Aprilia RS 125 compression testing RS125

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

Here are some good compression testers see here on Ebay uk 

or Here on Amazon uk


Here is 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 

see more Aprilia RS 125 posts here

BUY the ultimate Aprilia RS 125 workshop manual bundle HERE