CENTRAL OREGON -- A pair of motorcycle riders were injured over the weekend in Central Oregon.  Early Saturday afternoon on Highway 97 in LaPine, a passenger sedan, driven by 71-year-old Marvin Cudd Jr. of Sunriver pulled off to the shoulder to wait for a car he was to follow.  When Cudd Jr. suddenly pulled back onto the highway he struck a motorcycle rider named Joseph Birchell, 36, from Venice, Florida.  Birchell and his motorcycle slid across the highway leaving him lying in the middle of the road with a critical injury to his leg. Birchell was flown to St. Charles Bend, while Cudd Junior was cited for careless driving. On Sunday, while dirt-biking at Wickiup Reservoir, 28-year-old Caleb Krause from Newberg Oregon also had to be airlifted to St. Charles in Bend. Krause, who was not wearing a helmet, seriously injured his leg.