Yamaha YBR 125 blog valve clearance adjustment tappets

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Just done a tappets adjustment on and engine i have removed , ill be fitting the engine soon so ill take some photos of this as i go along .

this is a very easy job with engine out or in .

make sure you change the o-rings you might get away with it but more often than not no and oil will leak
especially around the cam sprocket cover and drip onto exhaust causing excess smoke .

                             remove inspection covers ( 24mm)

change all O-rings 

     remove plastic inspection covers use a good fitting tool to avoid                                              damage to them.

                            remove camshaft sprocket cover

       change this O-ring otherwise this leaks directly onto exhaust

              turn engine over anti clockwise with crank nut ( 17mm)

 make sure piston is at top dead centre and marks are aligned on the
 sprocket ( white marks ) i have painted them white but manufacturer markings are easy to see

 

make sure lower marks are aligned buy viewing in inspection window

then make sure you have free play in both rocker arm 

to ensure you are a TDC on compression stroke (valves closed )

                         check clearance gap is with above specs

                                  adjust where necessary

easy now just check every thing is tightened to specs and turn engine over a couple of times 

make sure things go smooth and fit inspection covers changing orings .

                           

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