need to start with the basics. Compression check. Spark check on all cylinders. What did your carb rebuild consist of? If you didn't totally disassemble them, soak them in carb cleaner, clean every passage and jet and reassemble with new kits, you may need to do it again. After installing the carbs did you synchronize the timing and carb linkage (commonly referred to as link&sync)? Are you using fresh gas. Lots of basic and inexpensive things to check.

 

[DHPMARINE]

Re: mercury 60hp wont rev past 2500rpm under load

I fully agree,diagnose the motor ..... spark ... compression ... fuel sample. But water skiing behind a 24 footer with 60 HP ? ? ?<br /><br />IFDI<br /><br />DHP

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

i did a full rebuild on the carbs ano i did not check the timing but i will the gas is fresh and i am not trying to ski behind it but everyone says you can so i am just trying to get all the power back thank you so much for your input i will check the timing

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

how do you ajust the timing, it is a 94 60hp serial# og123681

 

[AMD Rules]

Re: mercury 60hp wont rev past 2500rpm under load

24ft pontoon boat, with a 60hp motor, running 25 to 30 mph and pulling a skier? Wow...

 

[brad needs help]

Re: mercury 60hp wont rev past 2500rpm under load

thats what i thought to but everyone around here tells me they have done it alot

 

[artilarygoboom]

Re: mercury 60hp wont rev past 2500rpm under load

check see if both or your carbs are opening up at the same time, thats my problem rite now

 

[Old Screwball]

Re: mercury 60hp wont rev past 2500rpm under load

Just went through the whole thread.... No one asked what prop was on the boat, and did you change it?? Shouldn't have much bigger than a 13 or 15 pitch. Lotta boat, not a lotta motor.

Good Luck

 

[444]

Re: mercury 60hp wont rev past 2500rpm under load

Did you try cleaning the carbs, doing a proper link and sync and replacing the spark plugs? I had some defective plugs one time that crapped out in a hurry.

 

[CharlieB]

Re: mercury 60hp wont rev past 2500rpm under load

Before even thinking about buying a prop, I seriously think you need a DVA meter or a DVA adaptor for a volt/ohm meter and begin checking your ignition system. A weak high speed winding will not generate sufficient energy for the motor to perform well UNDER LOAD above 2500 RPM.

HOWEVER, since there is NO RETURN on electrical parts, you cannot just assume this and order a stator without PROVING THE FAULT.