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My onboard oil tank has been overflowing for 2 years. Engine has been serviced by official Yamaha center twice for this problem. Both time they replaced the float and said unit tests good. I have personally replaced the float once and the ECU twice. I have tested the unit carefully and at first it seems to function properly. But actually what happens is each time the engine is started the sub pump runs for a short time regardless of oil level in the onboard tank. So with repeated start stop like when we are skiing, the onboard tank overflows and makes a mess. (We have since added overflow tubes so we don't pollute) After more than $1000 dollars spent we have no solution. This is an 'upgraded' ECU. The wiring is somewhat different and need to run a cable (supplied with ECU kit) to a terminal on the CDI. Does anyone else have this problem and is there a solution? Thanks for your help.
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Replacing Oil Control module with new style should resolve problem, 6E5-WS857-00-00 Oil Module Kit -
Thanks for getting back so soon. I have put the upgraded control unit in twice. Once in 2010 and just reciently I replaced both the control unit and Oil level sensor.
10-6E5-85730-12-00 : OIL LEVEL SENSOR 4/25/2012 1 0 1 178.75
10-6E5-85740-02-00 : SS BY - 10-6E5-WS857-00-00 - CONTROL UNIT KIT 0 0 0 213.66
(Superseded by 10-6E5-WS857-00-00 with QTY 1)Comment
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Check wiring connectors and recheck wire from new style oil module to CDI box is wired correctly, check all ground wire connections are clean and tight.Comment
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Did you ever figure out how to fix it I'm having the same problem
Did you ever figure out how to fix it I'm having the same problemOriginally posted by mark_us11 View PostComment
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Engine mounted oil tank strainer orientation - please check.Comment
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What might be the model for your particular Yamaha motor?Originally posted by Thomas777 View Post
Not all Yamaha motors are created equally.
A 1984 25 HP is one thing. A 2007 VZ300 is something altogether different. I suspect your model is somewhere between the two.Comment
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