View Full Version : Loss of RPM on 1983 Force 85 HP

02-29-2004, 05:07 PM
"My 1983 force 85 Horse has dropped 1/2 R.P.M.s at W.O.T. (4000 to 2500). This started after trolling and running out of gas. After refill, the engine started fine but refused to run at 4000 even though the throttle plates are wide open. So far I have decarbed the engine; checked the compression (125 on all cylinders), replaced the fuel pumps 3 check valves, gaskets and diaphram along with new gas lines and a new prime bulb. The Carbs have also been cleaned. At idle I can remove the number 1 plug wire and the engine will keep running at reduced R.P.M.s. When taking number 2 or 3 plug wires off, the engine dies. Any help really appreciated. [email protected] ("")"

02-29-2004, 05:41 PM
Did you check the spark?

02-29-2004, 09:32 PM
" Tom, Thanks for the response. Yes I have checked the spark and found strong blue spark on each cylinder. "

03-01-2004, 08:37 AM
" If spark and compression are good, that should leave a fuel problem. I'd check that top carb again. "

03-01-2004, 10:23 AM
Thanks again for the input. I will definately check the carb again. Will not be able to check it until the weekend.