Timimg light??

[Mr. Ed]

Anyone have issues getting a timing light to work on their outboard??

I have tried 3 diff timing lights and none will work on my '92 70 hp. I have put the inductive pick-up on all 3 cylinders to no avail. Tried all 3 lights on the garden tractor ... all work.

Could it be that the insulation is so good on the outboard that the inductive pick-up is not sensing the plug firing???

I'm geting frustrated with this thing!! Finally have time to fish and I have to finish troubleshooting instead!!

Ed

[boats.net]

No the timming light is my best troubleshooting tool and I use it on all outboards. Some inductive are polarity sensitive, try turning the inductive clamp over.

[Mr. Ed]

Well ... that was too simple. Funny thing is on my inductive pick up it says 'this side towards plug'. To get it to work on the Yamaha I had to put it on the other way.

Now a queation on the timing degree marks. There are no numbers stamped for a reference point (other than TDC). There are groupings of 5 marks ... 4 short marks then a longer one. On the retard side there are a total of 5 marks ... 15 (3 groups of 5) marks on the advance side.

Since the timing need to be 7 ATDC and 20 BTDC. Am I to assume that each small tick mark is 2 degrees and each group of 5 is equal to 10 degrees??

This is on a '92 70hp. The Yamaha book for this model conviently shows the numbers above the tick marks.

Ed