Merc 90 4 stroke bogging out at about 4000 rpm

[avius]

Hey guys, back again with new trouble . About 3 months ago I rebuilt the carbs and all seemed to be well. Idle was good, and I could WOT the motor with no bogging. The motor sat for a couple months while I worked on the rest of my boat. Now that the boat is ready for water I am unable to get the motor past 4000 without it dying..... Idles fine. Could the carbs have gummed up that quickly? Do I need to rebuild them AGAIN?

Unrelated to that problem, I am having what I believe to be a "Lean Pop" on my other Merc 90. Fortunately that is the only problem with that motor.

Anyone know how to resolve either issue? Advice it GREATLY appreciated.

 

[jake505]

Re: Merc 90 4 stroke bogging out at about 4000 rpm

yeah it is possible for it to get gummed up if it sat even for just a couple months you shouldn't need to rebuild them again just clean them out you could always try putting some Sea Foam in it I have heard good things about that but never really tried it but its supposed to clean carb jet and all kinds of other stuff. sure would be a lot easier than tearing your carbs apart I have seen it at parts stores but never tried it but some people swear by it and use it in everything.

 

[avius]

Re: Merc 90 4 stroke bogging out at about 4000 rpm

Thanks for the tip Jake. I had already torn them apart and thoroughly cleaned them by the time I read your reply. I'll keep that tip in mind for the next time my carbs arent working proper. For now though they are back to normal. Just needed a good cleaning.