Starting with engine serial number 100600, changes were made to the cylinder head cooling and valve port geometry that enabled an increase in TBO. All engines with serial numbers 100599 and earlier have a recommended time between overhaul that is the earlier of 500 hours or 5 years. If you have an HKS 700E with a serial number less than 100600 that has more than 500 hours or more than 5 years since the last overhaul recorded in your engine log book, an overhaul is recommended. Contact us for overhaul services.
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