(Undated)  --  There are 225-thousand motorcycles registered in Minnesota - an all time high.  Many of those bikes are back out on the road a bit earlier this year thanks to the mild spring weather.  Safety official Pat Hahn says some riders forget that their skills grew rusty over the winter.  He recommends taking it slow and easy to kind of build up the confidence level bikers had last fall.   Hahn says at least two bikers have already died on Minnesota roads this season.  He says motorists and bikers must be extra alert now that they are sharing the roads again.  Motorcycle fatalities dropped last year - reversing a longtime trend.