Buy compression testers here on Ebay UK or here on Amazon UK
heres a video of a compression test and below some typical results and there general meanings.
To do a compression test properly -
Warm engine to operating temperature
Remove spark plug
Screw in compression tester
Open throttle wide open
Engine kill switch off
Hold starter button for a few seconds until maximum pressure is achieved
As a guideline:
80 psi - should be struggling to start no long left till failure
100 psi - very low change rings / barrel
120 psi - rings wearing
150 psi - rings in as new condition for stock machines
180 psi - rings in as good condition for tuned machines
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