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2004 40hp over-oiling

3 stroke

New member
Hi, have previously posted this issue, motor was stalling on low revs. Now have more info. Plugs were found to be fouled with oil, leaving motor running on only 1 cylinder. A quick clean of the plugs and she runs sweet. Oil continues to build up and eventually same problem re-occurs. Have changed brand of oil to shell nautilus (previously used with no issues) but it appears to have not helped. Oil pump appears to be set near closed setting as little movement in the rod.
Could be stuffed oil pump, but this seems unusual.

Is there anthing else I can look at? Is the brand of oil critical, or if the viscositis are the same, any big brand should work?

Any help appreciated, thanks.
 
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