Daren89 18 #1 Posted May 14, 2020 Hi what year is this O/R motor for future White Heat 5 build Ta Daren Share this post Link to post Share on other sites
factory 487 #2 Posted May 14, 2020 12 hours ago, Daren89 said: Hi what year is this O/R motor for future White Heat 5 build Ta Daren We can only estimate the date for this engine*, it was made sometime between 1964 & 1965, possibly around mid to late 1964, the reed valve if original would have the plastic reed material, this was used from serial 066809, before that they used a metal reed. *Before June 1967 the serial numbers were sequential with no date coded into them, from June 1967 all serial numbers have the year & month coded into them, the format is YMSSSS or YMMSSSS, first number identifies the year, second (and third) number/s the month, the remaining four numbers are engine S/N which restarted at 0001 each month. David Share this post Link to post Share on other sites
