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Actually, the service manual states the first valve adjustment check should be done at 600 miles, then every at 3000, 5000, 9500 miles, etc.
The Suzuki gz250 could be running lean or rich from the factory. Depending on how much adjustment (one way or another) they need to do to meet EPA standards. Mine is running a little lean, but a friend of mine with a new S40 is/was rich from the factory.
If you do a search on this forum, you can find and download the service manual. The maintenance chart is on page 38.
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