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What causes a motorbike to seize ??

  • 20-05-2008 7:29pm
    #1
    DublinDes
    Closed Accounts Posts: 259 ✭✭


    I only ride a scooter myself at the moment but I hope to get a motorbike later this year, a 125cc ,nothing special. But I'm wondering the cause of Joey Dunlop's accident " Dunlop's bike appeared to seize ". How does that happen ?? Is it the gears getting jammed ? Didn't the same happen to Martin Finnegan, how does this happen, I would have thought that their bikes would be so precisely tuned it shouldn't happen. Can this happen easily with an ordinary motorbike ?

    ( I know I have asked several questions in this post, but I am very curious ).


Comments

  • #2
    pirate reject
    Closed Accounts Posts: 60 ✭✭pirate reject


    I haven't heard the exact cause of Robert Dunlop's crash but I wouldn't worry too much about general road bikes as they are not set up in any way like a racing bike.

    I would suggest that it is because racing bikes are tuned so highly so as to run at the absolute maximum limit of their capability that they are more likely to fail. They rev higher than reguler bikes, and the stress levels on all the components is far higher. Add that to the fact that the racing engines are sometimes built using lighter parts just to keep the bike's weight down, means that the whole thing is generally more brittle. Regular road bikes are designed to run well within their limits and indeed some bikes like some cars have electronic gizmos to limit the revs etc just to avoid stressing the engine.

    I imagine the biggest risk of an engine seizing on a road bike is if you forget to fill it with oil.


  • #3
    murphaph
    Registered Users, Registered Users 2 Posts: 19,031 ✭✭✭✭murphaph


    One can lock the rear wheel by any number of mistakes...apart from braking, you could shift down to too low a gear before releasing the clutch. If you were leaning in a bend at the time the results could be nasty.

    A full engine seize is extremely rare and as said above, shouln't happen on a road bike unless you let it run out of oil. I saw a Peugeot 306 come round the bend towards me yesterday with a lot of smoke billowing out to which I remarked "looks like he's got oil leaking onto the exhaust" (I presumed he'd spilled some on filling it up) and as he passed I saw a streak of oil on the road shortly coming across his oil filter sitting in the middle of the road and clean road beyond! Hope he realised and stopped in time or he'd have had a seizure.


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