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1981 gs 650

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    1981 gs 650

    I have a 1981 gs 650. shaft drive, 18.160 miles and just had it tuned up. It has a little bit of light backfiring when it first starts it but then it runs smooth. I burnt 3/4 of a tank while driving a 30 mile highway stretch and I kept it under 60 MPH. I installed new plugs wires, changed the oil and filter, air filter and tried sea foam, and it made no difference. Any ideas would be appreciated........Thx
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