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This is not an all of a sudden event absent a big puddle of oil or big cloud of smoke, neither of which could you miss. Review the procedure to check the oil and recheck it. Bring it up to the proper level and watch it.
Sounds as if the float is not closing all the way and allowing gas to keep flowing threw the carb and is sitting in the cylinder and passing the rings and getting into the oil. try adjusting the float level. This is a command problem.
Bob, I'll be glad to help. If the plug you took out was at the lowest point of the primary housing on the left side of the bike, you indeed drained the transmission and primary. They are both lubricated with the same oil. You need to put a quart of oil back into the primary through the inspection hole at the top of the primary cover. Use a Harley Davidson recommended fluid.
Now, to drain the oil, look for a large diameter hose that plugs onto the frame somewhere below the battery on the right hands side of the bike. They've usually got one of those hose clamps that take the "hose clamp pliers" to open. This will drain the oil. If you're still not sure, contact me directly at this address. wd4ity at bellsouth.net
Too much oil in the system now, Remove a half quart, see what happens. This is common on the Softails and Full Dressers too, when the recommended amount of oil is used. Trial and error through the years have dictated the use of either a 1/2 quart or more, less oil.
The honda xr125 and honda cg125 have the same engine. I have changed the oil several times on my xr125 and I can confirm that you follow the same procedure for both bikes. There is also an oil change demo on youtube for the cg125: