ignition woes on '73?, 135hp evinrude

[dulind]

this is a motor i recently purchased with the #2 and #4 cylinders not firing, I have determined that this is due to a faulty sensor coil which can only be corrected by replacing the 'canned' timer base assembly. However after removing the flywheel i have a clear view of the sensor coils that would appear to be easily removed. Is this normal for a canned assembly, or has someone changed the ignition system on this motor, or even is it possible that it isn't a '73 as the paperwork says? Any advice or theories would be greatly appreciated, thank you.

 

[Joe Reeves]

Re: ignition woes on '73?, 135hp evinrude

Dulind.... 1973 was the year that introduced the Magneto Capacitance Discharge ignition system. The early timer bases were not a "canned" sealed unit as are the later models, and what you are looking at is a 1973 135hp timer base assy.<br /><br />The sensors appear to be removable, however they are not a servicable item. If a sensor is faulty, replace the timer base assy.