I can't seem to find a good number for what compression should be on your 125,but 120 psi seems low, I would think 150-180 would be a better reading you may want to determine if the compression is an issue before you try tuning it.
Other Aprilia rs 125 help
- Thread starter jameskx100
- Start date
It struggles to start when cold and when hot it will start off a click. I'm starting to think now maybe my rings on on there way out.
If he is lean there could be not enough oil in the cylinder to seal the rings correctly causeing the hard start and low compression.
just a thought