Do not let K75s sit and idle for an extended period. It fouls the plugs and can flood it again. When cold they put out a lot of fuel. (For some reason K75s are more prone to this than K100s.)
From the rider manual:
Don't worry about the smoke. Just ride it.
Smoky starts: If a K bike is left on the side stand or sits for an extended period then the exhaust may be really, really smoky for a few minutes when you first start it. This is due to the horizontal cylinder design allowing oil to seep past the rings into the combustion chamber when the bike is at rest. It is normal and not a cause for concern.
This is especially true for the first few years of Ks production before BMW upgraded the piston rings. (6/88) If you have one of these earlier bikes then you can mitigate smoky starts in a couple of ways:
1) Use the center stand if the bike is going to sit for more than a few minutes.
2) If you're going to use the side stand, then before putting the bike on the side stand, turn the bike off and tilt it a little to the right for 10-15 seconds. This allows the warm oil behind the pistons to drain back into the sump, leaving less oil in the cylinders to seep past the rings into the combustion chamber.
If the bike has been sitting for months or years then it's not unusual to have a VERY smoky start. Just ride it and the smoke will go away
