Sunday, 6 July 2014

Yamaha YBR 125 blog valve clearance adjustment tappets







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 .






Yamaha YBR 125 blog valve clearance tappet

                             remove inspection covers ( 24mm)

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

change all O-rings 

Yamaha YBR 125 blog valve clearance

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

Yamaha YBR 125 blog valve clearance
                            remove camshaft sprocket cover
Yamaha YBR 125 blog valve clearance
       change this O-ring otherwise this leaks directly onto exhaust
Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance


Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance
              turn engine over anti clockwise with crank nut ( 17mm)
Yamaha YBR 125 blog valve clearance

 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

Yamaha YBR 125 blog valve clearance 

make sure lower marks are aligned buy viewing in inspection window

Yamaha YBR 125 blog valve clearance

then make sure you have free play in both rocker arm 
to ensure you are a TDC on compression stroke (valves closed )

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance
                         check clearance gap is with above specs
Yamaha YBR 125 blog valve clearance
                                  adjust where necessary
Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

Yamaha YBR 125 blog valve clearance

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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