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Help Compression - FZR250 3LN1

Discussion in 'Yamaha 250cc In-Line 4's' started by ROVER LARRAGUIBEL, Mar 23, 2021.

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  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    My Bike:
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    Looking good Mr Rover.
     
    maelstrom, Mar 31, 2021
    #21
  2. driftwood

    driftwood Well-Known Member

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    My Bike:
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    Spec is 140psi+
    I don't get half that, but I'm on Zeal cams. Zero leakdown with 130psi applied (rings 0.2mm and oil 0.25, cyl honed) and valves lapped - clearances set in the upper half. NFI, but it's going great guns... caught some youngsters on superbikes going up the slide.
    OK, that was bullshit. I only caught one.
     
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    driftwood, Mar 14, 2023
    #22
  3. jmw76

    jmw76 Well-Known Member

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    Measuring the compression pressure on these small engines is always a challenge. The volume of air trapped in the compression gauge/tubes is significant in comparison the the combustion chamber volume. This will through your theoretical readings right out. You can only rely on the manufacturers numbers when they specify a specific instrument to use.
    Just check that all cylinders are the same, then enjoy riding it.

    Peter.
     
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    jmw76, Mar 14, 2023
    #23
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