Yamaha MBK MW125 2014 Service Manual

CYLINDER HEAD5-12EAS30276REMOVING THE CYLINDER HEAD1. Align:• “I” mark “a” on the AC magneto rotor(with the match mark “b” on the right crank-case)▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼a. Turn the crankshaft clockwise.b. When the piston is at TDC on the compres-sion stroke, align the “I” mark “c” on the cam-shaft sprocket with the match mark “d” on thecamshaft stopper plate.▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲2. Loosen:• Camshaft sprocket bolt “1”TIPWhile holding the AC magneto rotor nut with awrench “2”, loosen the camshaft sprocket bolt.3. Remove:• Timing chain tensioner(along with the gasket)• Camshaft sprocket bolt “1”• Camshaft sprocket “2”TIPTo prevent the timing chain from falling into thecrankcase, fasten it with a wire.4. Remove:• Camshaft stopper plate• Cylinder headTIP• Loosen the bolts and nuts in the proper se-quence as shown.• Loosen each bolt and nuts 1/2 of a turn at atime. After all of the bolts and nuts are fullyloosened, remove them.EAS30277CHECKING THE CYLINDER HEAD1. Eliminate:• Combustion chamber carbon deposits(with a rounded scraper)TIPDo not use a sharp instrument to avoid damag-ing or scratching:• Spark plug bore threads• Valve seatsbac d21211254362×4×