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  1. 05-24-2009, 03:22 PM #1
    Powmer
    Powmer is offline 5000 RPM
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    Question Piston/cylinder wall clearance

    Recently had a "new" powerhead put on my Merc 2001/225HP/EFI. Have had problems getting out of the hole and general sluggishness, since this installation. I am going to put a set of Simon worked heads, new reeds, and a reworked flywheel from Eric Simon. Tore it down to install above and checked clearance between piston and cylinder wall. All were .45mm, and seemed to me, "a real novice" that the pistons were rather loose, but I don't know. I do know there has to be some expansion clearance, but is this .45mm within tolerance?
    Last edited by Powmer; 05-24-2009 at 03:24 PM. Reason: more info
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