There is much more risk of a fire from the fuel in the fuel tank than compressed hydrocarbons in the air conditioning system. I have used a propane/butane mix in my air condition system and it cools better than the properly filled R134 system and has lower pressures on the high side. I have no problem recommending them to anyone for off road applications, as it's technically illegal to use them on-road. Some may disagree wtih me, but I have not seen any reason to not recommend it. If you make your own mix, make sure you mix some isobutane in with it, not n-butane. There's plenty of reading on this on the web. There are other alternatives to r134a out there like r152 (what they now use in computer dusters instead of r134a). I would buy a set of manifold gauges and get a good set that has a hose to fill/vacuum the system; it will pay for itself the first time you use it. Also, a vacuum pump is worth the money to evacuate.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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