Posted by kopeck on September 09, 2013 at 17:30:17 from (66.243.206.248):
Don't fix what isn't broken right?
So the throttle shaft in the Marvel on my BN is really worn, it still runs OK, not as good as it should have but better then you would expect with that much play. On the shelf I had a Zenith that was freshly rebuilt for a tractor that isn't ready for yet so I figured what the heck, let throw it on.
I bolted it on, syced it up (WOT trottle, WOT on carb, pin slides in freely) and fired her up.
Well, it idles nicely but anything over 1/2 throttle causes some massive surging. Not just a little hunting, like full range of RPM surging, non-stop.
At first I thought it was the carb but if I held the governor shaft steady it ran well.
To sync the carb I had to adjust the yoke on the rod a lot, it surprised me as I was doing it but I figured two different carbs...
I lengthened the rod back out to about where it was on the Marvel and it now doesn't surge but it's really the exact opposite of where it should be (the pin sides in when the carb and the throttle are at low idle). I didn't test governor response but I'm guessing it's not going to be great.
I didn't try the bump spring but isn't that more of a minor correction adjustment?
Everything is moving freely/not binding up.
K
This post was edited by kopeck at 17:32:26 09/09/13.
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