95 Force 90 no power

[Robert459]

Just bought my first boat with an out board. I am stumped!! Its a 1995 Mercury Force 90

Boat had sat for two years. Was running when I bought it. Took it out ran poorly. Low power. Idled fine. Drained every drop of fuel. Cleaned the Carburetors. Replaced plugs. Replaced fuel filter. Did a compression check 120 on each cylinder. Engine will not rev past 3500rpm in forward. Seems to rev okay in reverse. Thanks Bob

 

[Redbarron%%]

Make sure that all of the cylinders are firing. I use an induction timing light to check, If it flashes then at least there is a surge of current going through the wires. I had a similar problem with a bad trigger coil dropping out at higher rpm.

 

[The Force power]

In addition;

Check fuel-pump/lines & tank for venting

 

[jerryjerry05]

When you "cleaned the carbs" did you make sure the jets were open, run a tip cleaner through them?
Check the fuel pumps diaphragm?