Obtain a new set of jets for your motorcycle. The size of the jets you will need will depend on your specific bike and modification, so be sure to do some research to determine which jets are right for you.
Remove the air filter. To do this, loosen the screws that hold the air filter cover in place and then remove the cover. Be careful not to drop any of the screws into the engine.
Remove the carburetor. To do this, loosen the hose clamps that connect the carburetor to the engine and then remove the carburetor. Be careful not to spill any gasoline when removing the carburetor.
Disassemble the carburetor. To do this, remove the screws that hold the carburetor body together and then separate the carburetor body into two halves. Be careful not to lose any of the small parts inside the carburetor.
Replace the jets. Remove the old jets from the carburetor and then install the new jets. Be sure to tighten the jets securely.
Reassemble the carburetor. Put the two halves of the carburetor body back together and then replace the screws that hold it together. Be careful not to over-tighten the screws, as this could damage the carburetor.
Replace the carburetor. Install the carburetor back onto the engine and then replace the hose clamps that connect it to the engine. Be careful not to over-tighten the hose clamps, as this could damage the carburetor.
Replace the air filter. Install the air filter cover back onto the motorcycle and then tighten the screws that hold it in place.
Start the motorcycle and let it run for a few minutes. This will allow the new jets to seat themselves.
Test the motorcycle's performance. Take the motorcycle for a test ride and see how it runs. If the motorcycle is running rich, you may need to go up a jet size. If the motorcycle is running lean, you may need to go down a jet size.
Be sure to make adjustments to the jetting gradually, as making large changes all at once can damage your motorcycle.
