Ah, that's the hole to drain spark-plug tube! Yeah, cover that hole in order to pour solvents into cylinders.
Now stuff coming out exhaust is fine because exhaust valves on one cylinder or other will always be open; cam duration is a massive 280-degrees. What you'll want to do is use neither TDC or BDC because one or other will be at TDC or BDC. instead, set crank so that both cylinders are halfway between TDC and BDC.
Then measure the amount you're pouring in. Once the top of piston is coated, extra will not increase coverage; extra will just go out exhaust because it's lower. Maybe jack up front of bike so piston-tops are more level.
BTW - do you have borescope? I always look inside to see exactly what I'm dealing with.
Last futzed with by DannoXYZ; November 19th, 2017 at 10:02 AM.
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