timing would stary to retard @ about 5000 rpm then hit rev limiter at 5200. set timing at 32 deg @ 3000 that put base timing at 8 deg. black soot on transome and loaded plugs . now better timing curves,base time about 18. better idle and cleaner running motors.ps i also tried to keep the mec fuel pumps , didnt work just get the electrics and be done. good luck. brian :cheers2: