2000rpm

[longnkrnch]

I took my boat out this weekend. It is a bass boat with 100 Mariner.
It ran fine at first, I went across the lake and fished a little. Then I cranked it up and was going to another spot, but the motor would not pull past 2000 RPM. It starts, idles and runs great UP TO 2000RPM, but will not pull past that. Not even enough to get up on plane.
Anyone got any ideas?????
Thanks

[mnydvr]

if this is a recent problem or one that is new to the season,try a tune-up first,plugs , filters,ect... if that don't work , go to the fuel system, is it pulling steady fuel? is the ball in the line staying hard? to check it ,have some one squeeze it while you are running and if it is soft , have them pump it up and see if it makes a difference,after that you need to go to the ignition system,are all the coils firing at high rpm?these are just a few things that a shop will check first that may save you some time and money,but if your not sure of what you are doing ,I can tell you as an experienced mechanic,it may be better to have it checked out because outboards can be very tricky and leaning a carb or offsetting the timing can cost you a powerhead and you DONT want that!! let me know!

[CB]

Since it ran fine at first going across the lake, it sounds like you might have water if this is the first time you used it all season.

[mnydvr]

I agree,it could be water but the only problem there is the start and idle,which he stse are fine,would'nt water cause a start and idle problem?

[longnkrnch]

Yes, it starts perfectly and idles perfectly. It pulls up to 2000rpm and then just won't go any further.
What do you think about a clogged fuel filter?

[longnkrnch]

when you say could be water, do you mean water in the fuel.
I had just filled it up prior to going to the lake with it.

[mnydvr]

I would start there,dump the tank,run it on a seperate remote tank with the proper mix ,change the plugs,change the filters and try it that way,I think that'll do it.

[longnkrnch]

Turned out to be the switch box. It was only running on two cylinders.