Posted by tarment10 on October 22, 2023 at 13:50:23 from (76.37.218.2):
In Reply to: IH 300u problems posted by tarment10 on October 20, 2023 at 12:26:24:
An update for everyone, but first, thanks for all the commentary here.
I started by looking for issues in the fuel system. I took the carb off and looked to see if it was clogged up as some suggested. No issues there. cleaned a few things up, but mostly just reassembled it and put it back on the tractor.
Then I tried adjusting the advance on the firing timing. The distributor cap was set tight before I adjusted it, so it doesn't appear that it moved while I was using the tractor. I had to advance it fairly significantly though, maybe 15-20 deg., and it started running pretty smoothly. It didn't sound bogged down anymore and smoothly revved up to PTO speeds and back to a low idle. It also starts really easily now, so it looks like I'm back in business. It looks like the folks that suggested it being a timing issue were correct.
To the person that mention the run on issue was not timing related, I see your point, but when I adjusted the timing, the run-on issue completely went away, so I'm not sure what's going on there.
I'm still a little confused how loading it heavily caused the timing to get off by that much with the ignition timing set screw locked in tight, but I guess I'll take it over it being a much more serious issue.
There are still a couple issues I'm working through, namely the low idle is still too high (~800-900 rpm) even with the carb adjusted all the way down. Relatedly the tractor reaches PTO speed when the throttle is at about halfway. I'm thinking that I need to adjust the linkage arm length going to the governor using the adjustable yoke to allow full play of that arm. Separately I'm also afraid that the alternator is shot on it given the voltage on the alternator is only at about 12.2 V while running vs. 12.3 V when shut off, but that's a relatively easy fix.
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