Re: Water Getting in Top Cylinder Yamaha 40hp Twin

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June 3, 2016 at 2:47 pm #37650
joesnuffy
Participant

    Thanks,
    I will get my strong flashlight this evening and see if I can’t look into the cylinder through the manifold hole to look for gouging on top and bottom cylinders where the exhaust ports are (they are mid cylinder on the bottom of cylinder). When I had the exhaust plates off I didn’t see anything but I should be able to see better through the intake manifold hole where reed blocks mount using a strong light. I will also check the carb butterflies they are on my workbench right now to see if their is debri in them and if they are snapping shut like they should.

    Here is the manual I have been using.

    http://boatinfo.no/lib/yamaha/manuals/1 … ha.html#/0

    Also put the spec sheet on an attachment it shows specs for reeds also. Most these motors are 3 cylinder motors before 1995. I think the spec for my reeds would be .008 inch warpage. Not very much. Here is an auction of the reeds used in the 3 cylinder set up I think their warpage is considerbly more .028 inches you would see a light gap at that point like on the omcs you mentioned.

    http://www.ebay.com/itm/YAMAHA-6H4-1361 … Xm&vxp=mtr

    Thanks,
    Joe

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