Yamaha YZF-R1 Owner's Manual

Also see for YZF-R1: Owner's manual Owner's manual Parts catalog Assembly instructions Owner's manual

Contents

PERIODIC MAINTENANCE AND ADJUSTMENT6-106To install a cowling1. Insert the projection into the slot,and then slide the cowling back-ward.2. Place the cowling in its original po-sition, and then install the quickfastener screws.3. Install cowling A or B.EAU19653Checking the spark plugsThe spark plugs are important enginecomponents, which should bechecked periodically, preferably by aYamaha dealer. Since heat and depos-its will cause any spark plug to slowlyerode, they should be removed andchecked in accordance with the peri-odic maintenance and lubricationchart. In addition, the condition of thespark plugs can reveal the condition ofthe engine.The porcelain insulator around thecenter electrode of each spark plugshould be a medium-to-light tan (theideal color when the vehicle is riddennormally), and all spark plugs installedin the engine should have the samecolor. If any spark plug shows a dis-tinctly different color, the engine couldbe operating improperly. Do not at-tempt to diagnose such problemsyourself. Instead, have a Yamaha deal-er check the vehicle.If a spark plug shows signs of elec-trode erosion and excessive carbon orother deposits, it should be replaced.1. Cowling C2. Slot3. Projection1. Cowling D2. Slot3. Projection231312