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I would find some one with a portable seat grinder & they can do the job in a matter of minutes.For me,the seat would have to be very bad before I would resort to installing an insert.I have seen numerous engines where the seats have have come loose.Obviously,if the job is done properly,they should never loosen,but why take the chance.As for installing hard seats for unleaded gas,thats a crock of BS.These are low speed ,low comp engines that ran on unleaded when new.