Posted by Brad Gyde on January 11, 2013 at 19:47:23 from (50.33.198.8):
Hey fellas,
I'd like to start out saying I hate to ask a question like this.. For one, I'm usually pretty good on fixing my own issues, and for two, it's kinda a hard thing to explain and diagnose without seeing/hearing my issue..
I have a 1953 Massey Harris 33. I've owned it since I was 16 (almost 16 years now..) but it has been parked for a few years now while I repaint/restore it. I've finally got it back running, but it runs worse than I ever remember it running. It never ran all too spectacular in colder temps, but it's been back together and running for about 2 months now and I cannot find my problem.
The tractor runs rough, but does not seem to lack power. It was always a little "rough" at idle, but now I can't get it to "clean up" at any speed. It will run good for a minute plus or minus, then will act as if it is missing for a few seconds, then clean up and on and on.. I don't know that missing is the right word.. but it will run rough, and kinda pop (but not backfiring)
The details:
I tore it down because it needed head work.. It ran well then, but was blowing past valves and that started the resto work. All valves are NEW and work was done by a reputable machine shop.
Valves set per manual.
All wiring is NEW. Battery is new and up to charge.
Points, condenser, coil, cap, rotor, wires, and plugs are new. All gapped to specs, firing order is correct. Delco C87 plugs (which I always used in it before) and metallic core plug wires.
I cleaned (soaked) carb before painting and installed all new gaskets etc. As far as I can tell it is not sucking air.
Sediment bowl is good and clean and seems to have good fuel flow clear up to the carb.
Carb set per manual, but no adjustments seem to help the issue.. I can get it to clean up some, but never completely.
Pulling the choke slightly (or even fully) does not seem to help at all.. Only make it run a bit worse, or start the "rich" smoking.
Has a thermostat, seems to run worse cold (as should be expected).
Air temps don't seem to affect the problem.. Today it was about 60 outside, and it ran just the same as it did in freezing temps last weekend.
I do get some "frost" on the intake manifold, but so do my other tractors when it's cold out, and they still run fine. Tried wrapping a rag tightly around the intake.. No change.
I'm thinking I have one of 2 things going on:
1) bad plugs... (this past spring I had issues with my Farmall cub similar to this.. It called for the same Delco plug, but ran horribly.. My neighbor and former IH dealer worked on it, he put champion D-21?? plugs in it and claimed that fixed it right up)
2) carb issues.. But it seems like doing some turning of the screws or choking would change things a little bit.
I've double and triple checked everything I can think of.. Anyone got another twist on things? What should I try? Plugs? Pull carb and check everything there again? Sorry for the long post, but wanted to offer as many details as I could.
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