Hi,
I have a problem with my 1994 Mercury 50 hp 2 stroke outboard. When running in gear at or below 1/2 throttle it is fine but when more throttle is used (up to WOT) it runs well for 30 seconds or so then dies off a fair bit. At this stage it runs as if it were at 1/2 throttle. Every now and then it will pick up momentarily then back to slow again. It seems to do this more in rough water.
I have so far tried: Cleaned out fuel tank; Replaced split pick up tube in fuel tank; Removed the fuel filter and used primer bulb to flush clean fuel through the lines and fuel pump; Placed a new fuel filter; Drained fuel from carby's by the mixture adjustment screw cover plugs; Pumped primer bulb with engine running in said condition (bulb was firm before pumping); Compression test (125psi in all cylinders when warm); Checked spark plugs (clean with a light film of carburised oil and sqare shoulders on electrodes).
The oil injection (pre fuel pump mixing type) was disabled and I have been running 50:1 premix for quite some time.
Has anyone out there solved a similar problem or got knowledge of such problems? Your help is greatly appreciated. Thanks.
Brian.
I have a problem with my 1994 Mercury 50 hp 2 stroke outboard. When running in gear at or below 1/2 throttle it is fine but when more throttle is used (up to WOT) it runs well for 30 seconds or so then dies off a fair bit. At this stage it runs as if it were at 1/2 throttle. Every now and then it will pick up momentarily then back to slow again. It seems to do this more in rough water.
I have so far tried: Cleaned out fuel tank; Replaced split pick up tube in fuel tank; Removed the fuel filter and used primer bulb to flush clean fuel through the lines and fuel pump; Placed a new fuel filter; Drained fuel from carby's by the mixture adjustment screw cover plugs; Pumped primer bulb with engine running in said condition (bulb was firm before pumping); Compression test (125psi in all cylinders when warm); Checked spark plugs (clean with a light film of carburised oil and sqare shoulders on electrodes).
The oil injection (pre fuel pump mixing type) was disabled and I have been running 50:1 premix for quite some time.
Has anyone out there solved a similar problem or got knowledge of such problems? Your help is greatly appreciated. Thanks.
Brian.
Last edited: