Tuesday, 1 May 2012

aprilia RS 125 compression testing RS125





aprilia RS 125 compression testing is important on a 2 stroke and give an idication of piston / rings wear and general engine wear and tear .

aprilia rs125 compression tester


Here are some good compression testers see 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




find your aprilia rs125 workshop manual here 

aprilia rs125 troubleshooting

aprilia rs125 will not start 



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see more Aprilia RS 125 posts here 


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