The bike is a Honda CBR250R. It had good HP at 23 HP all season. It also had good torque. The bike has a dynojet commander and akrapovic end can muffler. It has been running Shell 91 for fuel. The engine has 4200 kms at present. The bike was lowsided and crushed the end can muffler a month ago which I replaced with a new akrapovic end can muffler. Now the HP and torque are down. Over the last month I have progressively: 1. replaced the dynojet commander. 2. replaced the spark plug. 3. replaced air filter. 4. remapped the new commander to make the bike less lean at higher rpm. 5. checked the valves. The chain slack is good and I find no noticeable restriction on wheel spin. But still the bike is down 8%-10% on HP and doesn't have that get up and go coming out of corners or climbing hills like it did before. What do I try next? The bike is in a Spec series so I can not make mods. I need to find what has changed and fix that part. Thanks for your thoughts.
Last edited:
