Topic: Synchronization – Antique Outboard Motor Club,Inc

This topic has 9 replies, 7 voices, and was last updated 9 years, 6 months ago by Mumbles.

Viewing 10 posts - 1 through 10 (of 10 total)

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May 28, 2015 at 5:41 pm #1623
retiredoz
Participant
So after some trials an tribulations I have my FD-10 running reasonably well, with a bit of a puzzle remaining : The carburetor cam follower is in constant contact with the ignition cam, and I’ve run out adjustment space. So the butterfly seems to be opening a bit prematurely. I thought maybe somebody put a ‘fatter’ roller on it, but the motor seems unmolested. I don’t see any other potential areas of adjustment. Looking for ideas ?
May 28, 2015 at 7:19 pm #17091
frankr
Participant
US Member
Are you aware that the cam slides in or out for adjustment? Loosen the screw at the small end and slide.
May 28, 2015 at 8:26 pm #17096
retiredoz
Participant
Been there done that. Ran outta room, as I said – it’s moved as far as it’ll go.
May 28, 2015 at 8:38 pm #17098
fleetwin
Participant
US Member - 2 Years
Maybe some of the carb linkage is misinstalled causing the problem? Usually those rollers are severely grooved and the opposite problem is present.
Perhaps you could post a picture of what is going on there.
May 28, 2015 at 8:45 pm #17099
frankr
Participant
US Member
Refresh my memory, does that one have more than one link hole in the linkage arm(s)?
May 28, 2015 at 9:24 pm #17105
beerman57
Participant
Run it using a tiller? Are the tiller arm gear and the throttle tower gear lined up right?
May 28, 2015 at 9:44 pm #17109
retiredoz
Participant
First off, I want to apologize to Frank. Just reread my previous post – that came off a helluvalot snippier than I intended. Sorry Frank !

And no, I don’t see any extra holes or any adjustment possibilities in the linkage itself. Although that does provide a clue – it’s as if the pushrod is a skosh too long. Maybe the carb is not the original, but the linkage is ?

Posting pictures appears to be outside my scope or experience or pay grade, at least as of now. Some of us old dogs take forever to learn new tricks..
May 28, 2015 at 10:58 pm #17111
Steve D
Participant
Your last paragraph kills me, outside your pay grade, hahaha. 😀

If you can send the pictures to my email I’ll post them for you oz…

sdpiazza(at)aol(dot)com
May 29, 2015 at 10:51 am #17129
jerry-ahrens
Participant
I worked on a 1958 18 Johnson over the winter that had the same problem. This engine had one of the screws come loose from the air silencer and got itself lodged right up against the carburetor butterfly. Aparently someone then tried to force the throttle open with that screw still lodged in there. This ended up bending the shaft that holds the cam roller. It took me a while to figure this out! I had to bend the shaft back a little at a time to get the sync back to where it would be correct. Just a thought here. maybe this is your problem?
May 29, 2015 at 2:07 pm #17136
Mumbles
Participant
Are you really sure the cam is at it’s maximum adjustment?

I’ve found on these motors the spark plug wires can run tight to the cam preventing it from being adjusted properly. To get around this, I leave the screw in the slot slightly snug and tap the cam at it’s extreme end with a punch. Works every time! 😉
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Synchronization

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