1989 Yamaha Excel V6 225 No spark unless computer is May 31, 20171989 Yamaha Excel V6 225 No spark unless computer is bypassed 10-28-2016, 10:06 AM. UPDATE 5/31/17 It was a bad computer. Replaced and the boat started up fine. Thank you all for the advice, between diagnosis and purchasing an official Yamaha service manual, and a special thanks to bondobill who provided the replacement YMIS unit. https[PDF] Yamaha Outboard V6 EXCEL XF Service Repair Maintenance Yamaha Outboard V6 EXCEL XF Service Repair Maintenance Factory Professional Manual 1989 Yamaha V6 EXCEL XF Outboards. The procedures in this manual are Predict Lotto 645 Winning Numbers Excel Lotte by Jul 26, 2013Factory 1989 Yamaha V6 EXCEL XF Outboard Service Repair Maintenance Manual. Factory 1987 Yamaha V6_EXCEL_LH Outboard Service Repair Maintenance Manual. Factory 1987 Yamaha V6_EXCEL_XH Outboard Yamaha Excel: Major Problems - Moderated Discussion Areas In 1989 Mercury capitalized on this Yamaha (and actually OMC too) problem by offering a 3 year corrosion warranty, based on their EDP painting process and aluminum alloys first introduced in 1984. This is also why Yamaha brought out the "Saltwater Series" engines around 1995, to emphasize that they had now corrected that problem.