smoking when reved

[bkelly]

This is the new plug. Immediately after I cleaned the carbs, it ran great. Tonight I had to start it up to move it and it ran very rough. I pulled the plugs and they all looked like that. Keep in mind these are NEW plugs with at most 5 min run time. Now what.....

[beandip]

put some anti-seize on the threads this way you wont damage the head pulling them when the engine is hot. run the engine , drive it for 10 min. at least then pull the plugs . Checking the plugs on a engine that was started and shut down cold wont tell you much of anything. I think from what all you are saying the oil rings are not doing there job. Previous post recommended adding ATF to each cylinder and let the engine set for a couple of days . See if this will help to loosen them up. I cant remember , did you change the oil before you are doing all of this?

[bkelly]

No oil change. I'm thinking about changing with 20-50.

[Arne]

Many people prefer 10W-30 in an L-series motor. 20W-50 is a bit thick. I still think the oil rings are either gunked up, or the ring spreaders have lost their tension. But probably gunked.

[Walter Moore]

I wouldn't use 20W-50 unless you only intended on driving it when it was 90 degrees or more.

I have had friends destroy their engines completely with that stuff in cooler weather. It takes too long to get moving when the engine first starts. It starves the main bearings, and worse on a L24, the cam bearings.