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  1. #1

    wetjet 300 problems

    Last year I bought two Mastercraft Wetjets (with Yamaha 701 engines in them) that had been sitting in a garage for 8yrs. I changed the fuel and put new batteries on them and they started up and ran great. After going to he lake 5 or 6 times one of them got to where it would die when running WOT. It would start right back up and idle fine. If you let it sit for a few minutes it would run good for a little while and start doing it again. After a few more times at the lake the other one started doing the exact same thing. I stored them for the winter and early spring I took them to a so-called mech. he cleaned the carbs and fuel tank and said they were fine now. The first time I took them to the lake, same thing. I changed all the fuel lines, put new fuel filters on them, and had a friend help me put a carb kit in one of them. Took it to the lake; no better. When you go to the lake they both run great for the first 15 mins. or so. I don't think they are getting hot. I can hold my hand on the exhaust manifold.

  2. #2
    Lean seizing?

  3. #3
    Sound like it lean.

  4. #4
    Myself's Avatar
    Join Date
    May 2007
    North Central Arkansas
    Bad fuel tank check valve or exhaust leak in the hull could cause it.

  5. #5
    My yamaha wave venture was doing that. It would run great. All the way up to mid range. Then it would flat die .It ended up being the cdi.

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