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  1. #1
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    What exhaust cut is this?

    Pulled the heads off of my 225 Promax and and curious as to what cut is this on the exhaust port? They arnt a arch but have a raised-heightened cut on each one of them. Is this stock or something somebody did?
    Attached Thumbnails Attached Thumbnails 20191202_063914.jpg   20191202_063957.jpg   20191202_064145.jpg  

  2. #2
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    Maybe somebody just matched the port in the sleeve to the block without smoothing the radius? I would clean it up...

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    corrosion on the cylinder liner..

  4. #4
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    Quote Originally Posted by powerabout View Post
    corrosion on the cylinder liner..
    Ya. Mota been sitting for 4 years

  5. #5
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    Could be some very heavy chamfering. I agree with nitro_rat and clean it up. Make it uniform.

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    The 2,5L Merc 260HP has a meassurement from top of port to top of block of 40,5mm
    If you could throw a mirror down there you might to be able to see if its hand made or factory made.
    Last edited by A164; 12-04-2019 at 12:12 AM.

  7. #7
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    Quote Originally Posted by A164 View Post
    The 2,5L Merc 260HP has a meassurement from top of port to top of block of 40,5mm
    If you could throw a mirror down there you might to be able to see if its hand made or factory made.
    Yes it measures 1.60" exactly.

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