Why the 2004 Dyna Super Glide Still Shows Up on the Block
Harley shipped the FXD for its 25th anniversary year, and it came with a Twin Cam 88B engine, the usual Softail frame with hidden rear shocks, and a front end that borrowed the Sportster-style fork and 16-inch wheel. It looked like a bobber with a bigger tank. People still talk about it, so I will say what I know about running one rather than what the brochure said. What makes it durable enough to keep showing up at bike swap meets is straightforward. The frame is rigid enough for street use but not so stiff that it fights you over cracked pavement. The Twin Cam 88B has adequate torque for two-up cruising, and the parts supply is huge because everyone keeps one alive. There are also real weaknesses. The primary drive chain wears faster than the manual suggests if you do town riding. The softail rear suspension is firm and loses compliance on bad roads. The stock 16-inch front wheel looks good but picks up road vibration that dulls highway steering feel past 75 mph. I learned the hard way that the oil filter mounting bosses on the Twin Cam 88B are aluminum and they strip if you over-torque during a quick change. The fix is a helicoil kit and a 10 foot-pound torque spec, not your full-length ratchet. That saved me from removing the engine case just to fix a filter install mistake. I also found that the stock rear brake lever pivot bolt works itself loose on any bike with vibration dampers removed. A thread-locking compound and a lighter lever bracket fixed the issue without any major work.
Here is the practical side of keeping a 2004 model running well. Start with the oil system. Change the oil every three thousand miles and replace the primary fluid at the same interval. Use SAE 30 for warm weather and a 10W-40 synthetic blend if you ride in cooler temperatures. The transmission benefits from a gear oil flush every ten thousand miles. I used AMSOIL Synthetic Motorcycle Gear Lube 75W-90 because it holds viscosity longer under heavy load. The clutch adjustment on these bikes needs to be checked monthly. The cable stretches quickly during the first two hundred miles, then the adjuster at the lever loosens on its own. Turn the barrel adjuster until you feel about a quarter inch of free play at the lever. Anything more and the plates slip. Anything less and the throw-out bearing wears out early. I prefer a bronze washer under the clevis pin to reduce cable noise. It costs almost nothing and stops the squeak that drives people crazy after a week of storage. Brakes are the weak point on these machines. The front caliper bolts seize if you do not service them annually. Remove the caliper, clean the slide pins with brake cleaner, lubricate with silicone brake grease, and reinstall. Do this before the pins lock. The rear brake is a drum, which means the shoes and wheel cylinder need attention every other year. If you ride in rain or salt, do it every year. I keep a small drum brake tool kit in my saddlebag and spend about fifteen minutes per wheel on a regular service.
Electrical gremlins are common but usually simple. The ignition switch wiring harness chafes near the frame clamp. Check for green corrosion on the connector pins. A wire brush and dielectric grease clear it up fast. The neutral switch also fails occasionally. You will see a flickering neutral light or the bike starts in gear. Replacing the switch costs around forty dollars and takes ten minutes with a socket set. That is cheaper than getting stranded or hitting a car. Fueling can be an issue. The Twin Cam 88B runs best with a steady fuel flow and clean needles. The stock carburetor jets are sized for sea level and moderate climate. If you live at altitude or in extreme heat, the mixture runs lean. I saw this on a buddy's bike after he moved from Ohio to Arizona. He got hesitation on hard acceleration and rich idling. A jet kit from Vance & Hines sorted it out within an hour. For most riders, however, keeping the air filter clean and using a fuel stabilizer over winter is enough to avoid the worst problems. Tires matter a lot on this bike. The stock setup uses a 130/90-16 front and a 150/80-16 rear. Those sizes are correct but the rubber compounds in factory tires from 2004 are hard now. Replace them with modern compounds if you ride daily. I run Dunlop D404 on both wheels because they grip better in wet conditions and the ride quality improves noticeably. A soft compound tire on a hard chrome rim will still look right, but the handling changes enough that you should test it before taking the bike on a mountain road.
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Maintenance costs add up, but they are predictable. A basic service with oil, filters, and a tune-up runs about three hundred dollars at a shop. Doing it yourself drops that to under one hundred dollars in parts. Parts availability is one of the best things about this platform. Harley, Aftermarket, and third-party suppliers all carry what you need. If you buy used, inspect the engine case seams and the frame welds for cracks. Those are the only expensive items to fix. The rest is routine wear. I do not recommend using this bike as a track day project. The suspension travel is short, the frame geometry is loose, and the brakes fade under repeated hard use. It is a cruiser built for relaxed riding and long miles. Put a decent seat on it, add some crash bars, and ride it the way it was meant to be ridden. The 2004 Harley Dyna Super Glide A Timeless Motorcycling Icon does not need to be perfect to be worth owning. It just needs someone who knows how to keep it running.
