 Dan Hauter wrote:
The tractor started but ran rough and smoked.
... If I found the right spot on the choke the tractor would run. I kept adjusting the needle valve & finally got the tractor to run at idle but I couldn't throttle up. |
Okay, so some things don't add up here. If it's rough and smoking, but you can pull out the choke to make it run... and it'll idle but not throttle up...
In the realm of a fuel system problem, these don't equate. If it's running rough and smoking, that means you're not getting incomplete burn cycle, so it's over-rich... which in a fueling context means you either have an obstructed intake, too high a float level, a failed/stuck float valve, or an obstructed exhaust...
But pulling out the choke obstructs the intake, thus forcing an enrichment, which would NOT lean out an over-rich condition, it would simply make it worse, not better.
The fact that it won't throttle up is another oddity.
Put them all together, and I'm gonna bet that this is actually an ignition problem. You could have a stuck advance mechanism, a sacked-out contact point spring, or the points and/or point cam is worn, or the distributor shaft bushing is worn out and sloppy, or the condenser is bad... or the coil has failed... or any combinations of any-or-all-of-the-above.
If it's not that, pull of the manifold and check it for obstructions (a mud-dauber nest in there... or a crack between the exhaust side, and the intake side, thus leaking exhaust into the intake).
Edited by DaveKamp - 11 Jan 2023 at 11:51pm
Topic Options
Post Options
Thanks(0)
