Hi everyone,
I'm having big trouble finding out the source of a problem that I'm having with my engine. I've got a 14ft Fletcher Arrowflyte GTO speedboat that we use for doing a bit of wakeboarding. The engine is a 1989 2-stroke Mercury 60hp, 3 cylinder outboard.
The engine is fine when out of gear and when using flush muffs on the engine but when the boat is in the water and full throttle is applied, the engine struggles to pull. The trouble is, the problem comes and goes for no apparent reason.
So far I have changed the plugs, changed the inline fuel filter, changed the primer bulb, removed and cleaned the carbs twice. Last time the problem occurred, I removed the plugs whilst out at sea and simply wiped the ends with my finger and replaced. The engine then seemed to run fine. The only difference between the 3 plugs is that cylinder 1 seems to be a little black on the white ring of the plug. They're NGK BUHW's which I've confirmed is the correct plug type.
We are also using 2 brand new plastic fuel tanks and have switched between the two which makes no difference. I have also dismantled the fuel pump which looks ok to me, nothing appears to be out of place or broken.
I'm using a 50:1 2-stroke mix and have checked that the breather vents are open on the tanks.
I've uploaded a video to youtube so that you can see exactly what's happening. Please bear in mind that the throttle is at 80% and is not being adjusted for the duration of the video.
http://www.youtube.com/watch?v=l_viou7lUeM
Please please help as this is getting really annoying and I'm on holiday at the moment and cannot use my boat!!
Thanks in advance.
I'm having big trouble finding out the source of a problem that I'm having with my engine. I've got a 14ft Fletcher Arrowflyte GTO speedboat that we use for doing a bit of wakeboarding. The engine is a 1989 2-stroke Mercury 60hp, 3 cylinder outboard.
The engine is fine when out of gear and when using flush muffs on the engine but when the boat is in the water and full throttle is applied, the engine struggles to pull. The trouble is, the problem comes and goes for no apparent reason.
So far I have changed the plugs, changed the inline fuel filter, changed the primer bulb, removed and cleaned the carbs twice. Last time the problem occurred, I removed the plugs whilst out at sea and simply wiped the ends with my finger and replaced. The engine then seemed to run fine. The only difference between the 3 plugs is that cylinder 1 seems to be a little black on the white ring of the plug. They're NGK BUHW's which I've confirmed is the correct plug type.
We are also using 2 brand new plastic fuel tanks and have switched between the two which makes no difference. I have also dismantled the fuel pump which looks ok to me, nothing appears to be out of place or broken.
I'm using a 50:1 2-stroke mix and have checked that the breather vents are open on the tanks.
I've uploaded a video to youtube so that you can see exactly what's happening. Please bear in mind that the throttle is at 80% and is not being adjusted for the duration of the video.
http://www.youtube.com/watch?v=l_viou7lUeM
Please please help as this is getting really annoying and I'm on holiday at the moment and cannot use my boat!!
Thanks in advance.
