90 force engine only runs 10mph!!

[BLforce90]

I have a 1990 bayliner L-drive 90hp. The engine lost power to max of 10mph. I changed the cylinderhead gasket and it worked for the first day, then problem happened again w/max of 10mph. Checked compression #1-115 #2-135 #3-135. I changed the cylinderhead gasket two times. Each time I change the cylinderhead gasket it works for one day. Don't know what is going on, if anyone have suggestions please let me know. Thank you in advance.

 

[norman158]

Re: 90 force engine only runs 10mph!!

have the head checked for warpage

 

[fishthebay]

Re: 90 force engine only runs 10mph!!

I am not a complete engine guru (pistons, rings etc..) but have a good knowledge of other parts of the engine.<br /><br />Mine did the excact same thing and I traced my problem back to the carbs. I did a de-carb with the spray can type, cleaned the intake cover and exterior of the carbs and also lubed all the linkage.<br /><br />My boat topped at at 40mph yesterday, increasing my speed by 30mph. The decarb did wonders.<br /><br />Just a suggestion.