I have a 1998 SPX 787 and it runs fine on the trailer and we put it in the water and it has trouble starting and bogs out after about 10-30 minutes then loses spark. We’ve replaced many parts including the coil, fuel lines and filter, as well as putting in brand new mikuni carburetors. We also replaced the cdi with a new aftermarket one. We checked many components like the stator and was fine. After all that it still didn’t run right. I know it’s only February and too early to talk about jet skis but I want to be prepared as we messed with it all summer last year. If anyone has the answer I really appreciate it. Thanks in advance.
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Spx runs on trailer but bogs after 10 minutes in water
- Thread starter SPXblake
- Start date
I didn’t check compression but I know we have a good voltage regulator
moayad.jaffar
New Member
I had the same issue with my XP limited 99.
The Negative cable from the battery to the body of the engine was corroded. I had to replace it.
Once you have corrosion on the Main Negative cables means the ECU will not send sparks to the spark plug because the ECU will recieve less than 12v and full Amps needed for the ECU to work properly.
The Negative cable from the battery to the body of the engine was corroded. I had to replace it.
Once you have corrosion on the Main Negative cables means the ECU will not send sparks to the spark plug because the ECU will recieve less than 12v and full Amps needed for the ECU to work properly.
Hmm I’ll have to check on that
Grim
Well-Known Member
I'm not saying your are wrong, but did you meter check the regulator? Most of the aftermarket electronics for our skis are junk, a friendly comment to double check it. If you can get OEM too, OSD is good as well, still verify though. They tend to be much better.
As Moayad said grounds are a big problem as well. I typically remove inspect, test and reinstall to verify a good ground.
Venturian1
Member
If you connect a timing light you can monitor the spark. A volt meter on the battery will tell you if the voltage regulator/rectifier is doing its job. Watch for fluctuations. check the mpem and holder relay if it has one
