Just changed the oil in my 05xb12r and it ran fine on the freeway but when I got on city streets I was having trouble shifting. It was not shifting into 1st or 5th. Then when I down shifted the lever would move but it didn't feel like it really downshifted. Also, when I did get it into first at the stoplights the bike still wanted to roll forward. I had to keep the brake on. Any idea what the problem is???