It does cost to become a member. I think it's $10.95 a month. But you have access to download any manual available and they have almost all of them including the carb manual. Plus the moderators will check that forum first before coming the this one. I highly recommend it. I've got two Sea Doos and got the manual for both of them, plus the carb manual. That alone paid for my six month membership. It's up to you! On to your questions......
Low Voltage is a hot topic. And there're many causes. Bad Battery, bad connections, bad rectifier, bad magneto. First I would check your battery doing a load test. This can be done at AutoZone, Advance auto, or O'Reily. Check all of your connections.
If your screen isn't working and you don't want to fix it, I suggest PreMix your oil and gas. The last thing you want to do is run the risk of killing your engine. 40:1 is the ratio you want to mix. It's very easy to do with a oil pump block off kit available from SBT.com for $14.95, and you always know that as long as your carbs are working you're getting oil, and if your carbs aren't working your engine won't run.
For oil. You can find it on Amazon.com. Search for Sea Doo XPS. Get the Full Synthetic. It's expensive but so is an engine rebuild or a new engine. :cheers: