Damaged big end bearing

Discussion in 'Motorbike Technical Discussion' started by Shane, Aug 4, 2003.

  1. Shane

    Shane Guest

    I am able to get a really good price on a mid 80's Suzuki RG250F with a
    damaged big end bearing. I'm wondering if someone can tell me or direct me
    to somewhere to find out how dire this is and if I could remedy it myself.


    Shane, Aug 4, 2003
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  2. Shane

    Dave H. Guest

    Hi Shane,
    It's pretty dire (as in engine-will-self-destruct if not remedied) :eek:(
    It's not an easy job, IIRC the RG's have roller bearing big-ends on a
    pressed-together crank - the individual parts of the crank are built up in a
    hydraulic press with an "interference fit" (the holes are smalller than what
    fits in 'em), and have to be pressed into alignment within a few thou' -
    quite an investment in tooling for the home mechanic! A lot of race shops
    will supply exchange cranks for them (with all the bearings replaced -
    bigends, mains, and any outriggers, plus oil seals etc.), it'll be worth
    getting a few prices before making your decision whether to buy. If you go
    ahead, and can get the crank exchanged, the RG's a nice little bike for its
    era -you'll enjoy it, i think :eek:)

    Dave H.
    (The engineer formerly known as Homeless)
    Dave H., Aug 4, 2003
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  3. Shane

    geoff_m Guest

    Rebuilding a crank is definitely an expert job. The other alternative
    with the RG is to fit a Yamaha RZ350 motor. It is an easy swap and
    nets the "YamaGamma". see
    I almost built oen, but ended up buying a RG500 instead :)
    There was a good article in a Performance Bikes many years ago as
    (nuke the obvious in the address for email)
    geoff_m, Aug 6, 2003
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