Originally posted by SpectraSVT
There's a big difference between spending $100 on preventative maintenance and buying a new $6k bike.
True. You can get a lot of protective armor for what a new bike costs. But you can also spend too much trying to make a $1,000, 15 year old bike as good as a $3,000 two or three year old bike.
IMO, improved suspension and steering dampers are also protective equipment, for your bike and your body. Less crashing = less repairs + more fun.
For $150+- he can get Race Tech cartridge fork emulators for his '89 KDX. From personal experience (I had a '90 and my buddy had an '89) I can tell you that this is money very well spent. Improving the forks makes a HUGE difference on an older KDX. Or if he puts the money toward a steering damper, he can transfer that to a new bike someday.
Also, on the KDX, the stock chain guide is a weak link and can easily be bent by rocks or roots, locking up the wheel. I have seen this happen on 3 occassions, and once is was a major hassle. For the cost of an eline guard, you can get a regular pipe guard and and FRP chain guide for the KDX.