Posted May 22, 201014 yr Last autumn, my 1981 xs400s stopped running after I changed oil. A week after we changed the oil, my dad drained it again and the new oil was pitch black after only one week. The spark plugs and wires are fine, carborators were thoroughly cleaned, so my dad says that changing the oil likely washed built up dirt off the valves and now they need to be re-adjusted. I lost the haynes manual that I had for this bike and similar models, but it wasn't very good anyways. If I could find the official manual online, would it tell me how to re-adjust the valves? I am a total novice when it comes working with engines and machines; the whole reason why I bought an old bike was to have an incentive and something to learn on.
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