Friday, 15 August 2014

Yamaha YBR 125 compression testing , cylinder compression values







Yamaha YBR 125 workshop manual

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Yamaha YBR 125 compression testing


compression testing is important , it give an indication of wear in the cylinder barrel and valves etc .

Yamaha YBR 125 cylinder compression values

Standard - 170 psi
min - 148 psi ( investigate cause )
max - 190 psi]

low compression on a yamaha ybr 125  can be caused by many factors

loose spark plug  , cylinder head bolt tourque setting incorrect , head gasket damage , valve clearances , cylinder/piston/piston rings wear or damage  , cylinder head warp , valve spring broken , walve not seating .



                                  buy a quality motorcycle compression tester
                                   so it will last a long time and check regular
                                         heres some on ebay similar to mine
                                           there are better though 




remove spark plug 


firmly press the tester into spark plug hole 


then open throttle and turn engine over 





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