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Ford 660 skipping at idle

M

michaelE

New User
I have replaced the points, condenser, plugs, rotor, clip, wires, and carburetor. I have checked the timing at 450 rpm it is at 4 degrees BTDC. It is not smoking, it just seems to missing every so often. The only thing I did not replace is the coil. It has a coil that requires the external resistor which I did replace, it is a 12v system. You can see the rpms change when it misses. Am I just being to picky with a 60 year old tractor?
 
A single isolated 1 cyl drop every now and then, or does a cyl drop and stay out a bit then pick back up.

If the latter isolate the cyl.

Read the plug.

Comp test that cyl.

Post back
 
Bingo. It's too lean.

Unfortunately, most of these carbs are worn sufficiently in the throttle shaft bores that they cannot be adjusted rich enough at idle to prevent such symptoms.

Is the idle mixture screw fully bottomed?

Dean
 
The siamese manifolds always end up with a pair of cylinders a little leaner than the other two, so the mixture has to be rich enough to ignite consistently on the other pair. The modern flow through heads with port injection do not have this issue, so they can be run a little leaner.
 
The carburetor is new, not a rebuild. Idle mixture is not bottomed out, it is about 1 turn out. The plugs look like they are dry carbon fouled. I put the plugs in before I replaced the carburetor. I couldn't get any adjustment out of the original carburetor. When I removed it and disassembled it, it appeared that there were parts missing, so I just went with a new carb.
 
My 660 was sputtering a little running with no load at 900 rpm.
I ran the idle screw in all the way and it seems to help. When
the tractor has a load on the engine , it don't miss a beat at
any rpm.....go figure
 
Is it possible that the distributor is the problem? When I put the timing light it, the light pulse seems to follow the skipping. I replaced the coil with the IC14SB and removed the external resistor.
 
35296.jpg
 
I was more concerned about the lobes, they look very round to me, I saw a picture of an 8n distributor cam and the lobes were very distinguished.
 
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