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'96 Yamaha 25HP 2stroke - Backfiring/lean sneeze?
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<blockquote data-quote="kofkorn" data-source="post: 366501" data-attributes="member: 7076"><p>One older trick I've heard, though I haven't tried it and would be a little hesitant, is to take a small propane torch and open it just slightly. then you point it at and move it around the engine block and components while running, focusing on the intake side. If you get a slight uptick in the engine speed, then look more closely in the area that the propane torch is. </p><p></p><p>Again, I'm hesitant to even mention it, as I would be afraid of any potential stray sparks from your ignition causing an issue, but I've talked with a few old-timers who've done it looking for vacuum leaks. </p><p></p><p>Do some research on your own first and make sure you're in a well ventilated area and have an extinguisher available.</p><p></p><p>AT YOUR OWN RISK.</p><p></p><p>Here are some additional Methods:</p><p></p><p>https://www.crankshaftcoalition.com/wiki/Finding_vacuum_leaks</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="kofkorn, post: 366501, member: 7076"] One older trick I've heard, though I haven't tried it and would be a little hesitant, is to take a small propane torch and open it just slightly. then you point it at and move it around the engine block and components while running, focusing on the intake side. If you get a slight uptick in the engine speed, then look more closely in the area that the propane torch is. Again, I'm hesitant to even mention it, as I would be afraid of any potential stray sparks from your ignition causing an issue, but I've talked with a few old-timers who've done it looking for vacuum leaks. Do some research on your own first and make sure you're in a well ventilated area and have an extinguisher available. AT YOUR OWN RISK. Here are some additional Methods: https://www.crankshaftcoalition.com/wiki/Finding_vacuum_leaks Good luck. [/QUOTE]
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'96 Yamaha 25HP 2stroke - Backfiring/lean sneeze?
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