Yes, it will take quite a number of miles before those rings are fully bedded-in.The basic sealing gets done early, but the rest of it takes quite a few miles.Idling won't do it. You need to load the rings up with some acceleration and deceleration with some real road riding. You don't have to rev it way up or be hard on it. Just give it some loading on some hills and stuff, at moderate speeds.That will help. You are probably running on lower compression than you expected, until the rings seat better.
A word of advice about the bottom end.You need very good bearings from a known top brand bearing company. OEM bearings really are not up to the grade.When you get the crank, you cannot assume that it is trued. Even if it was trued at one time, that is no guarantee that it will arrive at your house in trued condition. Shipping often knocks them out of true. It would be VERY advisable to use dial-indicators and v-blocks or a lathe to check that it is under .002" run-out total. Next, if you plan to build this bike beyond stock at all, you need to address the con-rod problem when you do the bottom end rebuild. The con-rod in the 500 is generally not best-suited for handling higher power or more rpms.My usual advice is that if you are going to go through all that work of a bottom-end rebuild, then build it up as strong as you can, and do it once, so you don't have to go in there again for a long time.
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