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    1980 XS400G Won't Start - Uneven Manual Crankshaft Rotation

    More background: 1980 XS400G Special II (3F9) Purchased non-working - Electric starter turns engine but won't "catch" Cleaned Carbs - New Battery - Checked Valve Clearance - Honed Cylinders - Lapped Valve Seats Checked for Spark (unseated plug and rested against engine during start to see spark)...
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    1980 XS400G Won't Start - Uneven Manual Crankshaft Rotation

    4) As an additional question to help narrow root cause, with the exhaust system removed and the fuel mixture correct, if there is no combustion in the engine, shouldn't the exhaust be flammable? I thought to put a flame on the exhaust port but it does not flame up when the exhaust passes...
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    1980 XS400G Won't Start - Uneven Manual Crankshaft Rotation

    Hello All, long time reader, first time poster. I have really appreciated the information on this site but now i am stuck so need some directed help. Background: I bought a non-working 1980 XS400G Special II. The starter motor drives the engine but it just won't catch. I have cleaned the...
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