Cottage time
Recruit
- Joined
- Sep 3, 2013
- Messages
- 4
Hi; I have a 1987 DT 55 2 stroke triple, old but reliable. Starts fairly well, idles well enough for the year, runs okay at wide open throttle, issue appears at mid throttle say 1/2 -3/4 open, motor surges (speeds up then slows down) it feels like either air or fuel starvation. pretty cyclic in nature. In the garbage can with the muff on doesn't due it with the fast idle seems to be when under load.
I have tried to adjust the carb pilot air scres but doesn't smooth it out, might lessen the effect but still there. I have replaced the primer bulb, no viable cracks or kinks in the air lines, vents on tanks are open (been caught on that recently) I still have to check the pickup line inside the tank and needle valve on tank for leaks.
Question; Can this be an indicaiton of the fuel pump diaphram wearing out? I have also replaced the fuel filter.
I have tried to adjust the carb pilot air scres but doesn't smooth it out, might lessen the effect but still there. I have replaced the primer bulb, no viable cracks or kinks in the air lines, vents on tanks are open (been caught on that recently) I still have to check the pickup line inside the tank and needle valve on tank for leaks.
Question; Can this be an indicaiton of the fuel pump diaphram wearing out? I have also replaced the fuel filter.