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I have seen several oil coolers (mocal and seetrab) leak at the flare of the fittings. Mark the tapered flare on the fittings attached to the cooler with a magic marker. Tighten up hose fittings to the cooler. Remove hose fittings and inspect contact pattern on the cooler fittings. I have seen this problem a number of times, irregular contact at the flare. The aluminum crush washers that fit in the flare "contact cone" can solve this leak. To find the leak for sure, pressurize the cooler with compressed air and spray simple green or formula 409 all over and look for the air bubbles coming out.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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