I was just given a 7.5hp Hiawatha with model #OMC3-7988B, SN# RC4EB-2992. Please help with ant info you may have. It has no spark, but very good compression. Need help and would appreciate any I can get thank-you very much.
Your motor was built by Eska.I dont have the year.<br /> Most use 16:1 mix My book goes to 72 24:1 begins<br />with 71.My info to 72 lists only 7 hp.<br /> so yours is probably newer.Plug gap with solid<br />state ignition is .035.<br /> Good luck.
