Ignition Rebuild Kit | Honda CB550 / CB750 / CB500K

Description

Ignition Rebuild Kit | Honda CB500K / CB550 / CB750

Most ignition problems on the CB500K, CB550, and CB750 come down to the same three wear parts: the contact points, the condensers, and the rusted Phillips screws holding everything together. This kit replaces all three in one purchase so you can do a complete ignition tune-up in one afternoon instead of ordering parts three times.

Why You Need This

The ignition system on the four-cylinder CB500K/CB550/CB750 is a simple mechanical points setup — two contact breakers driven off the crankshaft, two condensers, and two coils firing four plugs. Simple doesn’t mean maintenance-free. Contact points wear down, condensers fail electrically, and the original JIS Phillips mounting screws strip out after decades of weekend-mechanic attention. Any one of those failures will send you to the shop with a bike that won’t idle, won’t rev past 5,000 RPM, or won’t run on all four cylinders.

Buying the components one at a time costs more and forces you to wait on multiple orders. This kit bundles all three together so you open one box and have everything on the bench: both contact points, both condensers, and our allen-head mounting screw conversion to replace the factory Phillips screws with stainless allen bolts you can actually get a wrench on.

Specifications

Note: This kit fits the four-cylinder Honda family only. It does not fit the CB500T parallel twin, which uses a completely different ignition points assembly shared with the CB450 and CL450.

What’s in the Kit

• Contact point — cylinders 1 & 4 (left point) — OEM 30203-300-154 / 30203-300-005
• Contact point — cylinders 2 & 3 (right point) — OEM 30204-300-154 / 30204-300-005
• 2 × Ignition condensers — OEM 30250-300-154 / 30250-300-005. One per contact breaker.
• Allen-head mounting bolt kit — replaces the factory Phillips screws for points, condensers, shift plate, and base plate. OEM 93500-06012-0A, 94101-06800.

Each component is also sold individually if you only need one thing — see the “You Might Also Need” section below.

Model-Specific Notes

• CB500K (1971–1973): The four-cylinder CB500K. Not to be confused with the CB500T twin.
• CB550K (1974–1978) & CB550F (1975–1977): Same ignition system as the CB500K.
• CB750 (1976–1978 A, KA, FA models): The CB750 uses the same contact points, condensers, and mounting hardware as the CB550 family for the model years in our fitment chart.
• CB500T (parallel twin): Does NOT fit. The CB500T shares its ignition with the CB450/CL450 twin. If you have a CB500T, order the CB450/CB500T points and condenser set separately.

Installation

Difficulty: Intermediate

Tools needed: 12V test lamp (for static timing), feeler gauge (0.012″ leaf), screwdriver, and — for dynamic timing — a stroboscopic timing light.

The installation order matters. Swap the old points for new ones first, set the gap, run through static timing with a test lamp, then do a final dynamic adjustment with a strobe timing light. The condensers are a simple screw-off / screw-on swap on the outside of each breaker plate. The allen-head bolts replace the factory Phillips screws as you reassemble — once they’re in, you’ll never curse the stripped heads again.

1. Pull the spark plugs so the engine turns over easily by hand.
2. Remove the point cover on the left side of the engine at the crankshaft to expose the two contact breakers.
3. Rotate the crankshaft until the slipper on the 1-4 contact breaker sits on the highest point of the cam lobe. Swap in the new 1-4 point and set the gap to 0.012″–0.016″ (0.3–0.4 mm) with a feeler gauge.
4. Repeat for the 2-3 contact breaker on the other side of the point plate.
5. Replace both condensers while you have the point plate exposed — they mount on the back of each breaker and the old ones have almost certainly been in there longer than the bike has been running.
6. Replace the factory Phillips mounting screws with the allen-head bolts from the kit as you reassemble. Use your 5mm allen key.
7. Static-time the 1-4 side with a 12V test lamp clipped to the primary cord connection, aligning the “F” (1-4) mark with the timing mark when the lamp lights.
8. Do the same for the 2-3 side using the opposite contact breaker’s primary cord.
9. Dynamic-time with a stroboscopic timing light once the engine is warmed up. We recommend a strobe for the most accurate timing — at full advance, the timing mark should sit between the two index lines (23.5°–26.5° BTDC).

Keep your kill switch OFF between checks. If the kill switch is ON and the points happen to be closed, you’ll be running continuous current through the coils and you can cook them. The test lamp procedure is quick — only power the coils when you’re actively reading the lamp.

Advance mechanism: Before you button everything back up, pull the mechanical advance mechanism under the point plate, clean it, and re-grease it. A gummed-up advancer will throw your dynamic timing off no matter how carefully you set the static gap. A small dab of white grease on the felt wick keeps the followers lubricated after install.