Trying to start the bike...

Well I got the bike put back together, but am having some trouble getting it to run. Hopefully someone out there with more experience with bikes can hear something in these clips that I can't. The easiest thing I can think of is to replace the spark plugs, which I'm pretty sure are original (1986)...

first attempt:


second attempt:



third attempt:



fourth/fifth attempts:



so, any ideas?!