Re: 1972 TX340 Engine Question
If you stop by your Polaris dealer and check his first volume shop manual it lists the models and their engine numbers in the front of the book. I think you are correct, you likely have a 440. It should work fine with no mods needed to you chassis. If it came with carbs it probablly with be close on calibration otherwise while wou are in the shop manual write down the basic setup. If yu have to use clutch or others items off of the 340 carefully check crank taper and any other vaiables between the two.