Here you maintenance guys go straight from the Buickguy himself. With over 100,000 miles logged on his 87 Wineberry Rebel. This is how he does it.
Here's the write up on the Super Secret Longevity Treament for your Rebel. No one can guarantee that the Rebel will go X number of miles but there are things you can do to make it "Live Long and Prosper"
Keep in mind, my Rebel isn't my first rodeo. I had a bunch of old crapcycles before the Rebel. Fixing other peoples messes gets old. The Rebel I got brand new and was determined that it wasn't going to be the rattling banging refugee from a scrapyard that all the used cycles I had were. My Rebel had the advantage of spending its off time in a garage. The heavy miles I put on were early in its life (87-93) and most of that time had the national 55 mph speed limit (yes everyone did 60-65, but still). And of course it benefited from my obsessive/compulsive nature.
So, here's the short list.
Change the oil. Change it often. No more than 1500 miles, 1000 is better. Change it before you store the bike and again when you get it out. I know there are no miles on it but show me where changing it will hurt. (For dedicated storage oil, any cheap 10W40 will do, its only going to run enough in the spring to warm up for the change)
Keep the air filter clean. Every oil change, wash the sponge element and re oil (first gen Rebels) Keep the air filter clean on your second gen.
Drain the "puke" tube. Drain it every oil change. Drain it more when riding in wet weather or at prolonged high speeds.
Replace the spark plugs. Every year at spring is a good time. I went to the CR7HS cooler plugs because most of my time was on freeway and highway runs. Never went back when the riding type changed.
Check the oil often. Keep it topped up. Check it when you start for the day, when you fill the gas and at the end of the day.
Did I mention to change the oil. Keep it checked and topped up too.
Check the chain. keep it clean and lubed. Adjust as needed, REPLACE with sprockets just before needed
Check/adjust the valves. 600 miles at first, then every 4000 is fine but do check. It isn't hard. Zeprider has a great video on it. Zeprider's Valve Video
Inspect tires. Keep them aired up. Keep them at about 30 psi or so.
Change the brake fluid every spring. Yes, I know the book says every other year. What will it hurt to have fresh brake fluid at the start of every season.
Lubricate pivots. All of them. Swingarm, steering head, sidestand, cables. Lubrication is good. At least every other oil change. every change is better so it becomes a habit.
Change the fork oil. Every other year
Change the oil. Did I mention to change the oil?
Check the brakes. Look at the pads and check the wear mark on the drum at every oil change. Replace when worn to the limit marks.
Clean the cycle. Sure, it helps with appearance care but it also gives you a chance to run your hand over every bit. Get the crud build up out of nooks and crannies. Check for tightness on bolts. look at cotter pins.
Fix things you find wrong. Its just too easy to say "i'll get that tomorrow/next week/next time. If you stay on top of the small repairs, the big ones never surprise you.
Charge the battery. If it sits a month, one day of charging should top it up. Don't overcharge. If you have a self shut off charger, that helps a lot but I still only put it on once a month. If it is not sealed/maintenance free, top it up with distilled water BEFORE you charge and check the level when done
Fill the tank after every ride. Keep if full to help keep out moisture. turn your petcock off when you park for the night. I go so far as to drain my carb when I park for the night.
Check your lights for operation. Replace bad bulbs.
CHANGE THE OIL. Did I mention to change the oil?
Yes, it sounds like a lot of overkill. Its not really a lot of work. It become routine and easy after a time. Would some argue that it is more than you need? Absolutely but no one will ever say don't wash the bike, grease encrusted mud and road grime are good for the paint. They won't say you are killing the engine by changing the oil more than the book says. They may say you are wasting money on oil but oil is the life's blood of the engine.
Frequent transfusions keep it fresh.
Some other bits. I like a top cylinder lubricant. Its not an absolute but I like to use it. I've always used Lubri-Gas because its a 50W paraffin base that mixes with the fuel at a rate of 1oz per four gallons. I have no scientific proof but I think that it may have helped. (My valves didn't get close to out of spec in 30K miles, then I just had to because I couldn't stand opening the cover and not doing something!)
Don't cut and hack. Generally speaking, removing bits is like unnecessary surgery. It opens wounds for little or no gain. All my electrical mods are plug in. No wires cut. Some junctions plugged in to, but all my mods could be easily removed in a day and leave no trace. Hacking exhaust and intake will not add longevity. It will most likely shorten life.
Sure, there are A few who can do it and do no harm but they are few and far between. Yes, there are a couple/handful of them here but if you are new to cycles, you aren't one of them. If long life is the goal, don't cut.
Buy a red bike. I know, and I'm only half kidding. Get the color you like. Seriously though, black shows every imperfection. The colors can hide a lot of minor age imperfections. I have black bikes, don't get me wrong, its just that every nick, every scratch shows up like a beacon in the darkness. If you want black, just know it will take that much more determination by you to keep it looking as fresh as possible.
The colors don't draw the eye that way. Mine is no where near showroom.
It has signs of age everywhere, the small chips, smatterings of rust in nooks are crannies that didn't get perfectly dried or waxed, the scratches and other signs of use. Still, in the sunlight, it looks Ok and if you don't get too close, you would think its was newer than it is