I think the air cleaner pipe from an M will be a smaller diameter on the top end than the original from a 400, and it will not match up to the port on the air cleaner itself. Just guessing, but I think a pipe from maybe a Super M or a 450 should fit your 400. OR, if you have that pipe from an M, take it to a muffler shop and they can use it as a pattern to make you a brand new pipe that WILL fit.
That front end shaking is because it is worn out. It can be rebuilt with new bushings and etc., but there is NOTHING to adjust.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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