1997-250hp Yamaha # 5 & 6 Plugs corroding

soundsfishy

Cadet
Joined
Jul 30, 2003
Messages
6
3 Years ago found # 6 cylinder spark plug corroding (looked like a lean condition). Replaced Plug, wire/coil assy., Computer, no luck.<br />Dealer replaced head & spacer this spring. Now the # 6 and # 5 spark plugs are burning up. This corrosion/burn (the ground strap on plug eventually disappears) takes about 30 hours to occur....<br />I'm at wits end.....I believe that salt water is somehow backing up into the cylinders?...again it started for 2 years with just # 6 that's the first plug up from the waterline...# 5 is the next Plug up on the crank.........<br />I'll send a $50 check to anyone with the fix & I'm serious !!...Thanks !!!
 
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