I was just wondering if anyone can tell me if the voltage reading on a voltmeter should fluctuate at the battery when at idle on a Seadoo GTX DI (2001). Mine jumps around all over the place between 1.7 and 13 volts. I have about 5 hours of running on a SES rebuilt engine and from the start have been experiencing an engine missing issue. RPM goes to about 6500 RPM. Speed unknown due to no working speedometer. I am thinking of replacing the voltage regulator/rectifier as they are not too expensive. Does this sound like the right approach?
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Fluctuating battery voltage at idle on 2001 Seadoo GTX DI
- Thread starter Trevman
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Well I got the rectifier in only two days and installed it but the voltage readings are still the same fluctuating between almost 0 voltage to about 13V when the engine runs at idle speed. I don't get it. A voltage regulator seemed like it would be the culprit. The magneto must be producing voltage because my battery hasn't dropped from 12.4 volts and I must have started it up at least 20 times since I started running the new engine. I guess it is possible the replacement voltage regulator/rectifier is bad too or maybe it's another issue? Is this actually what might be causing my engine missing and weird throttle response? There is a range of throttle between say, 1/2 and 3/4 where nothing much happens to the speed until the RAVEs kick in. Has anyone dealt with this before?
GGuillot
Well-Known Member
Someone else recently on another forum was chasing this same issue, it ended up being non resistor spark plugs messing with the voltage. Just like your issue, the meter wasn't steady at the battery, which it should be. I'd just check, especially since you just got the engine back from SES.
I'm pretty sure the voltmeter is good. I use it all the time and no issues. It only misses at certain RPM. At idle, it is fine. SES sets the timing with their rebuilds, I wonder if a slight timing misadjustment would cause the missing
Thanks for the suggestion but I have the OEM reccomended plugs in it with properly set gap. The plugs got pretty fouled after the first couple of running hours but this was due to the extra oil SES puts in the bottom end for initial start-up. I changed the plugs and after running for another 1.5 hours, the plugs look like they are still brand new which worries me a bit since I was expecting to see a slight brown color.
I was wondering about the cleanliness of the injectors too. After the first few hours of running with the rebuilt engine, the plugs were black so I changed them. Now after running for about another hour, the plugs are almost completely white still. Maybe it just hasn't run long enough for them to turn brown. I will run some more. Can a person clean the injectors or do they need to be sent out? I saw a video of someone cleaning car fuel injectors with carb cleaner while energizing the injector but the manual says not to use cleaners - only a wire brush to clean. Have you tried cleaning Seadoo injectors?
After you mentioned it might be running lean I rigged up a pressure gage to test the fuel pump and it is right on spec with 27psi with lanyard attached and 107 psi when running. Maybe the injectors are dirty. I have no idea of their condition as I just bought the unit.
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