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Posted by on August 9, 2007, 8:50 pm
wrote:
>Gerrit wrote:
>>Why is it harder to start a cold engine vs starting an already warmed-
>>up engine, special on older bikes. Based on the three primary
>>factors: Spark , Fuel/Air mix and Compression. What improve so much?
>
>The distribution of burnable fuel/air mixture in the combustion chamber is
>rather random. In order to ignite, the cold engine needs a richer mixture to
>improve the odds that there will be burnable molecules in the spark gap as
>current jumps to the ground electrode.
>
>Once the engine is running, a leaner mixture can be used.
>
>Older Japanese motorcycles with ignition points and low voltage coils were
>harder to start than modern bikes with electronic igniton. They either needed
>more voltage so the spark plugs could be gapped wider, or they needed a
>rather rich mixture. This resulted in spark plug fouling and the need to
>clean the plugs every three or four thousand miles.
>
maybe on 2 srokes but none of my 4's, among whic are xs-654'd-750's-1100's and
many sr 500's. the plugs on those stayed fine. i do cheat, though, i keep them
tuned, adjusted and started at least once every 2 weeks.
many yamays have weak sparks, but hotter plugs help a lot.
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