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
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
remove spark plug
firmly press the tester into spark plug hole
then open throttle and turn engine over
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