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Zenith 40TIN backfiring solved
Turned out to be the plug wire connectors. Tech support @ Perma-tune suggested resistorless wires with their ignition system, so I took my spark plug connectors apart to find the small resistors and brass pieces heavily corroded (odd for a 2 year old set of wires). I replaced the resistors with a single piece of 3/16" brass rod and put them all back together with high temp epoxy, effectively making them resistorless. I also opened up my spark plug gaps to .065", also @ Perma-tune's advisement. When I fired it up, the backfires were gone. Now I just have to go through the usual syncronizing process, and the whole thing should idle perfectly. Currently it idles a little lumpy, but at least there's no backfires. Since I don't have a CO meeter to get the idle mixture just right, has anyone ever used the Colortune devise that Eastwood sells? This thing supposedly has some sort of clear ceramic sparkplug, instead of the usual white, with a viewing tube that lets you actually see the combustion process. Blue flame means perfect mixture, yellow means rich, and white means lean. At $65 it sounds interesting. Anybody got experience here or other methods? I've seen a few threads on this, but nothing from someone who actually used one.
Thanks,
69BahamaYellow
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