Never use either to start a propane tractor, You will blow the head clean off of it. The button in the middle of the vaporizer, [not regulator] is a propane primer button, you push it in for 2 or 3 seconds to allow propane to be injected in to the manifold for easier starting especially in cold weather. If I had to guess, you must have an Impaco vaporizer model E if it has this button. This is not a factory vaporizer, the originals were made by Ensign and no longer available. As far as the choke cable goes, Is this carb an Ensign carb? If you have a vaporizer that has a primer button you won"t need a choke cable. If it is an Ensign carb, the cable will come down from the top along the right side of the carb and there should be a clamp/bracket and lever on the right side of the carb as your looking at it, this is were the cable will connect to. Make sure the plug gap is about 0.10 Thousandths less than you would gap gasoline plugs. You need new/good plugs and plug wires and good points for a tractor to run well on propane, This is extreamly important. It should take a 7/8" deep well socket to remove the spark plugs. PB Blaster is a good lube to remove most any bolts/plugs that you will have. Righty tighty, Lefty loosey. The starter button should be a black rubber button on the lower dash panel, it may have been converted to a key start, at some point, Who knows.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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