Regarding chain tension on a track bike. The chain should be just tight enough that it will not come off the chainring when the pedals and wheel are spinning and the bike is held on it's side or 90deg. from it's normal position. Another way to do this is to pedal the bicycle in the stand at ~75rpms and hold a wrench against the chain and try to derail the chain. It should not come off. The chain should be no tighter than it takes to achieve this. Spicer Cycles(search for web site)offers track bike chain tension adjusters that will allow you to precision dial this adjustment in. Unless you are competing, these are very convenient to have on your bike.