The AMR timing cover mod and oil pump mod stopped my wet sumping problem.
At times when the bike sits for months, i can check the oil level with a dipstick, and find that i am losing more oil to wiping the stick, than into the sump. Other times, over a week or two, the oil level may drop 1/2 - 1 inch on the stick. I suppose it depends on where the engine happens to stop, and how the ball check valve decides to seat on the O ring.
The AMR mod is well worth the $70 plus 2 way shipping.
I also have a Comnoz sump plug breather, so purging a flooded sump is no problem, so long as I know not to try a vigorous kick at first.
I know others have said it, but I wish to emphasize..... get rid of the automatic anti sump valves. If you have one, AND a pressure gauge, you are reasonably safe, providing you are in the habit of monitoring the gauge.
The manual anti sump valves are OK providing you have an ignition interlock or fool proof method of preventing start up with the valve closed.
When you consider the cost of an anti sump valve, plus cost of interlock, it is really a no brainer to pop for the AMR mod, especially if you can use domestic mail.
I have no affiliation with AMR.
Slick