I would have thought the force that goes through the conrod would wear out the bush unless you don't run your engine in correctly in which case it would just snap before the bush wears enough for there to be excessive play. Maybe somebody wth better knowledge can clarify this?
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Just a brief update on mine
Ran at nationals this weekend and performed flawlessly didn't cut all day and ran an hr's worth of finals
Finally dropped its nuts in the last one after over a gallon of fuel, so come Sunday I will be tuning for power and economy happy days!!
Kyosho MP9 WC