Gambles is right on about the push rods. Even though I've been twisting wrench's for 30+ years, we all make mistakes. The rocker arms are not adjustable, so I'd lean towards the intake exhaust push rods may be mixed up on a cylinder. Before you tear back down, do a compression check to see if you bent a valve. Just saying from experience (wink) an exhaust valve push rod in an intake position can bend a valve. It may idle just fine to a little rough but when you rev it up it will miss, buck, cough and spit.
The intake would have to really be loose to act the way your describing, because you can't really get the intake cocked one way or the other.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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