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Author Topic:   plug electrode mashed flat
litnin posted 05-29-2002 03:10 PM ET (US)   Profile for litnin   Send Email to litnin  
Out on my 87 Montauk w/ original Evinrude 90 on Monday and it was running great until all of a sudden it began to spit, sputter and would not tach over 4200. Pulled the plugs and one electrode was mashed flat. I could see a mark on top that something impacted it. My first thought was broken rings but I put in a spare plug and it ran like a scalded dog. Did a comp check later that night and got 130 on all cyls. Hope it was a chunk of carbon. What do ya'll think?
JBCornwell posted 05-29-2002 04:35 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
My money would be on the carbon, too.

Red sky at night. . .
JB :)

litnin posted 05-30-2002 05:50 AM ET (US)     Profile for litnin  Send Email to litnin     
JB Thanks for the vote of confidence. My dealer told me a few months ago that my motor was, in his opinion, the most bulletproof that Evinrude ever made. I sure hope so. Wife, four kids, six gallons of milk a week. I have other things to spend my money on. Chris
GeneNJ posted 03-09-2003 10:22 PM ET (US)     Profile for GeneNJ  Send Email to GeneNJ     
Had the same problem with an older Johnson, turned out that a chunk of metal from the lower section of the piston had broken off. The metal apparently was then blown out the exhaust port.
captbone posted 03-09-2003 10:30 PM ET (US)     Profile for captbone  Send Email to captbone     
I dont know if you would want to fix something that is not broke but I would run ALOT of decarbonizer thru the motor then use it in every tank full or every other one. I have seen so great results. I use yamahas Ring Free but it does not matter.

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