I have never injected anything anywhere so long as you give it a good cleaning after every race weekend you will be fine . Maby what it is saying is whats called after run oil and that is for the inside of the motor to prevent rust on the internals which is bad . To apply that take your air filter off and put a couple drops down the carb and take the gloplug out and another few drops down to the piston and sleeve and put it on your bump box or hand crank the flywheel .