Flywheels for Honda. How do I tell the difference between CDI and points style?

I recently acquired a box filled with 1980 Hobbit CDI ignition parts in the mail. I have for some time now wanted to replace my finicky points ignition on my 79 Hobbit with a more "fire and forget" style sparking system. I had never seen a CDI style flywheel and can now see that they are quite different from the older points style flywheel.
Here are the two side by side to compare the differences.

honda flywheel

flywheel side

The timing marks are identical between the two since they are both designed for the same size crank and rod.


The magnets on the CDI flywheel as other CDI types I have seen always seem to be nestled in some kind of shock resistant bedding. I'm sure there is a reason for this, like when you wrap tinfoil around your head to protect your thoughts

Flywheel inside

The points style flywheels magnets are just manhandled in place with screws and crazy glues. It would suck to be a a June bug that crawled into this window for a warm place to sleep.

cam follower

The cam followers are unique to each other as well but you can hardly call the CDI style a "cam follower" as it has has no cam lobe since it doesn't act on breaker points. The keyway clocking is different as well in each probably due to the stator coils positioning each is designed for.

cam bottom

Both still hold the flywheel in a preset height and clocking in relation to piston height via a keyway. Both cam followers will fit on any Honda PA1 or PA2 crankshaft of all the years 78 thru 83. You could use the points style cam follower with the CDI setup but you would have to leave out the keyway and figure out the timing with a strobe timing light. The CDI cam follower cannot be used on a points setup for obvious reasons.

ignition stators

Pictured here, in my opinion,are two of the best built/designed moped ignition stators of their day. Small and compact. The points style with its "coil for every function" Brake, headlight, ignition. The power on these little coils is awesome for a 6 volt rating.
The CDI two coil design with its cool duel lead wrapped light coil to serve both headlight and brakelight from the one coil.

I am now done with this Wiki page
If you have any questions about this tutorial or can suggest an improvement in this method contact me: Cheetahchrome,26847