I asked my local dealer how often i should replace the rings on my 05 300 and he said never! I checked compression at 150psi which seemed low compared to my KTM 200. I changed the rings (first time for the bike I think) and compression was 150psi tells me my dealer was right - no noticeable wear. I used to change piston and rings once per year on my KTM 200.
Buy a compression tester - measure compression now check every 3 months if it drops off 10-20psi and you feel like you want more power change the rings.
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'05 Gas Gas 300
'97 Aprilia Pegaso 650
'99 KTM 200
'95 ish XR630 (died many times in Oz)
Last edited by stay_upright; 07-29-2008 at 05:08 AM.
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