'72 100HP 'rude starflite distributor leads

[dstom]

I have been working on this good old engine, primarily on the ignition system. After disassembly, cleaning,setting gaps, etc., I am now in the final reassembly phase. I am concerned I may have accidentally misconnected the spark leads from the distributor to the cylinders. I could not find a listing in the service manual showing which ports fire which cylinder. Below is a rough sketch of how they are currently connected, and I would like to know if that is correct, or how to determine what it should be.

Thanks!


to bow

cyl 2 cyl 3

cyl 1 cyl 4

Ign. coil


I am numbering the cylinders as follows:

upr port 2 upr strbrd 1
lwr port 4 lwr strbrd 3


Hopefully, this makes sense. I am not much of an artist, especially on the computer

 

[Joe Reeves]

Re: '72 100HP 'rude starflite distributor leads

If you're asking how the cylinders are numbered.........

Standing in back of the engine and facing the spark plugs, the cylinders are numbered as follows:

Port...2.....1...Starboard

Port...4.....3...Starboard

 

[F_R]

Re: '72 100HP 'rude starflite distributor leads

You don't even have to remember that. Just start at the top. That is #1. Next one down is #2, then #3, then #4 at the lowest. True of almost every two-stroke outboard

 

[boobie]

Re: '72 100HP 'rude starflite distributor leads

Joe has a good explanation.

 

[dstom]

Re: '72 100HP 'rude starflite distributor leads

I am not asking how the cylinders are numbered, but rather the leads from the distributor. The cylinder numbers were provided in case they were incorrect (but I do not think they were). On the schematic of the distributor, unfortunately the spacing and arrangement got changed in the posting. Imagine a (analog) clock face with 12 at the top and 6 at the bottom. There are 5 terminals for the leads. 2 on the right (say 2 and 4), one at 6 for the ignition coil, and two on the left (say 8 and 10) The leads from which terminal (2,4,8,10) go to which cylinder?

Thanks for your replies!

 

[Joe Reeves]

Re: '72 100HP 'rude starflite distributor leads

The plug wire screw in terminals of the Bakelite distributor cap are clearly marked 1, 2, 3, 4, so #1 wire would screw into the #1 screw in terminal of the distributor cap, etc.

 

[jbch]

Re: '72 100HP 'rude starflite distributor leads

I have a Johnson 100, and with the stator on, you can't read the numbers. With the coil tower facing the rear or roughly the rear, they are numbered consecutively clockwise with number 1 being the first after the coil tower. So 1 is port rear, 2 is port front, 3 is starboard front and 4 is starboard rear. Firing order is 1,2,3,4. Joe explained the physical layout of the cylinders. Hope this helps.

 

[dstom]

Re: '72 100HP 'rude starflite distributor leads

Thanks for both replies! I did not see any numbers on the cap, but maybe I was not looking close enough. I will disassemble and examine more closely. In the meantime, based on the Johnson 100 comment, they do look like the correct placement.

Thanks again for your responses.