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There's such thing as motorcycle oil. Its formulated for motorcycle engines. I'd go in to an auto parts store and ask exactly which weight oil to use for your engine.
the intake manifolds beteen the carbs an the motor crack they are fiber material ,,when they crack the motor will miss Its sucking air past the carbs replace or epoxy likr I did ,,seal air off no more miss
In consideration of the arm and leg issue, Google " motorcycle salvage yamaha " and see what you can find. You may also consider gettin the parts needed to fix the carb. Many, but not all, parts are available at the website below. Please rate my answer. Thanks. www.babbittsonline.com/pages/parts/viewbybrand/default.aspx
This is a Haynes, not factory, but it's good:
http://www.yamahaclub.com/forums/topic/16081-xs400-links/
Look in the second post. The folks there are helpful, too, if you've got specific questions on what you're doing/need to do.
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