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CA running problem

6825 Views 8 Replies 6 Participants Last post by  hammerdownharvesters
Well I can't seem to figure it out. New plug wires, plugs, cap, points, condenser and I brought down one of my rotors. I tried timing it and retiming it, cleaned the carb up and put it back together. Reset it to factory setting (1.5 turns out) and put it back together, and nothing I did made it run better than before. Anybody have any ideas?

At the start of the video it is timed per the allis service manual. I adjusted it during the video to fine tune it and it ran a lot better, but the going from running smooth to rough and backfiring has me puzzled.
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I had a very similar problem with my 175 this Summer. Started running like that and I gave it a standard tuneup.
New points, plugs, condenser etc. Ran good for a couple of hours, started again. Pulled my hair out for about a week,
rebuilt the carb, adjusted and readjusted the timing, replaced everything from the Distributor back to the battery.
Nothing helped. It would idle good sometimes, but above 800 rpm it sounded like yours. Thought maybe the advance in the distributor was worn out. Maybe?
Finally went back to my local tractor mechanic for help questions.
After a bit of yes and no questions, he said they had found several bad condensers from their supplier (Tisco) returned by their customers.
Go to NAPA and get a good one. I did that, and it has ran like a stripped snake ever since. Never thought of the condenser being bad out of the box.
Might be one place to look. Also make sure the wire from the coil to the points, isn't grounded where it goes through the distributor.
All electric connections clean and tight. No wiring grounded.
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