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Message: [QUOTE="rmracer, post: 856946, member: 56701"] The knocking or pinging sound you are getting may befrom pre-ignition. You can cure this with getting a higher octane gas. My rm 85 runs fine on premium so that should be okay for you if your bike is stock. You may also want to check to be sure your cylinder and piston are in good shape. I just did the top end on mine and it has twice the power. I don't know for sure of the compression, but your manual should tell you [/QUOTE]