You should probably just put in the entire quart in, if theres too much, then it will come out the breather tube. For the cable, it may be too old and all stretched out, so I would suggest getting a new cable, if that fixes it, then try the next step. The clutch plates may be frozen together, I'd push it along, then put it in first and ride it around awhile, trying to loosen up the plates alittle. If that fails, then you'd probably have to take the clutch apart, which really isnt that hard, but you'd need to buy a manual for the bike, clymer is a good name brand manual.