Fire or Failure: The Hate City Guide to Ignition Systems

An engine needs three things: compression, fuel, and fire. We spend hours obsessing over carburetor jetting (fuel) and piston rings (compression), but we usually ignore the fire until we’re kicking a bike on the side of the road, sweating through our helmet.

Ignition systems are the nervous system of your motorcycle. Some are crude mechanical hammers; others are digital sorcery. At Hate City Cycles, we work on everything from 50-year-old points to modern retro-mods. Here is the no-nonsense breakdown of how they work, why they break, and when you should rip them out.

The Contenders: From Stone Age to Space Age

1. Points & Condenser (Contact Breakers)

The OG. If your bike was made before 1978, you probably have these. A mechanical cam opens a set of spring-loaded contacts, collapsing a magnetic field in the coil and sending a spark to the plug.

• The Pros: Mechanical honesty. You can physically see if they are working. If they fail in the middle of nowhere, you can usually file them clean with a matchbox striker or adjust the gap with a business card and limp home.

• The Cons: They are high maintenance. The "rubbing block" wears down, changing your timing. The contacts pit and burn. And if the condenser (the capacitor) fails, you’re dead in the water.

• Hate City Verdict: We respect them, but we don't miss them.

2. Magneto Systems

The Moped & Dirt Bike Special. Common on the Puchs and Tomos mopeds we love. It generates its own power using magnets spinning around a coil. No battery required.

• The Pros: It runs forever. You can have a dead battery (or no battery) and the bike will still kick start. Simple, brutal, effective.

• The Cons: The spark is weak at low RPM (making starting a pain). The lights dim when you idle.

• Hate City Verdict: Essential for the small-bore smoker, but dim lights are a hazard in Atlanta traffic.

3. CDI (Capacitor Discharge Ignition)

The 80s Revolution. This replaced points on most dirt bikes and some street bikes. It stores high voltage in a capacitor and dumps it all at once into the coil.

• The Pros: Massive, hot spark. Great for high-revving engines (like 2-strokes). Maintenance-free—no moving parts to wear out.

• The Cons: The "Black Box of Death." If the CDI box fails, you can’t fix it. You just have to buy a new one. Also, 40-year-old capacitors inside those sealed boxes are starting to dry out and fail.

• Hate City Verdict: Great when it works. A paperweight when it doesn't.

4. TCI (Transistor Controlled Ignition)

The Smooth Operator. Found on many late 70s/early 80s UJMs (like the later XS650s or KZ models). It’s basically "electronic points." It uses a transistor to switch the coil current.

• The Pros: Better spark duration than CDI, leading to smoother idle and cruising. Reliable.

• The Cons: It is hungry for voltage. If your battery is weak, a TCI bike often won't start, whereas a points bike might still cough to life.

• Hate City Verdict: A solid system, but prone to "igniter box" failures as they age.

5. Waste Spark System

The Efficiency Play. Not a separate "system," but a method used on almost all Japanese 4-cylinders (CB750, KZ1000). One coil fires two spark plugs at the same time—one on the compression stroke (pow!) and one on the exhaust stroke (waste).

• The Pros: Fewer coils, less wiring, less weight.

• The Cons: You are working the coils twice as hard. If one coil dies, you lose two cylinders instantly.

• Hate City Verdict: The industry standard for UJMs. Simple and effective.

6. ECU / COP (Coil-On-Plug)

The Modern Enemy. This is what runs your modern Triumph or fuel-injected bike. A computer controls everything.

• The Pros: Perfect timing, every time. incredible efficiency.

• The Cons: You need a laptop to diagnose it. You can't fix this with a pair of pliers on the side of I-285. It has no soul.

• Hate City Verdict: Fine for your daily driver, but keep it away from our vintage builds.

To Swap or Not to Swap?

This is the most common question we get: "Should I keep my points?"

The Purist Argument: Keep the points. They are original, they have a nostalgic "feel," and they force you to be in tune with your machine.

The Hate City Reality: Do you like adjusting timing every 1,500 miles? Do you enjoy hunting for high-quality condensers that are getting harder to find?

• If you are building a show bike: Keep the points.

• If you want to ride to work: UPGRADE.

Electronic ignitions (like the Dyna S) are "set and forget." You set the timing once, and it stays there forever. The idle smooths out, the cold starts get easier, and you stop fouling plugs.

The Hate City Approved Upgrade List

We don't sell junk. These are the systems we actually install in the shop because they survive.

1. Dynatek (The Dyna S)

• For: The big UJMs (Kawasaki KZ, Honda CB, Suzuki GS).

• Why: It fits right under the stock points cover. It uses the stock mechanical advance (keeping the vintage feel) but eliminates the points. It is bulletproof.

• The Grit: It’s the first thing we do to any KZ1000 that rolls through the door.

2. Charlie's Place

• For: The small Hondas (CB350, CB175, CB450).

• Why: Charlie is a legend in the Honda scene. His electronic ignitions are designed specifically to save these old twins. They are robust and fit perfectly.

• The Grit: Essential for keeping those finicky 350 twins reliable.

3. VAPE (formerly Powerdynamo)

• For: Vintage Mopeds (Puch, Tomos) and 2-Stroke Motorcycles.

• Why: This is the nuclear option. It replaces your old, weak magneto with a modern 12V generator and CDI ignition.

• The Grit: It turns a dim, flickering headlight into a flamethrower and makes the bike start on the first kick. Expensive, but worth every penny.

4. Euro MotoElectrics (EME)

• For: BMW Airheads.

• Why: The charging and ignition systems on old BMWs are... agricultural. EME makes modern optical ignition systems and high-output charging kits that bring the Airhead into the 21st century.

• The Grit: If you plan on riding your BMW further than the coffee shop, put this on your list.

The Bottom Line

A weak spark is a slow death. It fouls plugs, wastes gas, and leaves you stranded. There is no shame in updating 50-year-old technology. We build bikes to be ridden, and if a modern ignition keeps you on the road and out of the trailer, that's a win in our book.