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This is a discussion on FCB Top End within the Technical forums, part of the Caferacer.net Forums category; Last year I found some black plastic bits in my oil. I assumed that it could be from the chain tensioner and I was right. ...

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  1. #1
    Member RPAQUETTE1's Avatar
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    FCB Top End

    Last year I found some black plastic bits in my oil.
    I assumed that it could be from the chain tensioner and I was right.
    The wheels had all sorts of chunks missing.

    I have taken the engine out of the bike and stipped it down and removed cylinders.The slipper tensioner I bought from THR, I was told may require that I machine 2 mm out of the chain tunnel. But it seems that there is plenty of clearance in the tunnel already. Maybe I do not have to remove any stock?

    Also I have found some very slight scratches in the cylinder walls
    that face the front of the bike. I,m thinking maybe I can hone these out and replace rings so long that I stay within wear limits.???

    I plan on checking everything I can will I'm there including valves.
    Also want to bead blast cooling fins and all and repaint with silver
    high temp paint, any recommendations?

    Any advice would be appreciated.

    Tahnks, Rob
    FCB #313

  2. #2
    Moderator ROSKO's Avatar
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    Just letting you know you're getting zero replies because you're completely right on the money. Carry on.

  3. #3
    Member RPAQUETTE1's Avatar
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    Thanks ROSKO,
    Wasn't sure if I should use new rings even if cylinder honing ends within wear limits. I will check the rings while in the cylinders to measure end gaps.
    Even so, I think new rings in a honed cylinder will seat better.
    I will keep you posted to make sure I don't F this up.

    Rob
    FCB #313

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  5. #4
    buckandaquarter's Avatar
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    You have to measure to find out if it is within tolerance. You may need to find specs on the motor. You will need to hone it first before you find out if you are over the limit.

  6. #5
    Senior Member kenessex's Avatar
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    This brings up a question I have been wondering about. The rule always is put in new rings when you have the top end apart. Has anybody ever used old rings after a hone job if the ring gap is within spec?

    Ken
    WERA 119
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    AHRMA not anymore
    \"Think twice before you speak, and then you may be able to say something more insulting than if you spoke right out at once.\"
    Evan Esar
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  7. #6
    Moderator imslow's Avatar
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    be careful with the beads . . . . I would recommend against bead blasting. Just clean it up and paint it.
    Inertial dynos just make people cranky

  8. #7
    Moderator imslow's Avatar
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    ps, use brake caliper paint.
    Inertial dynos just make people cranky

  9. #8
    Moderator joe c's Avatar
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    never used old rings. when i go in, i go in deep.

    why paint it? cant see paint will remove the heat that much faster. kind pointless if you ask me. but id imagine it cant hurt really.

    youll get some light scuffing. its typical. the rings are sliding up and down at a pretty good rate.

    a hone and fresh rings always makes things happy. always nice to have an extra set of cyls ready to drop on too.

    jc



    not a pretty boy honda rider... i\'m fag on a TTR

  10. #9
    buckandaquarter's Avatar
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    If you want to media blast, try walnut shells. They won't damage your engine if they get inside. I have heard of soda blasting as well, but baking soda is mildly caustic.

  11. #10
    Member RPAQUETTE1's Avatar
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    Thanks for all the input. I will bore mic the cylinders once at work monday. The slight scratches that I see seem to be caused by piston skirt. Which probably means that the rings could be worn allowing the piston to tilt in the cylinder a bit. I will check all this
    but still think that I should find some new rings anyway.
    I'm sure new rings will seat better in a newly honed (within wear limit) cylinders.
    I want to repaint engine because of what looks like rust on them.
    I will clean them thoroughly first and evaluate. Was wondering about cooling with paint on! Thanks for for the tip about using brake caliper paint.
    Rob
    FCB #313

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