I recently met a Seadoo tech that has been in the business for years. We were talking about my skis (03 rxdi) and he told me to make sure the "check valve" in the oil filler neck was present or the engine would blow up. I know that one of my skis has this in place and the other one has broke off and is laying inside the oil tank. There are 2 lines that come off the injection system and go to the filler neck, I just figured they were vents. We ran it all summer last year and they have been doing fine. Anyone know about this issue? Is it really a problem. There is a nipple off the filler neck and the little check valve lays inside the oil fill pipe. Thanks for any insite on this issue.