There are a few things that you can do to make your Honda XR80 faster, but it is important to note that any modifications you make will come at the expense of fuel economy and reliability.
1. Install a larger carburetor: The stock carburetor on the XR80 is a 16mm Keihin carburetor. You can install a larger carburetor, such as a 19mm or 22mm carburetor, to increase airflow and improve performance.
2. Install a high-performance exhaust system: The stock exhaust system on the XR80 is restrictive and can limit performance. You can install a high-performance exhaust system, such as a Pro Circuit T-4 exhaust system, to improve airflow and increase horsepower.
3. Install a higher compression piston: The stock piston on the XR80 has a compression ratio of 9.0:1. You can install a higher compression piston, such as a 10.5:1 piston, to increase power and torque.
4. Port and polish the cylinder head: Porting and polishing the cylinder head can improve airflow and increase horsepower. This is a more advanced modification that should be performed by a qualified mechanic.
5. Install a camshaft with higher lift and duration: The stock camshaft on the XR80 has a relatively mild lift and duration. You can install a camshaft with higher lift and duration, such as a Web Cam 109 camshaft, to increase power and torque.
6. Re-jet the carburetor: After you have made any of the modifications listed above, it will be necessary to re-jet the carburetor to ensure that the engine is running properly.
It is important to note that any modifications you make to your Honda XR80 will void the warranty. You should also be aware that making modifications to your motorcycle can make it more dangerous to operate. If you are not confident in your ability to perform any of the modifications listed above, you should consult with a qualified mechanic.
