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Thread: Question about crash starting a 4-inline

  1. #1
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    28th August 2006 - 22:14
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    Question about crash starting a 4-inline

    I have crash-started quite a few bikes in my life but until last week, all of them have been thumpers (just coincidence).

    Last week I was forced to crash-start my zx6r and I was totally surprised for two reasons:
    - even a bit flooded it started almost instantaneously
    - the engine didn't have almost any kick when engaging the clutch

    I know the 4-inline engines are smoother, usually have a bit lower compresion than the thumpers and I also know this bike's clutch is much smoother when engaging/disengaging compared to any of the thumpers I've crash-started, but I didn't feel almost any kick at all when dropping the clutch.

    Should I be worried about low compression or it is normal on this type of bikes.

    As a background: the bike usually starts very well even when cold. Also, the bike doesn't smoke. It only puffs a little when really pushed.

  2. #2
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    26th February 2005 - 15:10
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    Reason is that crash starting, the compression resistance on a 600 is only that of a 150cc cylinder. You'd expect that bumping a 150cc would be easy. And a 600 is even easier, because you only have 150cc of resistance , but you have a 600cc flywheel weight to help bump it over.
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  3. #3
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    23rd April 2004 - 19:16
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    At least you are on to it. I had a friends flat mate tell me that you needed to engage the starter (as in push the starter button) when you were crash starting a bike or it wouldn't start. I asked him what he would do if the battery were completely flat and his reply was that he'd be calling for a pickup... some people!
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  4. #4
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    25th September 2009 - 18:05
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    Quote Originally Posted by Ixion View Post
    Reason is that crash starting, the compression resistance on a 600 is only that of a 150cc cylinder. You'd expect that bumping a 150cc would be easy. And a 600 is even easier, because you only have 150cc of resistance , but you have a 600cc flywheel weight to help bump it over.
    Add gearing differences between the high-reving 4-pot and the thumper and there is your answer...
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