Posted by flying belgian on December 02, 2007 at 13:06:25 from (98.132.233.132):
In Reply to: Get Me The Gun! posted by Allan In NE on December 02, 2007 at 11:43:37:
I have told this story before on here but will gladly tell it again. Had the same prob with my 706 gasser a few years back. I was absalutly convinced it was spark related, so narrowed it down to plugs as I had replaced all other elec. parts but only cleaned and not replaced plugs as they were only 6 months old having been new at time of overhaul. Was telling problem to young mecanic at case shop and he was a recent grad from local voeh-tech. He said they had a see through model off a cylinder in which they could adjust compression and watch it spark. Results showed all spark plugs will fail after given enough compression but the champion will always be the first to fail. In one of your posts you stated black smoke rolls out at mid rpms so I suspect yours is a fuel prob but if you should determine it is a spark prob the first thing to do is throw out the champ plugs. Incidently in their test the NGK was the plug that sparked under highest compression. Hope this helps. The Flying Belgian
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