So I got my new to me C113 engine going. It starts easily, has good oil pressure that it maintains when warm, doesn't smoke and doesn't seem to leak in any bad places (yet).
It does have one problem though, it idles unevenly/has an intermittent miss.
You can hear it here:
https://www.youtube.com/watch?v=fOYIpO3nxHU&feature=youtu.be
It does it at all RPMs and it also does it under load. The magneto and carb were swapped over from the old engine. The old engine also ran like this but I could have sworn it cleaned up under load but it's been a whie since I ran/worked it (water in oil).
What I've checked:
Set the valve lash before I started it.
Checked for air leaks using a propane torch
Played with the low speed mixture (it's about 1/4 turn from seated).
Played with the timing a bit but didn't find it had any effect either way
Thew in a set of almost new Autolite 388s..which made it run worse! It came with Champion UD16s that I reinstalled
Checked the compression and it had 90PSI per hole
It has an H4 Mag that I'm honestly not really sure about. I've never had it on a tractor that ran great BUT I've also never had it on a nice tight engine. I pulled plug wires while running and I think the miss evened out a bit with #1 unplugged. It has new points, condensor, rotor, cap and wires.
The carb was rebuilt recently with a new throttle shaft bushing. It doesn't feel like fuel to me but I'm often wrong.
My next step is to recheck valve lash, especially on #1.
Any other pointers?
Thanks,
K
It does have one problem though, it idles unevenly/has an intermittent miss.
You can hear it here:
https://www.youtube.com/watch?v=fOYIpO3nxHU&feature=youtu.be
It does it at all RPMs and it also does it under load. The magneto and carb were swapped over from the old engine. The old engine also ran like this but I could have sworn it cleaned up under load but it's been a whie since I ran/worked it (water in oil).
What I've checked:
Set the valve lash before I started it.
Checked for air leaks using a propane torch
Played with the low speed mixture (it's about 1/4 turn from seated).
Played with the timing a bit but didn't find it had any effect either way
Thew in a set of almost new Autolite 388s..which made it run worse! It came with Champion UD16s that I reinstalled
Checked the compression and it had 90PSI per hole
It has an H4 Mag that I'm honestly not really sure about. I've never had it on a tractor that ran great BUT I've also never had it on a nice tight engine. I pulled plug wires while running and I think the miss evened out a bit with #1 unplugged. It has new points, condensor, rotor, cap and wires.
The carb was rebuilt recently with a new throttle shaft bushing. It doesn't feel like fuel to me but I'm often wrong.
My next step is to recheck valve lash, especially on #1.
Any other pointers?
Thanks,
K