First thought is the idle screw. Assuming it is all the way out. Check the plugs to see if it is burning rich or lean. Check valve lash. Check for air/fuel leaks. One culprit is the primer pump. The rubber does deteriorate. After that, you are into the carbs. Clean out all the jets and passages. Check the 2 diaphrams for cracks on each carb. There is one for the buterfly and a small one under a side cover. Make sure the choke plungers are moving well. Make sure the fuel bowl float is good. No fuel inside it. Check that the fuel bowl valve isn't dried out and has a good. Seal.
Thanks for the video, changing my oil in the BF650 for the first time this weekend. Surprised these motors don't hold more oil.
Glad it helped
¡Gracias! Éste video me servirá.
Any ideas what to do when the KBF 650 is idling to high?
First thought is the idle screw. Assuming it is all the way out. Check the plugs to see if it is burning rich or lean. Check valve lash. Check for air/fuel leaks. One culprit is the primer pump. The rubber does deteriorate. After that, you are into the carbs. Clean out all the jets and passages. Check the 2 diaphrams for cracks on each carb. There is one for the buterfly and a small one under a side cover. Make sure the choke plungers are moving well. Make sure the fuel bowl float is good. No fuel inside it. Check that the fuel bowl valve isn't dried out and has a good. Seal.