Hi there. I have a 1990 suzuki 85 outboard with a problem at full rpm around 5200rpm. The engine starts and runs fine then you get going at wide open throttle and runs like a dream for 5- 10 mins . Then it will drop anywhere from 500 to 1500 rpm and stay there. If i pull the throttle back to just above idle the engine sneezes a few times sparatically and comes clear again, sometimes with a vibration. If i turn the engine off and restart it the problem goes away and will run fine for anywhere from 2 - 10mins and loose rpm again.
I have already changed one coil on the number 2 cylinder earlier because then the problem first occured the engine would die but would restart straight away but apon engaging gear it would die. Also i noticed the tacho was way out and off the clock during the first lot of troubles. But when i changed the number 2 coil the problem was fixed.
Running the outboard under load on the trailer and removing the leads numbers 1 and 3 cause the engine to run rough, but when removing number 2 lead the engine note does not change, the spark does appear noticably weaker on cylinder 2 even after changing the coil.
I have checked the fuel system and it all looks ok even when the problem occurs the fuel primer is hard. And when the loss of rpm occurs sometime you do notice a vibration and when you throttle back to very little rpm the vibration is still there. Also no alarms sound during the problem occurance
I think maybe im looking at a electrical break down somewhere and it is intermittent. Maybe the black ignition box is on its way out? Any input would be greatly appresiated as it has really got me stumped. Have searched the forums and not found any othere problems similar to these. If anyone has any ideas ,diagrams or tests please feel free to post many thanks in advance.
I have already changed one coil on the number 2 cylinder earlier because then the problem first occured the engine would die but would restart straight away but apon engaging gear it would die. Also i noticed the tacho was way out and off the clock during the first lot of troubles. But when i changed the number 2 coil the problem was fixed.
Running the outboard under load on the trailer and removing the leads numbers 1 and 3 cause the engine to run rough, but when removing number 2 lead the engine note does not change, the spark does appear noticably weaker on cylinder 2 even after changing the coil.
I have checked the fuel system and it all looks ok even when the problem occurs the fuel primer is hard. And when the loss of rpm occurs sometime you do notice a vibration and when you throttle back to very little rpm the vibration is still there. Also no alarms sound during the problem occurance
I think maybe im looking at a electrical break down somewhere and it is intermittent. Maybe the black ignition box is on its way out? Any input would be greatly appresiated as it has really got me stumped. Have searched the forums and not found any othere problems similar to these. If anyone has any ideas ,diagrams or tests please feel free to post many thanks in advance.