Michael1973
New Member
Hello Seadoo Forum guys and gals, I sold my 97 XP a few years back but now have a 97 GSX at a good price (by Australian pricing). I Brought it not running.
The problem is it has no spark at the main plug leads. Previous owner told me this was the fault also.
What ive done so far:
The battery is fully charged and has been load tested. Its ok. The seadoo gives two beeps when the lanyard is connected and the dash gauges display normal info. Ive checked the 5 mpem fuses and 1 fuse in the rear box with multimeter after removing them, all ok. The vts functions normally also and IS connected.
Ive put a 12v test light and earthed it direct to earth lead from the battery on the engine and probed the white wire going to the coil in the rear black electrical box where the starter solenoid is. The test light DID NOT flash. I tested this with the spark plugs out while cranking over. I tested continuity from the same white wire up to the large plugs at the mpem. There IS continuity.
I removed the magneto cover (bigger job than I thought), I was hoping the trigger coil had broken its mount, it HAD NOT. The stator looks even in color visually, not burnt, no dark spots, minor metal particles (more like dust) which i will clean out before reassembly, the multimeter test on the trigger coil (yellow/white and yelllow/black) 0.242 ohms, NO continuity to the housing on either wire. The trigger coil measures the same resistance on the same wires at the large mpem plug also. The stator wires (yellow and yellow and yellow) all three have NO continuity to the housing or the black earth wire. The 3 yellow wires have 1.0 ohms between them all. The cup mounted on the flywheel appears good, with the 2 raised spots on the outside appearing normal. Still no spark or power to the white coil wire using test lamp.
The previous owner said the ski had been jump started which damaged the 5amp fuse diode in the mpem, the diode was replaced and the ski ran normally for a couple of weeks, he said the battery went flat a few weeks later, and now there is no spark. I removed the mpem, and noticed the potting/encasing compund is almost clear, you can still see small traces of the old black original compund, I also noticed that some of the clear compound is starting to lift off the circut board. I only looked at the back of the mpem. The regulator/rectifier was replaced when the mpem was repaired, it still looks new, NO corrosion around the sides.
Its seems the mpem is the last thing to check, other than the physical terminals from the large connectors into the mpem. Im handy electrically and dont mind replacing tiny electronic components, Im often replacing capacitors and voltage regulators in electronic gear.
Have I missed anything on my journey to the mpem being faulty?
Any advice on where to check on the mpem circut board and what to look at, diodes etc, hopefully something will be obviously burnt or broken. I will post pictures of the mpem if I open it up.
Apologies for the long post, but I wanted to provide as much info as I could.
I know its the cooler season in the USA, but its summer in Australia, yesterday was 42 degrees C, (107f).
Thanks, Id appreciate any advice.
Michael.
The problem is it has no spark at the main plug leads. Previous owner told me this was the fault also.
What ive done so far:
The battery is fully charged and has been load tested. Its ok. The seadoo gives two beeps when the lanyard is connected and the dash gauges display normal info. Ive checked the 5 mpem fuses and 1 fuse in the rear box with multimeter after removing them, all ok. The vts functions normally also and IS connected.
Ive put a 12v test light and earthed it direct to earth lead from the battery on the engine and probed the white wire going to the coil in the rear black electrical box where the starter solenoid is. The test light DID NOT flash. I tested this with the spark plugs out while cranking over. I tested continuity from the same white wire up to the large plugs at the mpem. There IS continuity.
I removed the magneto cover (bigger job than I thought), I was hoping the trigger coil had broken its mount, it HAD NOT. The stator looks even in color visually, not burnt, no dark spots, minor metal particles (more like dust) which i will clean out before reassembly, the multimeter test on the trigger coil (yellow/white and yelllow/black) 0.242 ohms, NO continuity to the housing on either wire. The trigger coil measures the same resistance on the same wires at the large mpem plug also. The stator wires (yellow and yellow and yellow) all three have NO continuity to the housing or the black earth wire. The 3 yellow wires have 1.0 ohms between them all. The cup mounted on the flywheel appears good, with the 2 raised spots on the outside appearing normal. Still no spark or power to the white coil wire using test lamp.
The previous owner said the ski had been jump started which damaged the 5amp fuse diode in the mpem, the diode was replaced and the ski ran normally for a couple of weeks, he said the battery went flat a few weeks later, and now there is no spark. I removed the mpem, and noticed the potting/encasing compund is almost clear, you can still see small traces of the old black original compund, I also noticed that some of the clear compound is starting to lift off the circut board. I only looked at the back of the mpem. The regulator/rectifier was replaced when the mpem was repaired, it still looks new, NO corrosion around the sides.
Its seems the mpem is the last thing to check, other than the physical terminals from the large connectors into the mpem. Im handy electrically and dont mind replacing tiny electronic components, Im often replacing capacitors and voltage regulators in electronic gear.
Have I missed anything on my journey to the mpem being faulty?
Any advice on where to check on the mpem circut board and what to look at, diodes etc, hopefully something will be obviously burnt or broken. I will post pictures of the mpem if I open it up.
Apologies for the long post, but I wanted to provide as much info as I could.
I know its the cooler season in the USA, but its summer in Australia, yesterday was 42 degrees C, (107f).
Thanks, Id appreciate any advice.
Michael.
