I recently had the dealer do a recall on the crank shaft on my cbr300r. They also had to replace the cylinder wall, piston, rings, and oil pump. Once I finally got my bike back after them having it for 3 weeks, it's weak in revs over 8000 rpm. Takes off great and haves plenty power up to 8k then it's weak from then on. Top speed use to be 102mph. Now I'm lucky to get over 85mph. Any idea what's going on???