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Old 15 April 2020, 12:21   #1
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2 stroke 75hp mercury

Got an early 90s 2 stroke 75hp and ever since Iíve owned it, when I trim up all the way at the end of the day to head home, petrol pours out of the air box. Iíve resorted to putting an old towel down now to soak it all up. Occasionally she floods herself whilst trying to start too but itís not that often. Runs fine when itís running though. Regularly serviced since my ownership.

Could it be float valves sticking or incorrect height?
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Old 15 April 2020, 14:02   #2
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I know of a few older 2 strokes that do that. Assuming it comes to a stop and it’s the bowls emptying themselves?
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Old 15 April 2020, 14:10   #3
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I would imagine it is yes but just seems like an awful lot.
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Old 16 April 2020, 08:58   #4
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Iíve had multiple 75/90ís over the years and they have all done that. The earlier ones with the lift up flap for the oil fill rather than the later yellow cap used leak for fun also when trimmed up.
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Old 16 April 2020, 09:22   #5
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Quote:
Originally Posted by camarine2009 View Post
Iíve had multiple 75/90ís over the years and they have all done that. The earlier ones with the lift up flap for the oil fill rather than the later yellow cap used leak for fun also when trimmed up.
Iíve not got an oil tank on mine, the tank was removed before my ownership.
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Old 16 April 2020, 16:51   #6
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There is series of check valves on the side of the block at the back/side of the crank case.
These have one way valves in them and are designed to allow the excess oil to drain back to the bottom of the crank.
It could have a faulty one or two valves which allows the oil to run back up when tilted.

The one valves are very small and brass in colour which are in between the pipes.
Sorry rubbish description I know!
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Old 17 April 2020, 02:56   #7
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Quote:
Originally Posted by Turbodiesel View Post
There is series of check valves on the side of the block at the back/side of the crank case.
These have one way valves in them and are designed to allow the excess oil to drain back to the bottom of the crank.
It could have a faulty one or two valves which allows the oil to run back up when tilted.

The one valves are very small and brass in colour which are in between the pipes.
Sorry rubbish description I know!
Thanks for that, Iíll take a look.
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Old 17 April 2020, 08:07   #8
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Click image for larger version

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Sorry not the best photo! Hope it helps
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Old 17 April 2020, 14:06   #9
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That’s ok, I can make out the bits I need.
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Old 29 April 2020, 12:13   #10
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You can remove the carb's air silencer, tilt moto up and check if the flooding occurs through the carbs throat, if so, clean the needle valve seat, seemss with stuck debris on the internal body and needle not closing properly. It's a fast check...

Happy Boating
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