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Thread: Gem Piston Washer Replacement

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  1. 27-09-2020, 03:52 PM #1
    Benelli B76's Avatar
    Benelli B76
    Benelli B76 is offline Registered User
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    You can see how the piston head is ground and polished for a perfect fit in the cylinder. Not usual for a piston with seal fitted .

    Baz
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  2. 27-09-2020, 05:20 PM #2
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    DCL_dave
    DCL_dave is offline I Like Gingers Best
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    Quote Originally Posted by Benelli B76 View Post
    You can see how the piston head is ground and polished for a perfect fit in the cylinder. Not usual for a piston with seal fitted .

    Baz
    Agreed Baz, that JM piston started life as a machine fit piston, the large screw and leather washer are probably later additions to fix a worn piston seal.
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  3. 28-09-2020, 06:41 AM #3
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    Benelli B76
    Benelli B76 is offline Registered User
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    With my Gem I found that fitting a piston seal dropped the power by reducing the swept volume.

    Baz
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