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I hope you guys can help me. My boat sat longer than it should have, I went to run it and sure enough, it was bogging down, sputtering and just not running right, I drained the fuel, changed the water separator, fuel filter element, I removed the VST and cleaned it replaced the filter and installed new fuel injectors. I took it out for a test run and she ran like champ. I ran back and forth on the canal and after running for a half hour it just all of a sudden went into a limp mode like stage. It wasn't sputtering like before but it wouldn't rev up past 3900rpm. Any ideas? Thanks in advance!!
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Yamaha does not use the term "limp mode",
but there are several conditions which will limit rpm.
Low oil pressure, or overheat, will cause misfiring to limit rpms to ~2,000 -
but along with that will be the audible alarm and the warning indicator on the tach.
That model may - I'm not certain if it does or doesn't -
have an rpm limit when in neutral;
it does have a shift position switch -
you could check that it is working.
You can determine if it is a fuel problem or not
by putting a pressure gauge on the fuel rail
(there is a Schrader connector there for that purpose)
see whether or not you have the required ~40 psi on the rail
when it starts to crap out at 3900 rpm
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