6b could be: Not buying OEM Suzuki caliper or master cylinder kits or seals if they're available. The aftermarket kits are expensive, poor quality and usually don't fit quite right or are just plain incorrect, and the caliper kits don't include new pistons. Always check to see if OEM kits and seals are available; costs are surprisingly reasonable, they're excellent quality, and the caliper kits include new pistons. And even if full kits aren't available, OEM seals usually are available and much better quality and fit. Aftermarket kits are an absolute last resort.
Then again, that could be part of a more global "newbie mistake", buying crappy aftermarket parts when OEM is still available. I think a lot of n00bs get into a mindset where they think parts from Suzuki couldn't possibly be available, or will be priced too high, or that fleaBay is the only source for parts. Aftermarket gasket, brake, petcock, or carb kits seem like an easy solution, but years of bitter experience have proven them to be worse than useless.
OEM (Original Equipment Manufacturer) parts availability for vintage Suzuki motorcycles is surprisingly good, at least for "operational" parts and consumables. A lot of parts are no longer available, but it's always worth checking with one of the Suzuki OEM parts suppliers before settling for imitation aftermarket parts. For example, aftermarket engine gaskets and gasket kits (as well as petcock, brake, and carb kits) are well-known to be very low quality; it's ALWAYS worth the extra money to use Suzuki parts when they're available.
Of course, there are categories where aftermarket solutions are better than OEM. For example, using an o-ring kit from http://www.cycleorings.com/ and cleaning and re-using your original parts whee possible is the best way to rebuild your carbs, or of course upgrading your suspension, braided stainless steel brake lines, etc.
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