Do you have to re-jet the carburetor when change spark plug or air filter on a 2001 Yamaha yz 250?
No, you don't need to re-jet your carburetor when replacing the spark plug or air filter on a 2001 Yamaha YZ250. These adjustments have minimal impact on the overall air-fuel mixture. Re-jetting the carburetor is more commonly necessary when making significant modifications to the intake or exhaust system.