Re: YAMAHA 80 4 STROKE 2003 MOD TIMING?
tommy<br /> your going to have to find a service manual. the CDI can be checked for inputs and outputs. most likly the inputs to it are bad. two plug wires fire everytime. so if your getting correct spark on 1 odds are the signal is there for the other one. if not then suspect the trigger inputs. the only way to test them is with a peak reading multimeter and a service manual.<br /> the system fires both coils at one time, 1 and 4 and 2 and 3. if #1 fires #4 fires with it, when #2 fires #3 fires with it and when 4 fires 1 fires and when 3 fires 2 fires. . so now we are down to pulser coils or an ign coil. the CDI just reacts to trigger signals.resistance on the pulser coils is 495 ohms cyl 1,4 is w/r-b,cyl 2,3 is w/b-b. the tach signal comes from the charging system. if I get a chance ill try to look up some more specifics on the F80 tomorrow, if the pair of 8.1 mercs I am installing does not kill me .