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Old 07-18-2012, 09:24 PM   #1 (permalink)
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Join Date: Sep 2011
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Default js650sx has no power?

My 650sx runs like shit and has had mechanic stumped for months. It use to have a 44 mikuni carb on it and would run well but wouldnt idle. The mechanics convinced me that the only way to get it to idle would to be to put the stock carb back on it (huge mistake). Now the ski runs even worse. Now all it will do is idle and when you try to get going on it the ski boggs down almost instantly and eventually dies. The engine is new so I wouldnt think it could be an internal issue. Now the mechanics say that this is because of the igniter and say I need a new one of those. Does this make sense?

I've been screwed out of $800 in mechanic fees and have no improvement to show for it so far. I am pretty skilled mechanically, but new to jet skis, and just need to be pointed in the right direction. Anyone have any advice or suggestions for me?

Any help is appreciated, thanks
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Old 11-11-2012, 08:10 PM   #2 (permalink)
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Join Date: Oct 2012
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Default js650sx has no power

Is this a 2 stroke engine? I am also new to skis but was a motorcycle mech. If the carb you had on it would not idle it sounds like you had an intake leak i.e. hose or bad gasket or the wrong gasket. There should be a couple of small holes in the intake, reed valve flange and if the wrong gasket was used without the matching holes it will not run right. If there is no power or when you throttle up from idle it could be a bad spark plug. As the RPM increases in a 2 stroke so does the pressure, a bad plug will quit sparking under a higher pressure.
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