Starting with engine serial number 100600, changes were made to the HKS 700E cylinder head cooling and valve port geometry that enabled an increase in TBO. All engines with serial numbers 100600 and higher have a recommended time between overhaul that is the earlier of 1000 hours or 8 years. If you have an HKS 700E with more than 1000 hours or more than 8 years since the last overhaul recorded in your engine log book, an overhaul is recommended. Contact us for overhaul services.
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