DragBikeMike
Serious Thumper
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SuzukiSavage.com Rocks!
Posts: 4406
Honolulu
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Without the plug in the airbox drain you have been pulling the worst kind of crud directly into your engine. All the trash, grit, sand, dirt, pebbles, water, etc. directly off your rear wheel. That probably didn't do much good.
The significance of checking how much oil accumulates relates to diagnosis of your problem. If you don't accumulate oil in the airbox, then it is most likely not an engine breather issue. The oil only has three ways to exit the engine: leakage, breather system, consumption.
Leakage will be obvious. Puddles under the bike, goo all over the engine, etc.
Breather system should manifest in large amounts of oil accumulating in the bottom of the airbox.
Consumption is a bit harder to nail down. It either leaks down the valve stems/guides, or gets pulled past the rings.
I would run it with the plug installed for a good long time. Start with the oil level normal. When you have to add oil check your air box drain. That way you know how much you used and can compare that to how much has accumulated in the airbox.
As far as checking oil level goes, I always use a small level across my starter to get the bike exactly level. I also always check it when the bike is upright on my poor man's stand (an elaborate system of 2x4s).
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