I've broken 2, both on the same bike. Make sure you get a quality chain. Don't go cheap. Cheap chains are anything but.
I won't buy anything but high quality x-ring chains now. And steel sprockets. Don't be tempted by aluminum sprockets because they're "race" quality. They don't last well at all.
Brakes: buy only the best quality pads. Not the time to go cheap. Remember, there is no power brakes on (nearly all) bikes. I strongly recommend sintered pads. The price of the pads is generally higher, and it wears out your rotors much faster than organic pads. In exchange you get superior stopping power. Less grip and pedal effort is a really good thing when things get ugly.
Don't buy the cheap Fram motorcycle filters. I'm sure you already know this. Compare the quality of the Fram filter to a K&N (oil filter) and you'll know immediately what I'm talking about. Steer clear of automobile engine oil. There's stuff in moto oil that helps the clutches operate more smoothly. I've tested this theory extensively, but seem to forget every now and then. <img src="/forums/images/graemlins/rolleyes.gif" alt="" />
Change your fork oil every 3 years at least. Fork seals are $15 and well worth it if they start leaking (they will if they don't already).
Be careful with LED indicator and stop lamps. Most are not very bright.
Buy a headlight modulator. They have brake light flashers too. Anything to draw more attention to yourself.
Loud pipes do not save lives. They piss people off and make it hard on other bikers. Plus they ruin your hearing.
Take a safety course. Lane Community College in Eugene had a really good one when I lived there. If you've taken the basic course already, take the advanced course. It's a great refresher and you get to use your own bike.
Try on helmets until you find one that fits you right. I tried several brands before I found an XL that I could actually put on. Make sure of the fit for the brand
and the model. I tried one model that fit great, but the next model hurt my (huge) forehead. If you think the helmet that fits best is too expensive where you tried it on, buy it on Ebay. That's what I did, and I got a better selection of paint jobs than at the local motorcycle retail chain. Make sure your helmet is DOT as well as Snell approved. Make sure you get a full face helmet. 43% of first hits happen in the chin guard area of the helmet. If your helmet doesn't have a chin guard, guess what takes it's place.
ATGATT. Because having a nurse scrub the gravel out of your skin with a stiff bristled nylon brush really sucks. Don't ask how I know.
Don't buy cheap gloves. Every biker I've seen down with cheap or no gloves won't be blogging anytime in the near future.
Graphic/sobering web site. Roadrash defenseI'll have more later. <img src="/forums/images/graemlins/smile.gif" alt="" />