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Trying to find out what might cause low compression in all cylinders. Ever one is only reading 70 psi. Trying to narrow it down before I tear into this thing been sitting for theist year finally got to working on it . Expected one cylinder to be washed out but all readying same just low so Trying to figure out where to start. Any help much appreciated. Thanks
 

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How many miles? Ever run low on oil or without oil change?

Do the readings change after adding some oil to each cylinder?

Have you verified that the gauge is reading appropriately with other engines?
Do you get the same reading with a different gauge? (parts stores might lend these out)

Is the timing set properly?
 

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YZFR6... ooodles of HP
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Around 80psi is the bottom to to support smooth combustion. 70psi if that is correct, is not enough to do more then a lumpy poppy stumble. Add some oil to each cylinder and a second gauge as advised.
 
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