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  1. https://540ratblog.wordpress.com/ I recently...

    https://540ratblog.wordpress.com/

    I recently stumbled across this blog while researching the need for zinc additives for air cooled flat tappet engines. If you search for 'Valvoline" (has to be...
  2. What voltage did you battery show right off of...

    What voltage did you battery show right off of the charger? What did it read after your ski would not start back up? Have you tried a known good battery? Bad batteries will show a good charge...
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    Carb clean and rebuild is next step. You should...

    Carb clean and rebuild is next step. You should have a mikuni sbn style carb.
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    Do a compression check and report back.

    Do a compression check and report back.
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    40 or 50 does'nt really matter on that ski it...

    40 or 50 does'nt really matter on that ski it doesn't rev high enough. Did you disconnect the factory oil pump? If the ski was stored correctly it would have fogging oil sprayed in the cylinders...
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    When your engine runs away and will not stop with...

    When your engine runs away and will not stop with the stop switch it is generally a sign that you have an air leak such as leaky crank seals or leaky intake manifold/carb gaskets. A carb rebuild...
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    You need the coupler from the midshaft of a 650...

    You need the coupler from the midshaft of a 650 lx. The midshaft on the 500 is smaller in diameter than the other yamahas from that time frame. The 650 lx was the original 500 wave runner with...
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    Unclip the cable from the nozzle(slide clip off...

    Unclip the cable from the nozzle(slide clip off of the little ball end) and move the adjuster nut to either tighten or loosen the cable length.
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    You need pull the engine to replace or install...

    You need pull the engine to replace or install the starter. If you are taking out the engine you should get new gaskets for the exhaust and not just the exhaust manifold gasket. That exhaust has a...
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    Ground goes from the battery to one of the bolts...

    Ground goes from the battery to one of the bolts on the starter.
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    Nothing hardcore about something just a few years...

    Nothing hardcore about something just a few years newer like a stone cold reliable 1993 waverunner 701 with a whopping 60 horsepower that does not handle like a 2x4 with handlebars. Still cheap in...
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    The first thing you should do is go find a...

    The first thing you should do is go find a running yamaha 500 wave runner and take it for a test drive and then test drive another ski the mid 1990s for comparison. You will find that by the mid...
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    Yes they need water for cooling. Don't run them...

    Yes they need water for cooling. Don't run them out of the water for more than 15-20 second and then you will have to let them cool off before running them again.
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    Ok I will bite. If your compression tester is...

    Ok I will bite. If your compression tester is accurate then you compression is low and your probably need a new top end. You could also check that you are building up pressure in your gas tank. I...
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    If the good carb works on the bogging ski I would...

    If the good carb works on the bogging ski I would guess that you have a leaky needle seat.
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    Did you install a new needle and seat? Check...

    Did you install a new needle and seat?

    Check pop off?
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    starter stuck

    Can you borrow a known good start/stop switch to double check your switch?

    You will find there are a few other forums that are a better source for 2 stroke info.
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    Does not sound necessarily sound like a carb...

    Does not sound necessarily sound like a carb problem unless you are too lean. If you do not have any upgrades then reset the carbs to factory specs and report back.

    I would guess that you...
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    They were a first generation yamaha watercraft...

    They were a first generation yamaha watercraft and were dinosaurs within a couple of years. In stock form they are slow and prone to cavitation. Not to mention they are relatively flat on the...
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