bolens st160 took blades off2sharpen. When I go2mow it stops after few feet; iback offthe taller grass theblades start turning again, but then I go forward and after a few feet it stops mowing again. The belt clutch loosens the belt but then tightens up again and so on... never had a problem until me sharpened blades it don't make sense 2me.do the bades have a certain spot. They don't hit each other trided moving blades 2 original positions dosen,t seem 2 help.there are no pins for setting the bades in a certain position.

Check the belt on the pulleys sounds like it is not tight enough , or came off one of the pulleys . Luck