px 125 heads.....................

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shamrockexpress
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PX125 cylinder heads whats the difference in a 9b and 11b i can make out a slight difference in combustion chamber shape one seems to have slightly more volume than the other,,,,,,,,,,,so whats the best to use is one more modern than the other.
ever who gets the right answer knows there onions,,,,,,,,,,,,,,,,,,,,,sad git :-)
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