Mid 70's 40hp flywheel timing marks.

[hardwater fisherman]

I have what is a 74 or 75 40hp flywheel with ring gear, that is in use on a 76 40hp rope start motor. The flywheel appears to have 2 sets of timing marks. 1 set is stamped with an E, and the other is stamped with a R. Does E= electric start and R= rope start? I am just curious. The R marks are the ones that line up. I know the cams are different. The other motor is in pieces so I am not sure. Maybe if I was using the other cam I would use the E marks?

 

[F_R]

Cams are different? Aren't the cams ground on the crankshaft?

 

[hardwater fisherman]

The part that comes in contact with the cam roller of the carb is not the same. I thought it was called the throttle cam but again I guess I am wrong.

 

[F_R]

Oh, THAT cam!! I have a hard time relating that to the flywheel marks. But I don't know the answer to the question.

 

[hardwater fisherman]

Yes it is strange you cant see the E and R until the flywheel is off and upside down. But there is clearly 2 sets of marks. They are about 22 1/2 degrees apart.

 

[hardwater fisherman]

Sorry for the confusion what I called the cam is in fact every thing under the mag plate including the support. The cam link and the throttle cam itself. The support for the mag plate is where the timing marks on the flywheel line up.

 

[HighTrim]

No being electric start, or rope start, would have no effect on timing, which is fixed anyways, same fixed position be it manual or electric start. You may be thinking of how you time a simplex recoil starter differently, to the E or the J, depending on whether it is a Johnson or Evinrude, due to cowl design. That sort of thing doesn't apply here though.

Also doesn't have any relation to the throttle cam you mentioned

edit:....are you timing the points? Perhaps im confused as to what you are trying to do. Or are you doing a linc n sync.

 

[hardwater fisherman]

No Title

I have new points and I was going to time them. But I dont have a timing fixture so I was going to use the flywheel. Where I placed the 2 yellow wire nuts you can see 2 marks and 180 degrees to the other side there are 2 more. Maybe these are not even the timing marks? But I cant find any other ones. The ones stamped with an R seem to line up with the hash marks when points are open.

 

[F_R]

Since I make the timing fixtures, I find that very interesting. The whole purpose of the timing fixture is to set the points to break exactly at the right time as the magnets pass by the driver coil. I have to assume the two marks are because of the extra magnets in the electric start flywheel. As always, the points would open as CORRECT set of magnets pass by. The electric start motor uses the same timing fixture as the rope start motor. It is the flywheel that is different. BTW, the extra magnets are because of the alternator on the electric start motors.

Or, maybe I have something to learn here that I wasn't aware of.

 

[hardwater fisherman]

Yes my manual explains about the extra magnets.It only says magnet 1 and magnet 2 charge the driver coil, but it does not say what pair is 1 and 2. But as you said the points will open when the correct magnets pass by. I have learned one thing though. When using the electric start flywheel you also need the driver coil from an electric start motor. They look the same but they have different part numbers. The rope start driver coil specs are 1.45 ohm + or - .4. And for the electric start driver coil it is 2.70 ohm + or -.7. Maybe some helpful advice for someone.