400 has 3 or so more HP than the SM -- not sure how, but both are C264's. I may get challenged by someone who knows what they are talking about, but it should work. If the main jet is too rich, it can be turned in. Max power for both is 5 turns out. My guess is that you won't be able to tell the difference between a SM and a 400 carb, or other than appearance the M carb.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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