I believe I remember reading that the injectors for the maybe the SWD9, for sure the 600 and 650, are different(upgraded for more HP) than the WD-9. The WD-9 ones would physically fit in the head but not flow as well. Same deal with the injection pumps.
If by the "air cleaner top" you mean the breather cap that's above the hood, most pics of restored 650's I've seen have the plastic bowl type like the 560's had. Mine has the glass jar type(with a little green JD tractor in the jar). WD-9's could either have the glass jar or the mesh breather type I think. They'll all "work" as long as they're the right size for the tube, which is bigger than an M.
I bought my 650D for $300. It was stuck and had been sitting for quite a while. Had it running the same day I got it home. If you get this one and for some reason it's beyond repair, I'd sure be willing to buy the "650" emblems off each side of the hood. I'd pay a pretty good price for them too!
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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