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Do I need to replace the crank journal bearings?

Discussion in 'XJ Technical Chat' started by Rasput, Mar 30, 2020.

  1. Rasput

    Rasput Member

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    Rebuilding a 1983 seca 900 engine. Found some shiny spots on the crank journal bearings. No gouging or roughness and they feel smooth to the touch. I included pictures. Do I need to replace these due to their condition?
     

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    Rasput, Mar 30, 2020
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  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Those are in great visual condition. Check clearances with plastiguage though.
     
    k-moe, Mar 30, 2020
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  3. JBurch

    JBurch Active Member

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    I would agree with K-Moe, they do look to be in very good shape. Just out of curiosity, how many miles on the engine? As a precaution remove the shell and make sure there is no foreign matter on the back side of the shell, and make sure the case is clean; do that before you plastigauge your clearance.
     
    JBurch, Mar 30, 2020
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  4. Rasput

    Rasput Member

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    Either 21kish or 42kish. Two gauge clusters came with the bike lol. So I shouldn't be worried about the difference between the shiny and matte areas? The crack journals are in great shape too in my opinion. 20200329_093950.jpg
     
    Rasput, Mar 30, 2020
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  5. Franz

    Franz Well-Known Member

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    You bearing faces on the top two photographs remind me of mine on my old CB 750 SOHC four. I never had any problem with mine. Engine ran great for years.
     
    Franz, Mar 30, 2020
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    Rasput likes this.

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