HELP!! ENGINE NOT STARTING, BACK FIRING, WHEN RUNS ENGINE WONT GO MORE THAN 3,500 rpm

[Nightster727]

Hello, I need help. A month an half ago I rebuilt the carbs myself, I'm very mechanical oriented but is the first time I worked on seadoo engines. The boat ran good for 1/2 hour then one of the engines stall and did not want to start again. I took it home and replaced the heat sensor since the one on that engine I discovered was broken, I also replace the spark plugs and after a while got it going. Following week, took it to the river and ran good for 15 min, then engine stall again. I was able to fired it again but revs didn't go higher than 3500 rpms. When I try to start it yesterday it won't start and the mpem is beeping after awhile trying, I took the key out and put it back in an try again until start beeping again but not after a while of trying. Is it carbs? Voltage rectifier? The whole mpem? Forgot to mention that the other engine runs like a champ.

 

[Coastiejoe]

The advantage of having two engine is, you can swap items from a known good running engine. One thing I would do is check the voltage out put as well as do a load test on the battery. I expect it NOT to be the battery as the other engine starts. But it is a good thing to know. It could be the rectifier but that normally does not affect the starting concern you are having. It does affect higher end or loaded engine RPMs.

 

[Nightster727]

The advantage of having two engine is, you can swap items from a known good running engine. One thing I would do is check the voltage out put as well as do a load test on the battery. I expect it NOT to be the battery as the other engine starts. But it is a good thing to know. It could be the rectifier but that normally does not affect the starting concern you are having. It does affect higher end or loaded engine RPMs.

Yeah, I will get the carbs off the other engine and swap with the bad engine and also rectifier.
I will let you know what I found.
Thanks