Friday 15 August 2014

Yamaha YBR 125 compression testing , cylinder compression values








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 torque setting incorrect , head gasket damage , valve clearances , cylinder/piston/piston rings wear or damage  , cylinder head warp , valve spring broken , valve not seating .



buy a quality motorcycle compression tester so it will last a long time and check regular


                        here is some on ebay UK similar to mine


Yamaha YBR 125 compression testing , cylinder compression values

Yamaha YBR 125 compression testing , cylinder compression values

remove spark plug 

Yamaha YBR 125 compression testing , cylinder compression values

firmly press the tester into spark plug hole 

Yamaha YBR 125 compression testing , cylinder compression values

then open throttle and turn engine over 

                            






see more Yamaha YBR 125 blog posts



No comments:

Post a Comment