I ran into this same problem after having my '05 230 for about 3 months of hard riding. I changed the oil and it went away. It is starting to come back again after another 3-4 months of riding. I was thinking of changing the oil again. My problem was only from 2nd to 1st and 1st to 2nd ... no other gears. my shift lever was not bent or loose with proper clutch freeplay and correct chain tension.
It should be fairly simple to remove by unplugging the wire connection behind the plate and removing the screws that hold it on. If you would like to get rid of it when it's off, shoot me a price for whay you would want for it and the switch.